70 Airworthiness Directives: 60 airplane, 3 rotorcraft, 4 engine, 3 glider.
AD 98-03-06 · published Feb 2, 1998, effective Mar 9, 1998
Airbus Model A300 and A300-600 Series Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain Airbus Model A300 and A300-600 series airplanes, that requires inspections to detect cracks in Gear Rib 5 of the main landing gear (MLG) attachment fittings at the lower flange, and repair, if necessary. This amendment is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by this AD are intended to detect and correct fatigue cracking of the MLG attachment fittings, which could result in reduced structural integrity of the airplane.
AD 98-03-07 · published Feb 2, 1998, effective Mar 9, 1998
Dornier Model 328-100 Series Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain Dornier Model 328-100 series airplanes, that requires removal and replacement of the center screw of the crew seat belt buckle. This amendment is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by this AD are intended to prevent failure of the center screw of the crew seat belt buckle, which could result in injury to the flightcrew during an emergency landing.
AD 98-03-09 · published Feb 2, 1998, effective Feb 17, 1998
Boeing Model 737-100, -200, -300, -400, and -500 Series Airplanes
This amendment supersedes an existing airworthiness directive (AD), applicable to all Boeing Model 737-100, -200, -300, -400, and - 500 series airplanes, that currently requires a one-time inspection to determine if certain ailerons are installed on the airplane. That amendment also requires removing any defective aileron, and replacing it with a new or serviceable aileron. This amendment continues to require those actions and limits the applicability of the rule. This amendment is prompted by additional information that specifies the identification of certain part numbers. The actions specified in this AD are intended to detect and correct defective ailerons, which could result in in-flight separation of an aileron from the airplane and consequent reduced controllability of the airplane.
AD 98-03-10 · published Feb 4, 1998, effective Feb 19, 1998
Boeing Model 737, 747, 757, and 767 Series Airplanes
This amendment supersedes an existing airworthiness directive (AD), applicable to certain Boeing Model 737, 747, 757, and 767 series airplanes, that currently requires a one-time operational test of the pilots' seat locks and the seat tracks to ensure that the seats lock in position and the seat tracks are aligned correctly; and re-alignment of the seat tracks, if necessary. This amendment revises the applicability of the existing AD. The actions specified in this AD are intended to prevent uncommanded movement of the pilots' seats during acceleration and take-off of the airplane, and consequent reduced controllability of the airplane.
AD 98-02-05 · published Feb 5, 1998, effective Feb 23, 1998
Cessna Aircraft Company Model 172R Airplanes
This document publishes in the Federal Register an amendment adopting Airworthiness Directive (AD) 98-02-05, which was sent previously to all known U.S. owners and operators of Cessna Aircraft Company (Cessna) Model 172R airplanes. This AD requires de-activating the cabin heating system until the engine exhaust muffler can be replaced, and fabricating and installing a placard within the pilot's clear view, using \1/8\-inch letters with the following words: ``CABIN HEATER INOPERATIVE.'' Inadequate or failed weldments that are leaking exhaust gas (including carbon monoxide) from the muffler into the airplane's cabin and cockpit area prompted this action. The actions specified by this AD are intended to prevent carbon monoxide gas from entering the airplane's cabin heating system and cabin, which, if not corrected, could result in passenger and pilot injury with consequent loss of control of the airplane.
AD 98-03-08 · published Feb 5, 1998, effective Feb 20, 1998
Fokker Model F27 Mark 050 Series Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain Fokker Model F27 Mark 050 series airplanes. This action requires modification of the window frames surrounding the windshield windows and installation of reinforcement plates on all window frames of the flight compartment. For certain airplanes, this action requires modification of the window frames surrounding the sliding windows and direct vision windows of the flight compartment. This amendment is prompted by the issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified in this AD are intended to prevent structural degradation of the window frames of the flight compartment, which could result in depressurization of the airplane during flight.
AD 98-03-11 · published Feb 5, 1998, effective Mar 12, 1998
Airbus Model A300, A310, and A300-600 Series Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to all Airbus Model A300, A310, and A300-600 series airplanes. For certain airplanes, this amendment requires replacing the bearings of the throttle control levers with new sealed bearings. For certain other airplanes, this amendment requires replacing the throttle control assemblies with new assemblies. This amendment is prompted by the issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by this AD are intended to prevent asymmetric engine thrust on the airplane when the autothrottle is engaged, which could result in roll and yaw disturbances, and consequent reduced controllability of the airplane.
AD 98-03-12 · published Feb 5, 1998, effective Mar 12, 1998
Dornier Model 328-100 Series Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to all Dornier Model 328-100 series airplanes, that requires a one-time inspection of the date stamp affixed to the wing deicing boots to determine the cure date, and replacement of the deicing boot with a new boot, if necessary. This amendment is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by this AD are intended to prevent delamination of the wing deicing boots, and resultant inflation of the deicing boots to a distorted aerodynamic shape during flight, which could result in reduced controllability of the airplane.
AD 98-03-13 · published Feb 5, 1998, effective Mar 12, 1998
Short Brothers Model SD3-60 SHERPA and SD3 SHERPA Series Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to all Short Brothers Model SD3-60 SHERPA and SD3 SHERPA series airplanes, that requires removing the aluminum alloy oxygen pipe assembly and replacing it with a stainless steel assembly. This amendment is prompted by the issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by this AD are intended to prevent aluminum oxygen tubing from bursting and releasing a high- pressure oxygen flow into the passenger cabin, which could result in a fire hazard during flight.
AD 98-03-14 · published Feb 5, 1998, effective Mar 16, 1998
EXTRA Flugzeugbau GmbH Models EA-300 and EA-300/S Airplanes
This amendment adopts a new airworthiness directive (AD) that applies to EXTRA Flugzeugbau GmbH Models EA-300 and EA-300/S airplanes. This AD requires inspecting the upper longeron cutout bridge for cracks, repairing any cracks found, and modifying this area. This AD is the result of mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for Germany. The actions specified by this AD are intended to prevent structural damage to the fuselage caused by cracks in the upper longeron cutout bridge, which, if not detected and corrected, could result in loss of control of the airplane.
AD 98-03-17 · published Feb 6, 1998, effective Feb 23, 1998
British Aerospace Model HS 748 Series Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to all British Aerospace Model HS 748 series airplanes. This action requires repetitive inspections to detect discrepancies of the gust locks of the flight control system, re-rigging of the gust lock system; and corrective action, if necessary. This amendment is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified in this AD are intended to detect and correct failure of the flight control gust lock system, which could result in reduced controllability of the airplane.
AD 98-03-18 · published Feb 6, 1998, effective Mar 23, 1998
Fokker Model F28 Mark 0100 and 0070 Series Airplanes
This amendment supersedes an existing airworthiness directive (AD), applicable to all Fokker Model F28 Mark 0100 and 0070 series airplanes, that currently requires revising the Airplane Flight Manual (AFM) to include information that will enable the flightcrew to identify failures of the emergency direct current (DC)/alternating current (AC) bus power supply and to take appropriate corrective actions. This amendment requires a new terminating modification for the existing AFM revisions. This amendment also requires a new AFM revision to inform the flightcrew that, under certain conditions, an ``EMER DC BUS'' warning on the multi-function display unit (MFDU) will occur, and to take appropriate corrective actions. This amendment is prompted by the issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by this AD are intended to prevent failures of the emergency DC/AC bus power supply, which could reduce the ability of the flightcrew to control the airplane.
AD 98-04-01 · published Feb 10, 1998, effective Mar 24, 1998
EXTRA Flugzeugbau GmbH Model EA-300/S Airplanes
This amendment adopts a new airworthiness directive (AD) that applies to certain EXTRA Flugzeugbau GmbH Model EA-300/S airplanes. This AD requires modifying the canopy latches or replacing the canopy latches with parts of improved design. This AD is the result of mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for Germany. The actions specified by this AD are intended to prevent failure of the canopy while the airplane is in flight because of cracked canopy latches, which could result in loss of the canopy and possible loss of control of the airplane.
AD 98-04-02 · published Feb 10, 1998, effective Mar 24, 1998
HOAC Austria Model DV 20 Katana Airplanes
This amendment adopts a new airworthiness directive (AD) that applies to HOAC Austria Model DV 20 Katana airplanes. This AD requires replacing the nose wheel leg of the nose landing gear (NLG) with a part of improved design. This AD is the result of mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for Austria. The actions specified by this AD are intended to prevent NLG collapse caused by cracks in the welding of the nose wheel tappet of the NLG, which could result in the inability to control the airplane during landing, takeoff, and other ground operations.
AD 98-04-03 · published Feb 10, 1998, effective Mar 24, 1998
SOCATA-Groupe AEROSPATIALE Models TB9, TB10, TB20, TB21, and TB200 Airplanes
This amendment adopts a new airworthiness directive (AD) that applies to certain Socata-Groupe Aerospatiale (Socata) Models TB9, TB10, TB20, TB21, and TB200 airplanes. This AD requires inspecting the bolts and spacers of the upper attachments of the front belts for cracks, dents, etc. (damage); replacing any damaged bolts or spacers; incorporating a front belts upper attachment reinforcement kit; and reconditioning the belts. This AD is the result of mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for France. The actions specified by this AD are intended to prevent failure of the upper seat belt attachment caused by excessive loads on the upper attachment of the belt, which could result in bodily injury to the occupants during landing.
AD 98-04-04 · published Feb 10, 1998, effective Mar 24, 1998
SOCATA-Groupe AEROSPATIALE Model TBM 700 Airplanes
This amendment adopts a new airworthiness directive (AD) that applies to certain SOCATA-Groupe AEROSPATIALE (Socata) Model TBM 700 airplanes. This AD requires replacing the starter generator mounting adapter with a part of improved design. This AD is the result of mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for France. The actions specified by this AD are intended to prevent loss of the starter generator caused by failure of the starter generator mounting adapter, which could result in loss of electrical power.
AD 98-04-06 · published Feb 10, 1998, effective Feb 25, 1998
Dornier Model 328-100 Series Airplanes
This amendment adopts a new airworthiness directive (AD) that is applicable to all Dornier Model 328-100 series airplanes. This action requires repetitive visual inspections for signs of fuel leakage of the outer wing beginning with Rib 21 and continuing outward, and corrective action, if necessary. This amendment is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified in this AD are intended to prevent fuel leakage on the outboard wing, which could result in a fuel explosion and fire.
AD 98-04-07 · published Feb 10, 1998, effective Feb 25, 1998
McDonnell Douglas Model DC-9 and DC-9- 80 Series Airplanes, and C-9 (Military) Series Airplanes
This amendment supersedes an existing airworthiness directive (AD), applicable to certain McDonnell Douglas Model DC-9 and C-9 (military) series airplanes, that currently requires eddy current or dye penetrant inspection for cracks in the upper fuselage skin in the area of the aft pressure bulkhead tee. This amendment requires new improved repetitive inspections and follow-on actions, and expands the applicability of the existing AD to include additional airplanes. This amendment is prompted by additional reports of fatigue cracking and improperly seated attachments in the upper fuselage skin in the area of the aft pressure bulkhead tee. The actions specified in this AD are intended to detect and correct such fatigue cracking, which could result in rapid decompression of the fuselage and consequent reduced structural integrity of the airplane.
AD 98-03-16 · published Feb 11, 1998, effective Mar 16, 1998
The New Piper Aircraft Corporation Model PA-38-112 Airplanes
This amendment adopts a new airworthiness directive (AD) that applies to The New Piper Aircraft Corporation (Piper) Model PA-38-112 airplanes. This action requires repetitively replacing the upper rudder hinge bracket. Reports of fatigue cracks occurring on the upper rudder hinge bracket, and the manufacture of a new upper rudder hinge bracket with a life limited improved design prompted this action. The actions specified by this AD are intended to prevent cracks in the upper rudder hinge bracket, which could result in separation of the rudder from the airplane and loss of control of the airplane.
AD 98-03-19 · published Feb 11, 1998, effective Mar 18, 1998
Empresa Brasileira de Aeronautica, S.A. (EMBRAER), Model EMB-120 Series Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain EMBRAER Model EMB-120 series airplanes, that requires deactivation of certain circuit breakers, and a revision to the Airplane Flight Manual (AFM) to provide operational procedures to prevent loss of electrical power following an engine flameout. This AD also requires modifications of the electrical system, which terminate the requirement for the AFM revision and allow reactivation of the circuit breakers. This amendment is prompted by the issuance of mandatory continued airworthiness information by a foreign civil airworthiness authority. The actions specified by this AD are intended to prevent generator overload conditions that could result in loss of electrical power and failure of certain flight and landing control systems, and to prevent power interruption to the attitude heading reference system (AHRS) that could result in the display of erroneous heading information.
AD 98-03-20 · published Feb 11, 1998, effective Mar 18, 1998
Boeing Model 757 Series Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 757 series airplanes, that requires one-time inspections to verify proper installation and to detect chafing and/or damage of certain rerouted wire bundles; to verify if certain protective grommets are installed properly and to detect missing grommets; and various follow-on actions. This amendment is prompted by a report of smoke and fire in the lower left-hand side of the E1-1 rack of the electrical equipment bay due to chafing of wire bundles as a result of missing protective grommets. The actions specified by this AD are intended to prevent chafing of wire bundles, which could result in smoke and fire at the E1-1 rack of the electrical equipment bay.
AD 98-04-09 · published Feb 11, 1998, effective Mar 18, 1998
Fokker Model F28 Mark 0070 and Mark 0100 Series Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to all Fokker Model F28 Mark 0070 and Mark 0100 series airplanes, that requires a one-time visual inspection to detect cracking of the brake torque tube lever, and corrective action, if necessary. This amendment is prompted by the issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by this AD are intended to prevent failure of the brake torque tube lever, which could result in a disconnection between the brake pedal and brake system, and consequent reduced directional controllability of the airplane during landing.
AD 88-04-05 · published Feb 16, 1998, effective Feb 16, 1988
Piper Aircraft Inc. Airplanes
AD 98-04-05 · published Feb 17, 1998, effective Mar 10, 1998
Fairchild Aircraft Incorporated Models SA226-TC, SA226-T, SA226-T(B), and SA226-AT Airplanes
This amendment adopts a new airworthiness directive (AD) that applies to certain Fairchild Aircraft Incorporated (Fairchild) Models SA226-TC, SA226-T, SA226-T(B), and SA226-AT airplanes. This action requires inspecting the center flap hinge and wing trailing edge ribs at the flap actuator attach brackets for cracks and if no cracks are found, installing a doubler on the rib, or replacing a cracked rib with a new rib assembly that is reinforced with a doubler. This action is the result of high local stress concentration, which led to fatigue cracking of the wing trailing edge ribs. The actions specified by this AD are intended to prevent asymmetrical flap deflection, which could force the airplane into an uncommanded roll with possible loss of control of the airplane.
AD 98-04-08 · published Feb 17, 1998, effective Mar 4, 1998
Bombardier Model CL-215-1A10 and CL- 215-6B11 Series Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain Bombardier Model CL-215-1A10 and CL-215-6B11 series airplanes. This action requires repetitive ultrasonic inspections to detect cracking of the lower caps of the wing front spar and rear spar, and corrective action, if necessary. This amendment is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified in this AD are intended to detect and correct cracking of the lower caps of the wing front spar and rear spar, which could result in reduced structural integrity of the airplane.
AD 98-04-10 · published Feb 17, 1998, effective Mar 24, 1998
Airbus Model A300 and A300-600 Series Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to all Airbus Model A300 and A300-600 series airplanes, that requires repetitive inspections for cracking of the lugs of hinge brackets of inner airbrakes (spoilers) No. 1 and No. 2, and corrective action, if necessary. This amendment is prompted by the issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by this AD are intended to prevent detachment of the spoilers and consequent reduced controllability of the airplane.
AD 98-04-11 · published Feb 17, 1998, effective Mar 24, 1998
Airbus Model A320 and A321 Series Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain Airbus Model A320 and A321 series airplanes, that requires activation of a spoiler function that allows partial ground spoiler activation with only one main landing gear compressed. This amendment is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by this AD are intended to prevent possible delays in deceleration when landing with strong cross winds and/or on a contaminated runway, which could increase the potential for landing overrun.
AD 98-04-16 · published Feb 17, 1998, effective Apr 2, 1998
Pilatus Aircraft Ltd. Models PC-12 and PC-12/45 Airplanes
This amendment adopts a new airworthiness directive (AD) that applies to certain Pilatus Aircraft Ltd. (Pilatus) Models PC-12 and PC- 12/45 airplanes. This AD requires inspecting the aileron tie-rod jam nuts for looseness, tightening any loose jam nuts, and installing a locking sleeve on both ends of the aileron tie-rod in the chain-drive of the aileron system. The AD results from an incident where the aileron tie-rod jam nuts on the chain-drive of the aileron system became loose. This caused a differential of aileron control between the pilot's control wheel and the co-pilot's control wheel. The actions specified by this AD are intended to prevent such aileron control differential caused by the aileron tie-rod jam nuts becoming loose, which could result in loss of aileron control and consequent loss of control of the airplane.
AD 98-04-17 · published Feb 17, 1998, effective Mar 23, 1998
B-N Group Ltd. Airplanes
This amendment supersedes Airworthiness Directive (AD) 97-03-03, which applies to certain Pilatus Britten-Norman Ltd. (Pilatus) BN-2, BN-2A, and BN-2B series airplanes that do not have Modification NB/M/1571 generator terminal diodes installed. AD 97-03-03 currently requires the installation of higher capacity diodes on the generator switches regardless of whether the airplane is equipped with the original 50 amp DC generating system or a Modification NB/M/1148, which is a 70 amp system. This action retains the actions of AD 97-03-03, but modifies the applicability section to reflect that this AD does not apply to Pilatus BN-2, BN-2A, and BN-2B series airplanes with 50 amp DC generation systems installed. This AD is the result of reports that the applicability section of AD 97-03-03 is incorrect. The actions specified by this AD are intended to prevent a loss of electrical power to the navigation, communications, and lighting systems, which could impair the pilot's ability to maintain control of the airplane. The incorporation by reference of Pilatus Britten-Norman Manufacturers Service Bulletin (SB) BN-2/SB.228, Issue 2, dated January 17, 1996, as listed in the regulations was previously approved by the Director of the Federal Register as of March 23, 1997 (62 FR 4909, February 3, 1997).
AD 98-04-18 · published Feb 17, 1998, effective Mar 13, 1998
AeroSpace Technologies of Australia Pty Ltd. Models N22B and N24A Airplanes
This amendment adopts a new airworthiness directive (AD) that applies to certain AeroSpace Technologies of Australia (ASTA) Models N22B and N24A airplanes. This action requires revising the FAA-approved airplane flight manual (AFM) to specify procedures that will prohibit flight in severe icing conditions (as determined by certain visual cues), limit or prohibit the use of various flight control devices while in severe icing conditions, and provide the flight crew with recognition cues for, and procedures for exiting from, severe icing conditions. This AD is prompted by results of a review of the requirements for certification of these airplanes in icing conditions, new information on the icing environment, and icing data provided currently to the flight crew. The actions specified by this AD are intended to minimize the potential hazards associated with operating these airplanes in severe icing conditions by providing more clearly defined procedures and limitations associated with such conditions.
AD 98-04-19 · published Feb 17, 1998, effective Mar 13, 1998
Harbin Aircraft Manufacturing Corporation Model Y12 IV Airplanes
This amendment adopts a new airworthiness directive (AD) that applies to certain Harbin Aircraft Manufacturing Corporation (HMAC) Model Y12 IV airplanes. This action requires revising the FAA-approved Airplane Flight Manual (AFM) to specify procedures that would prohibit flight in severe icing conditions (as determined by certain visual cues), limit or prohibit the use of various flight control devices while in severe icing conditions, and provide the flight crew with recognition cues for, and procedures for exiting from, severe icing conditions. This AD is prompted by the results of a review of the requirements for certification of these airplanes in icing conditions, new information on the icing environment, and icing data provided currently to the flight crew. The actions specified by this AD are intended to minimize the potential hazards associated with operating these airplanes in severe icing conditions by providing more clearly defined procedures and limitations associated with such conditions.
AD 98-04-20 · published Feb 17, 1998, effective Mar 13, 1998
Partenavia Costruzioni Aeronauticas, S.p.A. Model P68, AP68TP 300, AP68TP 600 Airplanes
This amendment adopts a new airworthiness directive (AD) that applies to Partenavia Costruzioni Aeronauticas, S.p.A. Model P68, AP68TP 300, AP68TP 600 airplanes. This action requires revising the FAA-approved Airplane Flight Manual (AFM) to specify procedures that would prohibit flight in severe icing conditions (as determined by certain visual cues), limit or prohibit the use of various flight control devices while in severe icing conditions, and provide the flight crew with recognition cues for, and procedures for exiting from, severe icing conditions. This AD is prompted by the results of a review of the requirements for certification of these airplanes in icing conditions, new information on the icing environment, and icing data provided currently to the flight crew. The actions specified by this AD are intended to minimize the potential hazards associated with operating these airplanes in severe icing conditions by providing more clearly defined procedures and limitations associated with such conditions.
AD 98-04-21 · published Feb 17, 1998, effective Mar 13, 1998
Pilatus Britten-Norman Limited Models BN-2A, BN-2B, and BN-2T Airplanes
This amendment adopts a new airworthiness directive (AD) that applies to Pilatus Britten-Norman Limited BN-2A, BN-2B, and BN-2T Series airplanes. This action requires revising the FAA-approved Airplane Flight Manual (AFM) to specify procedures that would prohibit flight in severe icing conditions (as determined by certain visual cues), limit or prohibit the use of various flight control devices while in severe icing conditions, and provide the flight crew with recognition cues for, and procedures for exiting from, severe icing conditions. This AD is prompted by the results of a review of the requirements for certification of these airplanes in icing conditions, new information on the icing environment, and icing data provided currently to the flight crew. The actions specified by this AD are intended to minimize the potential hazards associated with operating these airplanes in severe icing conditions by providing more clearly defined procedures and limitations associated with such conditions.
AD 98-04-22 · published Feb 17, 1998, effective Mar 13, 1998
SOCATAGroupe AEROSPATIALE, Model TBM 700 Airplanes
This amendment adopts a new airworthiness directive (AD) that applies to SOCATA--Groupe AEROSPATIALE, Model TBM 700 airplanes. This action requires revising the FAA-approved Airplane Flight Manual (AFM) to specify procedures that would prohibit flight in severe icing conditions (as determined by certain visual cues), limit or prohibit the use of various flight control devices while in severe icing conditions, and provide the flight crew with recognition cues for, and procedures for exiting from, severe icing conditions. This AD is prompted by the results of a review of the requirements for certification of these airplanes in icing conditions, new information on the icing environment, and icing data provided currently to the flight crew. The actions specified by this AD are intended to minimize the potential hazards associated with operating these airplanes in severe icing conditions by providing more clearly defined procedures and limitations associated with such conditions.
AD 98-04-23 · published Feb 17, 1998, effective Mar 13, 1998
Aerostar Aircraft Corporation Models PA-60-600, PA-60-601, PA-60-601P, PA-60-602P, and PA-60-700P Airplanes
This amendment adopts a new airworthiness directive (AD) that applies to Aerostar Aircraft Corporation Models PA-60-600, PA-60-601, PA-60-601P, PA-60-602P, and PA-60-700P airplanes. This action requires revising the FAA-approved Airplane Flight Manual (AFM) to specify procedures that would prohibit flight in severe icing conditions (as determined by certain visual cues), limit or prohibit the use of various flight control devices while in severe icing conditions, and provide the flight crew with recognition cues for, and procedures for exiting from, severe icing conditions. This AD is prompted by the results of a review of the requirements for certification of these airplanes in icing conditions, new information on the icing environment, and icing data provided currently to the flight crew. The actions specified by this AD are intended to minimize the potential hazards associated with operating these airplanes in severe icing conditions by providing more clearly defined procedures and limitations associated with such conditions.
AD 98-04-24 · published Feb 17, 1998, effective Mar 13, 1998
Raytheon Aircraft Company Models E55, E55A, 58, 58A, 58P, 58PA, 58TC, 58TCA Airplanes, and 60, 65-B80, 65- B90, 90, F90, 100, 300, and B300 Series Airplanes
This amendment adopts a new airworthiness directive (AD) that applies to Raytheon Aircraft Company Models E55, E55A, 58, 58A, 58P, 58PA, 58TC, 58TCA airplanes, and 60, 65-B80, 65-B90, 90, F90, 100, 300, and B300 series airplanes. This action requires revising the FAA- approved Airplane Flight Manual (AFM) to specify procedures that would prohibit flight in severe icing conditions (as determined by certain visual cues), limit or prohibit the use of various flight control devices while in severe icing conditions, and provide the flight crew with recognition cues for, and procedures for exiting from, severe icing conditions. This AD is prompted by the results of a review of the requirements for certification of these airplanes in icing conditions, new information on the icing environment, and icing data provided currently to the flight crew. The actions specified by this AD are intended to minimize the potential hazards associated with operating these airplanes in severe icing conditions by providing more clearly defined procedures and limitations associated with such conditions.
AD 98-04-25 · published Feb 17, 1998, effective Mar 13, 1998
Raytheon Aircraft Company Model 2000 Airplanes
This amendment adopts a new airworthiness directive (AD) that applies to Raytheon Aircraft Company Model 2000 airplanes. This action requires revising the FAA-approved Airplane Flight Manual (AFM) to specify procedures that would prohibit flight in severe icing conditions (as determined by certain visual cues), limit or prohibit the use of various flight control devices while in severe icing conditions, and provide the flight crew with recognition cues for, and procedures for exiting from, severe icing conditions. This AD is prompted by the results of a review of the requirements for certification of these airplanes in icing conditions, new information on the icing environment, and icing data provided currently to the flight crew. The actions specified by this AD are intended to minimize the potential hazards associated with operating these airplanes in severe icing conditions by providing more clearly defined procedures and limitations associated with such conditions.
AD 98-04-26 · published Feb 17, 1998, effective Mar 13, 1998
The New Piper Aircraft Corporation Models PA-46-310P and PA-46-350P Airplanes
This amendment adopts a new airworthiness directive (AD) that applies to The New Piper Aircraft Corporation Models PA-46-310P and PA- 46-350P airplanes. This action requires revising the FAA-approved Airplane Flight Manual (AFM) to specify procedures that would prohibit flight in severe icing conditions (as determined by certain visual cues), limit or prohibit the use of various flight control devices while in severe icing conditions, and provide the flight crew with recognition cues for, and procedures for exiting from, severe icing conditions. This AD is prompted by the results of a review of the requirements for certification of these airplanes in icing conditions, new information on the icing environment, and icing data provided currently to the flight crew. The actions specified by this AD are intended to prevent minimize the potential hazards associated with operating these airplanes in severe icing conditions by providing more clearly defined procedures and limitations associated with such conditions.
AD 98-04-27 · published Feb 17, 1998, effective Mar 13, 1998
The New Piper Aircraft Corporation Models PA-23, PA-23-160, PA-23-235, PA-23-250, PA-E23-250, PA-30, PA- 39, PA-40, PA-31, PA-31-300, PA-31-325, PA-31-350, PA-34-200, PA-34- 200T, PA-34-220T, PA-42, PA-42-720, PA-42-1000 Airplanes
This amendment adopts a new airworthiness directive (AD) that applies to The New Piper Aircraft Corporation (Piper) Models PA-23, PA- 23-160, PA-23-235, PA-23-250, PA-E23-250, PA-30, PA-39, PA-40, PA-31, PA-31-300, PA-31-325, PA-31-350, PA-34-200, PA-34-200T, PA-34-220T, PA- 42, PA-42-720, PA-42-1000 airplanes. This action requires revising the FAA-approved airplane flight manual (AFM) to specify procedures that will prohibit flight in severe icing conditions (as determined by certain visual cues), limit or prohibit the use of various flight control devices while in severe icing conditions, and provide the flight crew with recognition cues for, and procedures for exiting from, severe icing conditions. This AD is prompted by results of a review of the requirements for certification of these airplanes in icing conditions, new information on the icing environment, and icing data provided currently to the flight crew. The actions specified by this AD are intended to minimize the potential hazards associated with operating these airplanes in severe icing conditions by providing more clearly defined procedures and limitations associated with such conditions.
AD 98-04-28 · published Feb 17, 1998, effective Mar 13, 1998
Cessna Aircraft Company Models T303, 310R, T310R, 335, 340A, 402B, 402C, 404, F406, 414, 414A, 421B, 421C, 425, and 441 Airplanes
This amendment adopts a new airworthiness directive (AD) that applies to Cessna Aircraft Company Models T303, 310R, T310R, 335, 340A, 402B, 402C, 404, F406, 414, 414A, 421B, 421C, 425, and 441 airplanes. This action requires revising the FAA-approved Airplane Flight Manual (AFM) to specify procedures that would prohibit flight in severe icing conditions (as determined by certain visual cues), limit or prohibit the use of various flight control devices while in severe icing conditions, and provide the flight crew with recognition cues for, and procedures for exiting from, severe icing conditions. The proposed AD is prompted by the results of a review of the requirements for certification of these airplanes in icing conditions, new information on the icing environment, and icing data provided currently to the flight crew. The actions specified by this AD are intended to minimize the potential hazards associated with operating these airplanes in severe icing conditions by providing more clearly defined procedures and limitations associated with such conditions.
AD 98-04-29 · published Feb 17, 1998, effective Mar 24, 1998
Boeing Model 727 Series Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to all Boeing Model 727 series airplanes, that requires a one-time visual inspection of the manual extension gearbox assembly of the main landing gear (MLG) to detect whether certain gearbox housings have been installed; repetitive dye penetrant inspections of these housings to determine whether cracking has occurred; and ultimately, replacement of these housings with correct housings. This amendment is prompted by a report indicating that a manual gearbox assembly which contained an incorrect housing was installed on a Model 727 series airplane. The actions specified by this AD are intended to detect the installation of manual extension gearbox assemblies with incorrect housings. This condition, if not corrected, could reduce the structural integrity of the manual extension gearbox assembly, and ultimately result in an inability to lock the MLG in a down position during landing.
AD 98-04-31 · published Feb 18, 1998, effective Mar 25, 1998
Fairchild Model F27 and FH227 Series Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to all Fairchild Model F27 and FH227 series airplanes, that requires revising the Airplane Flight Manual (AFM) to specify procedures that would prohibit flight in severe icing conditions (as determined by certain visual cues), limit or prohibit the use of various flight control devices while in severe icing conditions, and provide the flight crew with recognition cues for, and procedures for exiting from, severe icing conditions. This amendment is prompted by results of a review of the requirements for certification of the airplane in icing conditions, new information on the icing environment, and icing data provided currently to the flight crews. The actions specified by this AD are intended to minimize the potential hazards associated with operating the airplane in severe icing conditions by providing more clearly defined procedures and limitations associated with such conditions.
AD 98-04-32 · published Feb 18, 1998, effective Mar 25, 1998
Lockheed Model L-14 and L-18 Series Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to all Lockheed Model L-14 and L-18 Series Airplanes, that requires revising the Airplane Flight Manual (AFM) to specify procedures that would prohibit flight in severe icing conditions (as determined by certain visual cues), limit or prohibit the use of various flight control devices while in severe icing conditions, and provide the flight crew with recognition cues for, and procedures for exiting from, severe icing conditions. This amendment is prompted by results of a review of the requirements for certification of the airplane in icing conditions, new information on the icing environment, and icing data provided currently to the flight crews. The actions specified by this AD are intended to minimize the potential hazards associated with operating the airplane in severe icing conditions by providing more clearly defined procedures and limitations associated with such conditions.
AD 98-04-33 · published Feb 18, 1998, effective Mar 25, 1998
Gulfstream American (Frakes Aviation) Model G-73 (Mallard) and G-73T Series Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to all Gulfstream American (Frakes Aviation) Model G-73 (Mallard) and G-73T series airplanes, that requires revising the Airplane Flight Manual (AFM) to specify procedures that would prohibit flight in severe icing conditions (as determined by certain visual cues), limit or prohibit the use of various flight control devices while in severe icing conditions, and provide the flight crew with recognition cues for, and procedures for exiting from, severe icing conditions. This amendment is prompted by results of a review of the requirements for certification of the airplane in icing conditions, new information on the icing environment, and icing data provided currently to the flight crews. The actions specified by this AD are intended to minimize the potential hazards associated with operating the airplane in severe icing conditions by providing more clearly defined procedures and limitations associated with such conditions.
AD 98-04-34 · published Feb 18, 1998, effective Mar 25, 1998
Mitsubishi Model YS-11 and YS-11A Series Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to all Mitsubishi Model YS-11 and YS-11A series airplanes, that requires revising the Airplane Flight Manual (AFM) to specify procedures that will prohibit flight in severe icing conditions (as determined by certain visual cues), limit or prohibit the use of various flight control devices while in severe icing conditions, and provide the flight crew with recognition cues for, and procedures for exiting from, severe icing conditions. This amendment is prompted by results of a review of the requirements for certification of the airplane in icing conditions, new information on the icing environment, and icing data provided currently to the flight crews. The actions specified by this AD are intended to minimize the potential hazards associated with operating the airplane in severe icing conditions by providing more clearly defined procedures and limitations associated with such conditions.
AD 98-04-35 · published Feb 18, 1998, effective Mar 25, 1998
McDonnell Douglas Model DC-3 and DC-4 Series Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to all McDonnell Douglas Model DC-3 and DC-4 series airplanes, that requires revising the Airplane Flight Manual (AFM) to specify procedures that would prohibit flight in severe icing conditions (as determined by certain visual cues), limit or prohibit the use of various flight control devices while in severe icing conditions, and provide the flight crew with recognition cues for, and procedures for exiting from, severe icing conditions. This amendment is prompted by results of a review of the requirements for certification of the airplane in icing conditions, new information on the icing environment, and icing data provided currently to the flight crews. The actions specified by this AD are intended to minimize the potential hazards associated with operating the airplane in severe icing conditions by providing more clearly defined procedures and limitations associated with such conditions.
AD 98-04-36 · published Feb 18, 1998, effective Mar 25, 1998
Gulfstream Model G-159 Series Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to all Gulfstream Model G-159 series airplanes, that requires revising the Airplane Flight Manual (AFM) to specify procedures that would prohibit flight in severe icing conditions (as determined by certain visual cues), limit or prohibit the use of various flight control devices while in severe icing conditions, and provide the flight crew with recognition cues for, and procedures for exiting from, severe icing conditions. This amendment is prompted by results of a review of the requirements for certification of the airplane in icing conditions, new information on the icing environment, and icing data provided currently to the flight crews. The actions specified by this AD are intended to minimize the potential hazards associated with operating the airplane in severe icing conditions by providing more clearly defined procedures and limitations associated with such conditions.
AD 98-04-37 · published Feb 18, 1998, effective Mar 25, 1998
Sabreliner Model 40, 60, 70, and 80 Series Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain Sabreliner Model 40, 60, 70, and 80 series airplanes, that requires revising the Airplane Flight Manual (AFM) to specify procedures that would prohibit flight in severe icing conditions (as determined by certain visual cues), limit or prohibit the use of various flight control devices while in severe icing conditions, and provide the flight crew with recognition cues for, and procedures for exiting from, severe icing conditions. This amendment is prompted by results of a review of the requirements for certification of the airplane in icing conditions, new information on the icing environment, and icing data provided currently to the flight crews. The actions specified by this AD are intended to minimize the potential hazards associated with operating the airplane in severe icing conditions by providing more clearly defined procedures and limitations associated with such conditions.
AD 98-04-38 · published Feb 18, 1998, effective Mar 25, 1998
Cessna Model 500, 501, 550, 551, and 560 Series Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain Cessna Model 500, 501, 550, 551, and 560 series airplanes, that requires revising the Airplane Flight Manual (AFM) to specify procedures that would prohibit flight in severe icing conditions (as determined by certain visual cues), limit or prohibit the use of various flight control devices while in severe icing conditions, and provide the flight crew with recognition cues for, and procedures for exiting from, severe icing conditions. This amendment is prompted by results of a review of the requirements for certification of the airplane in icing conditions, new information on the icing environment, and icing data provided currently to the flight crews. The actions specified by this AD are intended to minimize the potential hazards associated with operating the airplane in severe icing conditions by providing more clearly defined procedures and limitations associated with such conditions.
AD 98-01-14 · published Feb 23, 1998, effective Feb 23, 1998
Cessna Aircraft Company Airplanes
This document publishes in the Federal Register an amendment adopting Airworthiness Directive (AD) 98-01-14, which was sent previously to all known U.S. owners and operators of Cessna Aircraft Company (Cessna) Model 182S airplanes. This AD requires replacing the left and right Aeroquip engine exhaust mufflers (P/N 71379-1254017-8) with an FAA-approved equivalent part. Reports of carbon monoxide gas entering the cabin heating system and the cabin of the Cessna Model 182S airplanes prompted this action. This condition, if not corrected, could result in passenger and pilot injury with consequent loss of control of the airplane.
AD 98-04-41 · published Feb 23, 1998, effective Mar 10, 1998
Boeing Model 737-200 and -300 Series Airplanes Equipped With a Main Deck Cargo Door Installed in Accordance With Supplemental Type Certificate SA2969SO
This amendment adopts a new airworthiness directive (AD) that is applicable to certain Boeing Model 737-200 and -300 series airplanes. This action requires repetitive inspections to detect cracks in the hinge and lift actuator box area of the main deck cargo door and upper jamb of the fuselage; and repair or replacement of any cracked part with a new part having the same part number. This amendment is prompted by a report that, during a periodic heavy maintenance check, cracks were found in the upper jamb area of the fuselage and in the main deck cargo door. The actions specified in this AD are intended to detect and correct such cracking, which could result in reduced structural integrity of the main cargo door and/or fuselage, and consequent loss or opening of the main deck cargo door while the airplane is in flight, or reduced controllability of the airplane.
AD 98-04-42 · published Feb 23, 1998, effective Mar 30, 1998
Grumman Model TS-2A Series Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to all Grumman Model TS-2A series airplanes, that requires revising the Airplane Flight Manual (AFM) to modify the limitation that prohibits positioning the power levers below the flight idle stop during flight, and to add a statement of the consequences of such positioning of the power levers. This amendment is prompted by incidents and accidents involving airplanes equipped with turboprop engines in which the ground propeller beta range was used improperly during flight. The actions specified by this AD are intended to prevent loss of airplane controllability, or engine overspeed and consequent loss of engine power, caused by the power levers being positioned below the flight idle stop when the airplane is in flight.
AD 98-02-51 · published Feb 25, 1998, effective Mar 2, 1998
Boeing Model 737-300, -400, and -500 Series Airplanes
This document publishes in the Federal Register an amendment adopting Airworthiness Directive (AD) 98-02-51 that was sent previously to all known U.S. owners and operators of Boeing Model 737-300, -400, and -500 series airplanes by individual telegrams. This AD requires a one-time general visual inspection to detect any missing fasteners on the top and bottom of the leading edge skin where it attaches to the front spar of the horizontal stabilizer. This AD also requires a one- time detailed visual inspection to detect any loose or missing fasteners of the attachment of the elevator hinge plates to the horizontal stabilizer rear spar fittings. If a loose or missing fastener is detected, this AD requires installation of a new or serviceable fastener. This action is prompted by reports of loose or missing fasteners of the leading edge structure and elevator attachment fitting of the right-hand horizontal stabilizer. The actions specified by this AD are intended to prevent reduced structural integrity of the horizontal stabilizer due to loose or missing fasteners.
AD 98-04-43 · published Feb 27, 1998, effective Apr 3, 1998
Aerospatiale Model ATR72 Series Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain Aerospatiale Model ATR72 series airplanes, that requires removal of certain landing gear attachment pins, and replacement of the pins with serviceable pins. This amendment is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by this AD are intended to prevent wear of the attachment pins, which could result in collapse of the main landing gear.
AD 98-04-44 · published Feb 27, 1998, effective Mar 16, 1998
Airbus Model A340 Series Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain Airbus Model A340 series airplanes. This action requires replacement of the groove pins on the doors of the center main landing gear (MLG) with new pins, modification of the bolt head, installation of an antirotation plate, and modification of the hinge pins on the doors of the MLG by the installation of oversize bolts. This amendment is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified in this AD are intended to prevent detachment of the center MLG door during flight, which could pose a hazard to persons or property on the ground.
AD 98-04-45 · published Feb 27, 1998, effective Apr 3, 1998
Bombardier Model CL-600-2B19 (Regional Jet Series 100) Series Airplanes
This amendment supersedes an existing airworthiness directive (AD), applicable to certain Bombardier Model CL-600-2B19 (Regional Jet Series 100) series airplanes, that currently requires revisions to the Airplane Flight Manual (AFM) to advise the flight crew of the need to perform daily checks to verify proper operation of the elevator control system, and to restrict altitude and airspeed operations under certain conditions. That AD also requires removal of all elevator flutter dampers. That AD was prompted by reports that the installation of certain shear pins may jam or restrict movement of the elevator. The actions specified by that AD are intended to prevent such jamming or restricting movement of the elevator and the resultant adverse effect on the controllability of the airplane. This amendment adds inspections of certain airplanes to detect deformation or discrepancies of the flutter damper hinge fittings and lug of the horizontal stabilizer, the elevator hinge/damper fitting, and the shear pin lugs; and requires replacement of discrepant parts with serviceable parts. This amendment also requires installation of new elevator flutter dampers, and replacement of shear pins and shear links with new, improved pins and links.
AD 98-04-47 · published Feb 27, 1998, effective Apr 3, 1998
SOCATAGroupe AEROSPATIALE Models TB9, TB10, and TB200 Airplanes
This amendment adopts a new airworthiness directive (AD) that applies to certain SOCATA--Groupe AEROSPATIALE (Socata) Models TB9, TB10, and TB200 airplanes. This AD requires inspecting the main landing gear (MLG) support ribs for cracks, replacing MLG support ribs that have cracks beyond a certain level, and incorporating a certain MLG support rib reinforcement kit. This AD is the result of mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for France. The actions specified by this AD are intended to prevent MLG failure caused by cracks in the support ribs, which could result in loss of control of the airplane during landing operations.
AD 98-04-49 · published Feb 27, 1998, effective Apr 3, 1998
Airbus Model A320-111, -211, -212, - 214, -231, -232, and -233 Series Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to all Airbus Model A320-111, -211, -212, -214, -231, -232, and -233 series airplanes, that requires repetitive ultrasonic inspections to detect fatigue cracking in the wing/fuselage joint cruciform fittings, and corrective actions, if necessary. This amendment is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by this AD are intended to detect and correct fatigue cracks on the wing/fuselage joint cruciform fittings, which could result in reduced structural integrity of the wing/fuselage.
AD 98-04-50 · published Feb 27, 1998, effective Apr 3, 1998
Fokker Model F.28 Mark 0070 and F.28 Mark 0100 Series Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to all Fokker Model F.28 Mark 0070 and F.28 Mark 0100 series airplanes, that requires modification of the wing leading edge torsion box. This amendment is prompted by the issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by this AD are intended to prevent a possible ignition hazard due to accumulation of water and fuel between the front spar and auxiliary spar, which could result in increased risk of an in- flight fire.
AD 98-05-02 · published Feb 27, 1998, effective Mar 16, 1998
Cessna Model 750 Airplanes
This amendment adopts a new airworthiness directive (AD) that is applicable to certain Cessna Model 750 airplanes. This action requires repetitive lubrication of the aileron feel cartridge assembly shaft. This action also requires replacement of the roll feel and centering bungee assembly with an improved assembly, which constitutes terminating action for the repetitive lubrication. This amendment is prompted by reports of partial to full jamming of the aileron control circuit during flight of the airplane. The actions specified in this AD are intended to prevent the possibility of accumulation of ice on the aileron feel cartridge assembly shaft, which could result in jamming of the aileron control circuit, and consequent reduced controllability of the airplane.
AD 97-15-15 · published Feb 6, 1998, effective Feb 23, 1998
Eurocopter France Model SA-365N, SA- 365N1, and SA-366G1 Helicopters
This document publishes in the Federal Register an amendment adopting Airworthiness Directive (AD) 97-15-15, which was sent previously to all known U.S. owners and operators of Eurocopter France Model SA-365N, SA-365N1, and SA-366G1 helicopters by individual letters. This AD requires an inspection of the main gearbox magnetic plug (magnetic plug) and the main gearbox oil filter (oil filter) for ferrous chips; vibration measurements, if necessary; and replacement of the main gearbox if a specified quantity of ferrous chips are discovered, or if abnormal vibrations are identified at a certain frequency. This amendment is prompted by two recent reports of cracks found in planetary gear shafts (gear shafts) in main gearboxes that have not been modified in accordance with MOD 077244. The actions specified by this AD are intended to detect cracks in the gear shaft which could lead to failure of the gear shaft, failure of the transmission, and subsequent loss of control of the helicopter.
AD 98-04-48 · published Feb 25, 1998, effective Mar 12, 1998
Eurocopter France Model AS 332L2 Helicopters
This amendment adopts a new airworthiness directive (AD) that is applicable to Eurocopter France Model AS 332L2 helicopters. This action requires modifying the main rotor blade vibration absorber (vibration absorber) by replacing the weight support assemblies with reinforced weight support assemblies. This amendment is prompted by a report of the failure of a weight support assembly in-flight. The actions specified in this AD are intended to prevent failure of a vibration absorber weight support assembly, which could lead to adverse vibrations, contact between the fuselage and a main rotor blade or loss of a main rotor blade; and subsequent loss of control of the helicopter.
AD 98-05-01 · published Feb 27, 1998, effective Apr 3, 1998
Eurocopter France Model SA-366G1 Helicopters
This amendment adopts a new airworthiness directive (AD), applicable to Eurocopter France Model SA-366G1 helicopters, with certain main rotor head frequency adapters (frequency adapters) installed. This proposal requires inspecting the frequency adapter to determine if a certain frequency adapter is installed, and if so, removing and discarding the frequency adapter and replacing it with an airworthy frequency adapter before further flight. This amendment is prompted by a report of disbonding of the metal center section of a frequency adapter from the elastomer, caused by a lack of adherence during the production process. The actions specified by this AD are intended to prevent vibrations caused by disbonding of the center section of a frequency adapter from the elastomer, that could result in loss of control of the helicopter.
AD 98-04-13 · published Feb 17, 1998, effective Mar 24, 1998
Rolls-Royce Limited Dart Series Turboprop Engines
This amendment supersedes an existing airworthiness directive (AD), applicable to Rolls-Royce Limited (R-R) Dart series turboprop engines, that currently establishes a life limit for propeller low torque switches. This amendment adds two propeller low torque switch part numbers and two R-R Dart engine models that were omitted from the current AD, and establishes a calendar end-date for removal of propeller low torque switches from service. This amendment is prompted by the need to add omitted part numbers and engine models to the AD. The actions specified by this AD are intended to prevent cracking of the snap diaphragm in the propeller low torque switch, which could delay propeller auto-feathering and thereby adversely affect aircraft controllability.
AD 98-04-39 · published Feb 25, 1998, effective Feb 25, 1998
Pratt & Whitney JT8D Series Turbofan Engines
This amendment adopts a new airworthiness directive (AD) that is applicable to Pratt & Whitney (PW) JT8D series turbofan engines. This action requires a one-time borescope inspection of the combustion chamber outer case (CCOC) for cracks on engines identified by serial number that were ultrasonically inspected in accordance with AD 96-23- 14 with defective probes. In addition, this AD requires an ultrasonic probe functional check at PW prior to using the probe to perform an ultrasonic inspection if the probe was overhauled, repaired, or otherwise altered since original manufacture and not subsequently functionally checked by PW. This amendment is prompted by reports of defective probes discovered in the field. The actions specified in this AD are intended to prevent uncontained engine failure, inflight engine shutdown, engine cowl release, and airframe damage.
AD 98-04-14 · published Feb 26, 1998, effective Mar 13, 1998
Pratt & Whitney PW4164, PW4168, and PW4168A Series Turbofan Engines
This amendment adopts a new airworthiness directive (AD) that is applicable to Pratt & Whitney PW4164, PW4168, and PW4168A series turbofan engines. This action requires initial and repetitive inspections for loose or broken front pylon mount bolts, replacement, if necessary, with new bolts, and establishment of a new cyclic life limit. This amendment is prompted by new flight test data that indicate higher than predicted loads. The actions specified in this AD are intended to prevent front pylon mount bolt failure, which could result in engine separation from the aircraft.
AD 98-04-15 · published Feb 26, 1998, effective Apr 27, 1998
AlliedSignal Inc. TPE331 Series Turboprop and TSE331 Turboshaft Engines
This amendment adopts a new airworthiness directive (AD), applicable to AlliedSignal Inc., (formerly Garrett Engine Division, Garrett Turbine Engine Company and AiResearch Manufacturing Company of Arizona) TPE331 series turboprop and TSE331 turboshaft engines, that requires replacement or radiographic inspection, and replacement, if necessary, of certain third stage turbine stators with serviceable parts. This amendment is prompted by a report of an outer band weld that cracked subsequent to a radiographic inspection required by a previous AD. The actions specified by this AD are intended to prevent third stage turbine wheel separation due to thermal fatigue cracking and shifting of the third stage turbine stator, which could contact the third stage turbine wheel and result in an uncontained engine failure and damage to the aircraft.
AD 97-24-06 · published Feb 10, 1998, effective Mar 13, 1998
Glasflugel Models Standard Libelle and Standard Libelle 201 B Sailplanes
This amendment adopts a new airworthiness directive (AD) that applies to Glasflugel Models Standard Libelle and Standard Libelle 201 B sailplanes. This action requires inspecting the aileron operating lever's actuating shaft welded seams for cracks; modifying or replacing the actuating shaft, if cracked; and, if no cracks are found, eventually modifying or replacing the shaft. Cracks found in the welded seams of the actuating shaft prompted this action. The actions specified by this AD are intended to prevent cracks in the aileron operating lever's actuating shaft welded seams, which, if not detected and corrected, could cause loss of control of the sailplane.
AD 98-04-30 · published Feb 26, 1998, effective May 15, 1998
Glaser-Dirks Flugzeugbau GmbH Model DG- 500M Gliders
This amendment adopts a new airworthiness directive (AD) that applies to all Glaser-Dirks Flugzeugbau GmbH (DG Flugzeugbau) Model DG- 500M gliders. This AD requires repetitively inspecting the propeller mounting plate for cracks, replacing any cracked propeller mounting plate, and modifying the bolt connections of the propeller mounting plate. This AD is the result of mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for Germany. The actions specified in this AD are intended to prevent the propeller mounting plate from separating from the glider, which could result in propeller separation and possible loss of control of the glider.
AD 98-04-46 · published Feb 27, 1998, effective Apr 3, 1998
Alexander Schleicher Segelflugzeugbau Model ASW-19 Sailplanes
This amendment adopts a new airworthiness directive (AD) that applies to certain Alexander Schleicher Segelflugzeugbau (Alexander Schleicher) Model ASW-19 sailplanes. This AD requires modifying the inspection hole cover in the fuselage area. This AD is the result of mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for Germany. The actions specified by this AD are intended to prevent loss of aileron control caused by an inspection hole cover entering the fuselage, which could result in loss of control of the sailplane.
