35 Airworthiness Directives: 27 airplane, 1 rotorcraft, 4 engine, 1 propeller, 2 appliance.
AD 93-24-02 R1 · published Feb 1, 1994, effective Feb 15, 1994
Piper Aircraft Inc. Airplanes
AD 94-01-11 · published Feb 1, 1994, effective Mar 3, 1994
Airbus Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to Airbus Model A320 series airplanes, that requires visual inspections and end-float checks of the ram air turbine (RAT), and replacement of the RAT, if necessary. This amendment is prompted by a report that, during an on-ground functional test of the RAT, the RAT broke away from its support leg. The actions specified by this AD are intended to prevent the RAT from breaking away from its support leg, which could damage the airplane structure and systems, and could injure ground personnel.
AD 94-01-13 · published Feb 1, 1994, effective Mar 3, 1994
Bombardier Inc. Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain de Havilland Model DHC-8-300 series airplanes, that requires modifying the airplane fire detection system and revising the Airplane Flight Manual (AFM) to include procedures related to operating the system. This amendment is prompted by reports of several oil fires in the inter compressor case (ICC) assembly. The actions specified by this AD are intended to prevent severe structural damage to the airplane due to an internal engine fire within the ICC.
AD 94-02-03 · published Feb 1, 1994, effective Mar 3, 1994
Various Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain Fokker Model F28 Mark 0100 series airplanes that requires replacement of the existing attachment bolts on the horizontal stabilizer with new, improved bolts having a longer fatigue life. This amendment is prompted by a report that certain attachment bolts on the horizontal stabilizer were not properly treated on the surface during production, resulting in reduced fatigue life. The actions specified by this AD are intended to prevent corrosion and subsequent fatigue-related cracking of the attachment bolts on the horizontal stabilizer, which could lead to loss of stabilizer control.
AD 94-02-04 · published Feb 1, 1994, effective Mar 3, 1994
The Boeing Company Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to all Boeing Model 727 series airplanes, that requires inspections of certain fuselage frames for cracks, and modification, if necessary; inspections to detect cracks in certain frame gussets, and replacement, if necessary; and inspections at certain body stations to detect open pilot holes and to detect cracks in any open pilot hole found, and repair and modification, if necessary. This amendment is prompted by reports of cracked frames and open pilot holes. The actions specified by this AD are intended to prevent frame failures and consequent rapid decompression of the cabin.
AD 94-03-07 · published Feb 3, 1994, effective Feb 18, 1994
The Boeing Company Airplanes
This amendment adopts a new airworthiness directive (AD) that is applicable to certain Boeing Model 767 series airplanes. This action requires inspections of the brake rod inner cylinder bolts on the main landing gear (MLG) wheels and brakes; inspections of certain MLG bushings; installation of retainer plates at each MLG brake disconnect; inspection and modification of the brake rod pin assembly at each MLG wheel; repair or replacement of discrepant parts; and revision of the Airplane Flight Manual (AFM), as necessary. This amendment is prompted by numerous reports of brake failure during landing and during a low energy rejected takeoff. The actions specified in this AD are intended to prevent failure of two or more MLG brakes, which could adversely affect the stopping performance of the airplane.
AD 93-21-04 · published Feb 4, 1994, effective Feb 4, 1994
Bombardier Inc. Airplanes
AD 94-02-08 · published Feb 10, 1994, effective Feb 10, 1994
The Boeing Company Airplanes
This amendment adopts a new airworthiness directive (AD) that is applicable to certain McDonnell Douglas Model MD-11 series airplanes. This action requires an inspection to detect chafing damage to certain wiring in the main avionics rack, repair or replacement of damaged wiring, and modification of the wiring installation. This amendment is prompted by a report of a chafed wire harness found on the main avionics rack on one airplane that resulted in arcing damage to the wire harness and adjacent structure. The actions specified in this AD are intended to prevent chafing of the main avionics rack wiring, which could result in arcing and a fire in the wire bundle; this could lead to damage to aircraft systems and loss of associated aircraft functions.
AD 94-04-01 · published Feb 10, 1994, effective Mar 31, 1994
Viking Air Limited Airplanes
This amendment supersedes two existing airworthiness directives (AD's) that currently require repetitively inspecting the wing attachment fittings and the wing front fittings for cracks on certain de Havilland DHC-6 series airplanes, and replacing any cracked part. The Federal Aviation Administration's policy on aging commuter class aircraft is to eliminate or, in certain instances, reduce the number of repetitions of certain short-interval inspections when improved parts or modifications are available. This action requires incorporating a modification that would eliminate the need for the repetitive inspections currently required by the two existing AD's. The actions specified by this AD are intended to prevent loss of control of the airplane caused by cracked wing attachment fittings.
AD 93-24-15 · published Feb 11, 1994, effective Feb 11, 1994
Cessna Aircraft Company, Textron Aviation Inc. Airplanes
AD 94-03-05 · published Feb 11, 1994, effective Mar 14, 1994
The Boeing Company Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 747-200B, -200C, -300, -400, and 400D series airplanes, that requires a revision to the FAA-approved maintenance program to require unrestricted opening of the passenger service unit (PSU) door during functional testing of the passenger oxygen system; and requires an inspection to detect leaks in certain passenger oxygen system reservoir bags, and marking and replacement of damaged mask assemblies. This amendment is prompted by reports that the passenger oxygen mask reservoir bags became overpressurized and split at the seams, resulting in failure of the bags. The actions specified by this AD are intended to ensure the delivery of emergency oxygen through the passenger oxygen system reservoir mask assemblies.
AD 93-25-14 · published Feb 14, 1994, effective Feb 14, 1994
Saab AB, Saab Aerosystems Airplanes
AD 93-25-15 · published Feb 14, 1994, effective Feb 14, 1994
Textron Aviation Inc. Airplanes
AD 94-01-02 · published Feb 14, 1994, effective Feb 14, 1994
The Boeing Company Airplanes
AD 93-25-07 · published Feb 15, 1994, effective Feb 15, 1994
Raytheon Aircraft Company Airplanes
AD 94-04-03 · published Feb 17, 1994, effective Mar 21, 1994
The Boeing Company Airplanes
This amendment supersedes an existing airworthiness directive (AD), applicable to all Boeing Model 727 series airplanes, that currently requires repetitive inspections to detect cracks in the slat track roller bearing bolts, and replacement, if necessary. This amendment adds an inspection of the positional plates installed on certain airplanes, and replacement, if necessary; reduces the compliance time for the initial inspection; and cites the latest revision to the service bulletin as the appropriate service information source. This amendment is prompted by a report that certain positional plates may not stop rotation of the roller bearing bolts. The actions specified by this AD are intended to prevent jamming of the affected slat or separation of the slat from the airplane.
AD 94-04-06 · published Feb 17, 1994, effective Mar 21, 1994
Various Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain Fokker Model F28 Mark 0100 series airplanes, that requires replacement of the existing ground/flight microswitches located in the main landing gear with improved microswitches, and installation of an anti-skid system ON/OFF switch in the flight compartment. This amendment is prompted by an incident involving loss of braking, which was caused by mechanical ground/flight microswitches that froze while in the flight position. The actions specified by this AD are intended to prevent loss of braking below 40 miles per hour, when the anti-skid system is activated.
AD 94-04-07 · published Feb 18, 1994, effective Mar 7, 1994
Textron Aviation Inc. Airplanes
This amendment adopts a new airworthiness directive (AD) that is applicable to certain Beech Model 400A airplanes. This action requires rework or replacement of certain hubcaps on the main landing gear. This AD also requires incorporation of procedures into the FAA-approved maintenance program for inspections of the transducer drive clip to ensure that the drive clip gap does not exceed a specified limit. This amendment is prompted by a report that a Beech Model 400A airplane lost its anti-skid braking system during landing roll out. The actions specified in this AD are intended to prevent degradation or loss of braking performance. Comments for inclusion in the Rules Docket must be received on or before April 19, 1994.
AD 94-04-09 · published Feb 22, 1994, effective Mar 24, 1994
Bombardier Inc. Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain de Havilland Model DHC-8-100 and DHC-8-300 series airplanes, that requires inspections to detect breakage in the engine rear mount strut assemblies, and replacement of broken struts. This amendment also requires eventual replacement of all currently installed struts with new and/or reworked struts, as terminating action for the inspections. This amendment is prompted by several reports of failure of the engine rear mount struts, due to fracture at one of the rosette welds on the shank of the strut where full weld depth was not achieved during manufacture. The actions specified by this AD are intended to prevent fracture of the engine rear mount struts, which could reduce the structural integrity of the nacelle and engine support structure.
AD 94-04-12 · published Feb 22, 1994, effective Apr 12, 1994
Twin Commander Aircraft LLC Airplanes
This amendment adopts a new airworthiness directive (AD) that applies to certain Twin Commander Aircraft Corporation (Twin Commander) Models 685, 690, 690A, and 690B airplanes. This action requires modifying the wing ribs at Wing Station (WS) 39, inspecting (one-time) WS 39 for cracks or corrosion, treating any corrosion found, and replacing any cracked wing front spar lower cap (spar cap). Several reports of cracked spar caps and cracked and deformed wing ribs at WS 39 on the affected airplanes prompted this action. The actions specified by this AD are intended to prevent failure of the wing structure caused by a cracked spar cap or cracked or deformed wing rib at WS 39.
AD 94-04-13 · published Feb 22, 1994, effective Apr 12, 1994
Twin Commander Aircraft LLC Airplanes
This amendment supersedes Airworthiness Directive (AD) 65-06-01, which currently requires repetitively inspecting the wing front spar lower cap (spar cap) of both the left and right wings on certain Twin Commander Aircraft Corporation (Twin Commander) 500 and 600 series airplanes, and replacing any cracked spar cap. Front spar cap cracks developing on certain Twin Commander model airplanes not affected by that AD prompted this action. In addition, the manufacturer has updated the inspection procedures through improved service information. This action retains the inspection and repair requirements of AD 65-06-01, and requires inspecting in accordance with updated service information and increases the applicability to include other model airplanes. The actions specified by this AD are intended to prevent failure of the wing structure caused by cracks in the spar cap.
AD 94-04-14 · published Feb 22, 1994, effective Apr 12, 1994
Twin Commander Aircraft LLC Airplanes
This amendment supersedes Airworthiness Directive (AD) 91-08-09, which currently requires the following on certain Twin Commander Aircraft Corporation (Twin Commander) 500, 680, 681, 685, and 690 series airplanes: repetitively inspecting the wing front spar lower cap (spar cap) for corrosion; and replacing the spar cap if corrosion exceeds certain limits. This action incorporates updated and more detailed inspection procedures, extends the repetitive inspection intervals, and provides the option of incorporating one of three modifications as terminating action for the repetitive inspections. The actions specified by the AD are intended to prevent wing structural damage that, if not detected, could progress to the point of failure.
AD 94-04-15 · published Feb 22, 1994, effective Apr 12, 1994
Twin Commander Aircraft LLC Airplanes
This amendment adopts a new airworthiness directive (AD) that applies to certain Twin Commander Aircraft Corporation (Twin Commander) Models 500, 560A, 560E, 680, 680E, and 720 airplanes. This action requires inspecting the wing front spar lower cap (spar cap) for interference, fretting, or corrosion between the firewall flange and spar cap flange at Wing Station (WS) 96, and clearing any interference, repairing any fretting or corrosion damage, and replacing any cracked spar cap. Reports of two of the affected airplanes having cracked spar caps at WS 96 prompted this action. The actions specified by this AD are intended to prevent failure of the wing structure caused by a cracked spar cap at WS 96.
AD 94-04-16 · published Feb 23, 1994, effective Apr 11, 1994
Mitsubishi Heavy Industries, Ltd. Airplanes
This amendment adopts a new airworthiness directive (AD) that applies to certain Mitsubishi Heavy Industries, Ltd., (Mitsubishi) MU-2B series airplanes. This action requires reducing the maximum deflection of the elevator nose-down trim to a 1-degree to 3-degree range. Analysis of service history on the affected airplanes has revealed one accident and two incidents where the existing elevator nose-down trim deflection caused excessive control wheel force. The actions specified by this AD are intended to prevent excessive control wheel force caused by extreme elevator nose-down trim deflection, which could result in loss of control of the airplane.
AD 94-04-17 · published Feb 24, 1994, effective Apr 15, 1994
Twin Commander Aircraft LLC Airplanes
This amendment adopts a new airworthiness directive (AD) that applies to Twin Commander Aircraft Corporation (Twin Commander) 500, 520, 560, 680, 681, 685, 690, 695, and 720 series airplanes. This action requires inspecting the flap system for cables with broken wires or pulleys with worn cable clips, replacing any damaged parts, and replacing the master pulley and cable with new parts of improved design. Reports of cable fatigue, particularly the master pulley cable, on several of the affected airplanes prompted this action. The actions specified by this AD are intended to prevent flap system failure caused by cable fatigue, which could result in loss of control of the airplane.
AD 94-02-07 · published Feb 28, 1994, effective Feb 28, 1994
The Boeing Company Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain McDonnell Douglas Model MD-11 series airplanes, that requires replacing the anti-skid control unit. This amendment is prompted by three reports of failure of the center landing gear drag link, after which the center landing gear swung aft and struck the fuselage. The actions specified by this AD are intended to prevent failure of the center landing gear drag link, which could result in extensive damage to the fuselage structure.
AD 93-23-04 · published Feb 17, 1994, effective Feb 17, 1994
Airbus Helicopters Helicopters
AD 94-03-02 · published Feb 1, 1994, effective Feb 16, 1994
Pratt & Whitney Canada Corp. Engines
This amendment adopts a new airworthiness directive (AD) that is applicable to Pratt & Whitney Canada PW100 series turboprop engines. This action requires a life limit reduction for affected high pressure turbine (HPT) disks, and establishes a drawdown schedule for disks currently near, at, or greater than the new reduced service life. This amendment is prompted by reports of two HPT disk failures, one of which was uncontained. The actions specified in this AD are intended to prevent an uncontained HPT disk failure and damage to the aircraft.
AD 93-25-17 · published Feb 2, 1994, effective Feb 2, 1994
General Electric Company Engines
AD 94-02-01 · published Feb 4, 1994, effective Feb 4, 1994
Honeywell International Inc. Engines
This amendment adopts a new airworthiness directive (AD) that is applicable to Textron Lycoming Model T5508D turboshaft engines. This action requires a cyclic life reduction for the T5508D impeller, a more conservative method for determining low cycle fatigue (LCF) damage to the impeller, and a method for prorating past impeller usage, based on the new LCF counting factors. This amendment is prompted by a report of a rotorcraft accident found to have been caused by an uncontained impeller failure. A subsequent field campaign inspection of high-time impellers utilized by heavy lift operators confirmed 12 more impellers with similar distress. The actions specified in this AD are intended to prevent an impeller failure, which can result in an uncontained engine failure, inflight shutdown, or possible rotorcraft damage.
AD 93-25-05 · published Feb 22, 1994, effective Feb 22, 1994
Rolls-Royce Corporation Engines
AD 94-03-11 · published Feb 28, 1994, effective Feb 28, 1994
Hartzell Propeller, Inc. Propellers
AD 93-24-16 · published Feb 4, 1994, effective Feb 4, 1994
Airbus, ATR - GIE Avions de Transport Régional, BAE Systems (Operations) Limited, The Boeing Company, Bombardier Inc., Fokker Services, Lockheed Martin Corporation, Puritan-Bennett Aero Systems, Saab AB, Saab Aerosystems, Short Brothers PLC Appliances
AD 94-01-04 · published Feb 4, 1994, effective Feb 4, 1994
Airbus, The Boeing Company, Bombardier Inc., Cessna Aircraft Company, Dassault Aviation, Fokker Services, Gulfstream Aerospace Corporation, Textron Aviation Inc., Honeywell, Inc., Lockheed Martin Corporation, Short Brothers PLC, Viking Air Limited Appliances
