37 Airworthiness Directives: 30 airplane, 1 rotorcraft, 5 engine, 1 appliance.
AD 94-07-07 · published May 5, 1994, effective May 5, 1994
The Boeing Company Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain McDonnell Douglas Model MD-11 and MD-11F airplanes, that requires modification of the fuel crossfeed low level dump system shutoff. This amendment is prompted by an FAA determination that, in the event of a failure of the number 2 bus tie relay and the subsequent loss of the number 2 electrical power source, an all-engine flameout event could occur due to fuel starvation during or shortly after a fuel dumping operation. The actions specified by this AD are intended to prevent loss of the fuel dump system shutoff due to a failure of the number 2 DC bus electrical relay and the subsequent loss of the number 2 electrical power source.
AD 94-09-01 · published May 5, 1994, effective May 5, 1994
McDonnell Douglas Corporation 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 eddy current inspection to detect defects in the upper and lower lock links on the nose landing gear (NLG), and rework or replacement of any defective link found. This amendment is prompted by reports of cracking and subsequent failure of certain lock links on these airplanes, which have been attributed to forging defects in the lock links. The actions specified in this AD are intended to prevent collapse of the NLG.\n\n\tThe incorporation by reference of certain publications listed in the regulations is approved by the Director of the Federal Register as of May 5, 1994.\n\n\tComments for inclusion in the Rules Docket must be received on or before June 20, 1994.
AD 94-09-05 · published May 5, 1994, effective Jun 6, 1994
Viking Air Limited Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain de Havilland Model DHC-7 series airplanes, that requires a one-time inspection to assess the adequacy of the clearance between various adapter plates and seal retaining angles on the fuselage side access panel, and modification of both the forward and rear seal retention angles. This amendment is prompted by reports of incidents involving corrosion and fatigue cracking in commuter-class airplanes that are approaching or have exceeded their economic design goal. The actions specified by this AD are intended to prevent degradation of the structural capabilities of the affected airplanes.
AD 94-10-03 · published May 6, 1994, effective May 23, 1994
The Boeing Company Airplanes
This amendment adopts a new airworthiness directive (AD) that is applicable to certain McDonnell Douglas Model MD-11 and MD-11F series airplanes. This action requires deactivation of the Visual Omnidirectional Receiver/Localizer (VOR/LOC) option by revising the program pin wiring for the Flight Management Computer/Flight Control Computer (FMC/FCC). This amendment is prompted by reports of uncommanded roll mode changes on these airplanes during takeoff and landing due to incorrect initialization of VOR/LOC logic within the FMC. The actions specified in this AD are intended to prevent the airplane from deviating from its intended flight path due to an uncommanded change in the course of direction.
AD 94-09-12 · published May 10, 1994, effective Jun 9, 1994
The Boeing Company Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain McDonnell Douglas Model DC-8, DC-9, and DC-9-80 series airplanes; Model MD-88 airplanes; and C-9 (military) airplanes; that requires inspection of the center and side windshields, and replacement of discrepant windshields. This amendment is prompted by reports that the core ply of certain windshields was incorrectly tempered during the manufacturing process. The actions specified by this AD are intended to prevent failure of the windshield.
AD 94-07-01 · published May 16, 1994, effective May 16, 1994
The Boeing Company Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain McDonnell Douglas Model MD-11 and MD-11F series airplanes, that requires modification of the cavity vent drain tube assembly at the center wing lower auxiliary fuel tank cavity. This amendment is prompted by a report that the cavity vent tube, if not properly grounded, could act as an electrical path in the event of a lightening strike. The actions specified by this AD are intended to prevent arcing in the tank cavity and possible resulting fire.
AD 94-07-13 · published May 16, 1994, effective May 16, 1994
Various Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to Fokker Model F-28 Mark 0100 series airplanes, that requires inspection, necessary repair, and modification of the engine mount shear shelf webs. This amendment is prompted by reports of interference between the engine mount shear shelf web and the fixed cowl mid and aft hooks, which caused fatigue cracks to occur in the web. The actions specified by this AD are intended to prevent fatigue cracking and other damage to the structure of the shear shelf web, which subsequently could lead to loss of the engine mounting structure.
AD 94-09-09 · published May 16, 1994, effective May 16, 1994
Saab AB, Saab Aerosystems Airplanes
This amendment adopts a new airworthiness directive (AD) that is applicable to certain SAAB Model SAAB SF340A and SAAB 340B airplanes. This action requires installation of a placard in the cockpit that informs the flight crew of the prohibition against moving the power levers below "flight idle" (beta mode) when the airplane is airborne. This amendment is prompted by an incident during which a Model SAAB 340B airplane, that was in "beta mode" for a short duration during descent, lost all engine power. The action specified in this AD is intended to prevent engine overspeed and the resultant loss of engine power.
AD 91-09-14 R1 · published May 18, 1994, effective May 18, 1994
The Boeing Company Airplanes
AD 94-09-13 · published May 18, 1994, effective Jun 17, 1994
The Boeing Company Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 747 series airplanes, that requires replacement of certain pneumatic duct couplings with redesigned couplings. This amendment is prompted by reports of failures of certain duct couplings installed on the wing leading edge pneumatic duct. The actions specified by this AD are intended to prevent such failures, which could lead to structural damage to the wing leading edge, flight control problems, or fire.
AD 94-10-07 · published May 18, 1994, effective Jun 17, 1994
Bombardier Inc. Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain de Havilland Model DHC-8-301 airplanes, that requires modification of the sidewall panels in the passenger cabin. This amendment is prompted by a report that inadequate venting between the cabin and the compartments beneath the floor could occur during rapid fuselage decompression. The actions specified by this AD are intended to prevent collapse of the floor and subsequent injury to passengers.
AD 94-10-08 · published May 18, 1994, effective Jun 17, 1994
The Boeing Company Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 767 series airplanes, that requires dye penetrant inspections and proof pressure testing to detect cracks or ruptures of the crossover pneumatic duct, and repair or replacement, as necessary. This amendment also requires stress relieving of the crossover pneumatic duct assembly. This amendment is prompted by reports of ruptured engine bleed air crossover ducts. The actions specified by this AD are intended to prevent failure of the engine bleed air crossover duct, which could result in loss of pneumatics and damage to adjacent structure.
AD 94-10-06 · published May 19, 1994, effective Jun 20, 1994
The Boeing Company Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 707/720 series airplanes, that requires certain structural inspections of older airplanes. This amendment is prompted by reports of incidents involving fatigue cracking and corrosion in transport category airplanes that are approaching or have exceeded their economic design service goal. The actions specified by this AD are intended to prevent degradation of the structural capabilities of the affected airplanes. This amendment relates to the recommendations of the Airworthiness Assurance Task Force assigned to review Model 707/720 series airplanes, which indicate that, to assure long term continued operational safety, various structural inspections should be accomplished.
AD 94-10-10 · published May 19, 1994, effective Jun 20, 1994
The Boeing Company Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to Boeing Model 747-100, -200, and -300 series airplanes, that requires modification of the thrust reverser control system by installing a solenoid-operated shut-off valve. This amendment is prompted by incidents of deployment of the engine fan thrust reverser during flight. The actions specified by this AD are intended to prevent such deployment, which could result in reduced controllability of the airplane.
AD 91-26-05 R1 · published May 20, 1994, effective May 20, 1994
The Boeing Company Airplanes
AD 94-08-13 · published May 20, 1994, effective May 20, 1994
Various Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain Fokker Model F-28 Mark 0100 series airplanes, that requires the installation of modified Flight Warning Computers and Flight Augmentation Computers. This amendment is prompted by reports of nuisance yaw-damper fault warnings and undetected horizontal trim motion, and the development of improved computers that eliminate these problems. The actions specified by this AD are intended to prevent nuisance warnings in the cockpit and undetected trim motion, both of which could compromise the safe takeoff of the airplane.
AD 94-08-15 · published May 20, 1994, effective May 20, 1994
Bombardier Inc. Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain Canadair Model CL-600-2A12 and CL-600-2B16 series airplanes, that requires a one-time visual inspection to verify proper installation of shoulder bolts and to detect damage of the adjacent flap actuator housings, and correction of discrepancies. This amendment is prompted by a report of failure of the flap actuator on the left wing inboard flap. The actions specified by this AD are intended to prevent asymmetric deployment or retraction (blow back) of the flaps, which could reduce controllability of the airplane.
AD 94-09-03 · published May 20, 1994, effective May 20, 1994
BAE Systems (Operations) Limited Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain British Aerospace Model BAe 146 series airplanes, that requires that the brake wear limits prescribed in this proposal be incorporated into the FAA-approved maintenance inspection program. This amendment is prompted by an accident in which a transport category airplane executed a rejected takeoff (RTO) and was unable to stop on the runway due to worn brakes; and the subsequent review of allowable brake wear limits for all transport category airplanes. The actions specified by this AD are intended to prevent the loss of brake effectiveness during a high energy RTO.
AD 94-09-04 · published May 20, 1994, effective May 20, 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 flight control computers (FCC) with new, improved FCC's; and removal of certain limitations from the Airplane Flight Manual (AFM), if necessary. This amendment is prompted by reports indicating that, during a level change descent with auto throttles engaged and manual flight, airplanes inadvertently have approached near minimum speeds. The actions specified by this AD are intended to prevent inadvertent loss of airspeed during a level change descent.
AD 94-09-17 · published May 20, 1994, effective May 20, 1994
McDonnell Douglas Corporation Airplanes
This amendment adopts a new airworthiness directive (AD) that is applicable to all McDonnell Douglas Model DC-10 series airplanes and KC-10A (military) airplanes. This action requires inspections to determine the serial numbers and to detect defects in the upper and lower lock links on the nose landing gear (NLG), and rework or replacement of any defective link found. This amendment is prompted by reports of cracking and subsequent failure of certain lock links on these airplanes, which have been attributed to forging defects in the lock links. The actions specified in this AD are intended to prevent collapse of the NLG.\n\n\tThe incorporation by reference of certain publications listed in the regulations is approved by the Director of the Federal Register as of May 20, 1994.\n\n\tComments for inclusion in the Rules Docket must be received on or before July 5, 1994.
AD 94-07-02 · published May 23, 1994, effective May 23, 1994
The Boeing Company Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain McDonnell Douglas Model DC-10 series airplanes and KC-10A (military) airplanes, that requires modification of the cavity vent drain tube assembly at the center wing lower auxiliary fuel tank cavity. This amendment is prompted by a report that the cavity vent tube, if not properly grounded, could act as an electrical path in the event of a lightning strike. The actions specified by this AD are intended to prevent arcing in the tank cavity and possible resulting fire.
AD 94-07-12 · published May 23, 1994, effective May 23, 1994
BAE Systems (Operations) Limited Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to Jetstream Model ATP series airplanes, that requires inspections to detect fatigue-related cracking and loose rivets in the subframe yoke assemblies of the quick engine change units (QECU) on both wings; replacement of rivets; and repair or replacement of yoke assemblies, if necessary. This amendment is prompted by in-service and fatigue test reports of cracking in the yoke of a QECU subframe. The actions specified by this AD are intended to prevent loss of structural integrity of the engine mount.
AD 94-08-02 · published May 23, 1994, effective May 23, 1994
BAE Systems (Operations) Limited Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain Jetstream Model ATP series airplanes, that requires modification of the wiring for the electric-powered disconnect unit for the elevator control system and a subsequent functional test of the elevator control system. This amendment is prompted by an in-service report of damaged wire insulation in the electrical power circuit for the elevator disconnect unit, which resulted in grounding of the circuit and consequent uncommanded operation of the disconnect unit. The actions specified by this AD are intended to prevent uncommanded operation of the elevator disconnect unit, which would result in single elevator operation and, consequently, reduced controllability of the airplane.
AD 94-11-02 · published May 26, 1994, effective Jun 10, 1994
The Boeing Company Airplanes
This amendment adopts a new airworthiness directive (AD) that is applicable to all Boeing Model 767 series airplanes. This action requires repetitive detailed visual and eddy current inspections to detect cracks of certain midspar fuse pins, and replacement of any cracked midspar fuse pin with a new fuse pin. This amendment is prompted by reports of longitudinal fatigue cracks on certain midspar fuse pins installed on Boeing Model 767 series airplanes. The actions specified in this AD are intended to prevent loss of the strut and engine due to cracking of both fuse pins on the same strut.
AD 94-11-03 · published May 26, 1994, effective Jun 10, 1994
Raytheon Aircraft Company, Hawker Beechcraft Corporation Airplanes
This amendment adopts a new airworthiness directive (AD) that is applicable to certain Raytheon Corporate Jets Model DH/BH/HS BAe 125 and Hawker 800 and 1000 series airplanes. This action requires a visual inspection to determine whether adequate clearance exists between the fan venturi motor casing and the adjacent equipment, and adjustments, if necessary; and a visual inspection to detect signs of overheating, degradation of insulating materials, and ingestion of debris into the motor, and replacement of discrepant parts with serviceable parts. This amendment is prompted by reports of smoke emanating from the lavatory due to overheating of the fan venturi motor. The actions specified in this AD are intended to prevent smoke or fire in the cabin while the airplane is in flight. Comments for inclusion in the Rules Docket must be received on or before July 5, 1994.
AD 94-07-10 · published May 27, 1994, effective May 27, 1994
M7 Aerospace LP Airplanes
This amendment adopts a new airworthiness directive (AD) that applies to certain Fairchild Aircraft SA226 and SA227 series airplanes. This action requires repetitively inspecting (visually) the wing skin for cracks; dye penetrant inspecting the spar straps if the wing skin is found cracked; and, if any crack is found in the spar straps, repairing the spar straps and modifying the wing skin. This action also provides the option of modifying the wing skin as terminating action for the repetitive inspections. Reports of wing skin cracking because of repeated bending of the wing during service on several of the affected airplanes prompted this action. The actions specified by this AD are intended to prevent failure of the wing skin at the top aft outboard corner of the battery box, which could result in structural damage to the wing.
AD 94-11-04 · published May 27, 1994, effective Jun 10, 1994
Mitsubishi Heavy Industries, Ltd. Airplanes
This amendment adopts a new airworthiness directive (AD) that applies to certain Mitsubishi Heavy Industries MU-2B series airplanes. This action requires adjusting the engine underspeed governor minimum stop (ground idle) and the airframe condition control linkage, modifying the tachometer indicator markings, fabricating and installing a placard that specifies a minimum idle speed, and incorporating Airplane Flight Manual (AFM) revisions. An accident of one of the affected airplanes where the propeller hub assembly failed and the propeller separated from the airplane prompted this action. Accident investigation analysis indicates a reduction in fatigue strength of the propeller hub because of high vibration frequencies during ground idle speed. The actions specified by this AD are intended to prevent propeller hub arm assembly failure because of high vibration frequencies during ground idle speed and possible separation of the propeller from the airplane, which could result in loss of control of the airplane.
AD 94-10-05 · published May 31, 1994, effective May 31, 1994
The Boeing Company Airplanes
AD 94-11-05 · published May 31, 1994, effective Jun 15, 1994
The Boeing Company Airplanes
This amendment adopts a new airworthiness directive (AD) that is applicable to certain Boeing Model 767-200 and 767-300 series airplanes. This action requires repetitive inspections of the pumping unit assembly on the override and jettison fuel boost pump assemblies to detect looseness of the screws that attach the inlet diffuser assembly to the pumping unit housing, and repair or replacement of the pumping unit assembly with a serviceable assembly, if necessary. For certain airplanes, this AD also provides for deactivation of the center wing fuel tank as an alternative to the repetitive inspections. This amendment is prompted by reports of failures of the override and jettison fuel pumps due to damage to impeller units and pumping unit housings caused by loose diffuser rings in the fuel pump assemblies of these airplanes. During dry fuel operation, a loose diffuser ring may cause metal-to-metal contact. The actions specified in this AD are intended to prevent the generation of sparks and a potential ignition source inside the fuel tank caused by metal-to-metal contact during dry fuel pump operation.
AD 94-11-06 · published May 31, 1994, effective Jun 15, 1994
McDonnell Douglas Corporation Airplanes
This amendment adopts a new airworthiness directive (AD) that is applicable to certain McDonnell Douglas Model MD-11 and MD-11F series airplanes. This action requires modification of the external power feeder cable clamping installation. This amendment is prompted by reports of damage to the external power feeder cables located under the forward cargo compartment floor, which was caused by excessive cable length and/or maintenance personnel stepping on the cables. The actions specified in this AD are intended to prevent arcing from occurring under the forward cargo compartment floor as a result of damaged external power feeder cables, a situation that could lead to a fire at this location.
AD 94-11-01 · published May 18, 1994
Robinson Helicopter Company Helicopters
AD 94-08-05 · published May 5, 1994, effective Jul 5, 1994
General Electric Company Engines
This amendment adopts a new airworthiness directive (AD), applicable to General Electric Company (GE) CF6-45/-50 series turbofan engines, that requires installation of a fan stator case stiffening ring assembly, and a new stage one fan shroud. This amendment is prompted by a report of an uncontained stage one fan blade failure, which resulted in an inflight engine shutdown, and damage to the aircraft. The actions specified by this AD are intended to prevent an uncontained stage one fan blade failure, which can result in an inflight engine shutdown, and damage to the aircraft.
AD 94-08-06 · published May 5, 1994, effective Jul 5, 1994
Pratt & Whitney Division Engines
This amendment adopts a new airworthiness directive (AD), applicable to Pratt & Whitney JT9D-7R4 series turbofan engines, that requires initial and repetitive fan blade leading edge inspections, and either installation of fan blade sets with modified fan blade shrouds or rework of the fan blade shrouds as a terminating action to the inspections. This amendment is prompted by reports of flutter-induced fan blade fractures. The actions specified by this AD are intended to prevent fan blade fracture and uncontained engine failure, resulting in possible damage to the aircraft.
AD 94-09-07 · published May 5, 1994, effective Jul 5, 1994
Teledyne Continental Motors Engines
This amendment adopts a new airworthiness directive (AD), applicable to certain Teledyne Continental Motors (TCM) IO-346, IO-520, and IO-550 series piston engines, that requires initial and repetitive inspections of the engine mount brackets for cracks, and if found cracked, replacement with improved design engine mount brackets. All engine mount brackets require replacement with improved design engine mount brackets at the next engine removal after the effective date of this AD. This amendment is prompted by reports of cracks in engine mount brackets on engines that have completed at least one overhaul cycle. The actions specified by this AD are intended to prevent engine separation from the aircraft due to cracks in the engine mount brackets.
AD 94-09-18 · published May 5, 1994, effective Jun 6, 1994
General Electric Company Engines
This amendment adopts a new airworthiness directive (AD), applicable to General Electric Company (GE) CF6-6/-45/-50 series turbofan engines, that requires an inspection for cracks in the stage 1 high pressure turbine (HPT) disk rim bolt holes, and stage 2 HPT disk rim and inner bolt holes; and replacement, if necessary, with serviceable parts. This amendment is prompted by a report of an uncontained stage 1 HPT disk failure which resulted in an aborted takeoff. The actions specified by this AD are intended to prevent an uncontained stage 1 or stage 2 HPT disk failure, which could result in an inflight engine shutdown, rejected takeoff, or damage to the aircraft.
AD 94-09-08 · published May 20, 1994, effective May 20, 1994
Honeywell International Inc. Engines
This amendment adopts a new airworthiness directive (AD) that is applicable to certain Allied-Signal Inc., Garrett Engine Division, TPE331 series turboprop and Model TSE331-3U turboshaft engines. This action requires inspection of certain third stage turbine stator assemblies, and replacement, if necessary, with serviceable assemblies. This amendment is prompted by reports of six third stage turbine stator assemblies assembled with inner seal supports made of incorrect material that results in a significantly reduced cyclic life. The actions specified by this AD are intended to prevent an uncontained failure of the third stage turbine wheel.
AD 94-06-09 · published May 5, 1994, effective May 20, 1994
Teledyne Continental Motors Appliances
This document publishes in the Federal Register an amendment adopting airworthiness directive (AD) 94-06-09 that was sent previously to all known U.S. owners and operators of Teledyne Continental Motors (TCM) (formerly Bendix) SC-20, SC-200, and S-1200 series magnetos by individual letters. This AD requires inspection to determine if capacitors that may have an intermittent open circuit condition are installed in magnetos, and replacement, if necessary, with serviceable capacitors. This amendment is prompted by reports that TCM produced and delivered magneto capacitors that have the potential for an intermittent open circuit condition that may exist between the internal through-lead and the p-lead stud terminal. The actions specified by this AD are intended to prevent possible injury or death to ground personnel due to a non-grounded magneto.
