27 Airworthiness Directives: 22 airplane, 1 rotorcraft, 2 engine, 1 propeller, 1 appliance.
AD 94-08-09 · published Jun 6, 1994, effective Jun 6, 1994
BAE Systems (Operations) Limited Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to Jetstream Model ATP airplanes, that requires a one-time inspection and appropriate torque loading check of certain wing top surface stringer joint fasteners, and correction of discrepancies. This amendment is prompted by a report of loose fasteners on the wing top surface stringer joint bolts at Rib 0. The actions specified by this AD are intended to prevent reduced structural integrity of the wing top surface stringer joints at Rib 0, which subsequently could lead to reduced structural integrity of the wing.
AD 94-08-11 · published Jun 6, 1994, effective Jun 6, 1994
BAE Systems (Operations) Limited Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain Jetstream Model ATP airplanes, that requires replacement of certain circuit breakers on the left- and right-hand AC generator panel assemblies with new circuit breakers. This amendment is prompted by reports of failures due to localized overheating of the electric power circuit for the air conditioning recirculation fan in the environmental control system (ECS). The actions specified by this AD are intended to prevent the recirculation fan circuit from overheating, which could lead to smoke and/or flame in the fuselage.
AD 94-08-12 · published Jun 6, 1994, effective Jun 6, 1994
ATR - GIE Avions de Transport R gional Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain Aerospatiale Model ATR72 series airplanes, that requires inspections to detect cracking in the brake side half hub in the bearing housing area of certain main landing gear (MLG) wheels, and replacement of the MLG wheel, if necessary. This amendment also requires the eventual replacement of certain MLG wheels with other wheels, as terminating action for the repetitive inspections. This amendment is prompted by in-service experience that indicates the possibility of fatigue cracking occurring in the subject area. The actions specified by this AD are intended to prevent failure of the brake side half hub due to fatigue cracking, which could lead to separation of the MLG wheel and tire from the axle.
AD 94-11-09 · published Jun 7, 1994, effective Jul 7, 1994
Textron Aviation Inc. Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain Beech Model 400A and 400T airplanes, that requires inspection to detect damage of the wire harness in the wheel well of the main landing gear (MLG), and modification, if necessary. This amendment is prompted by reports of damage to wire harnesses due to abrasion. The actions specified by this AD are intended to prevent loss of control of the fuel supply to the engine or loss of control of the retraction/extension system for the MLG and MLG door.
AD 94-09-15 · published Jun 8, 1994, effective Jun 8, 1994
Airbus Airplanes
This amendment supersedes an existing airworthiness directive (AD), applicable to certain Airbus Model A300 series airplanes, that currently requires repetitive inspections of the aft bulkhead to detect cracks, and repair, if necessary. This amendment requires expansion of the inspection area and modication of the aft pressure bulkhead, which terminates the inspection requirements. This amendment is prompted by a tear down inspection conducted by the manufacturer, which revealed fatigue cracking in additional areas of the aft pressure bulkhead. The actions specified by this AD are intended to prevent potential loss of cabin pressurization.
AD 94-12-02 · published Jun 13, 1994, effective Jul 13, 1994
Saab AB, Saab Aerosystems Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain Saab Model SAAB SF340A and SAAB 340B series airplanes, that requires an inspection of the elevator and aileron coves, and further inspections and repair, if necessary. This amendment is prompted by a report of delamination between the composite structure and the aluminum foil on the elevator cove on a Model SAAB SF340B series airplane. The actions specified by this AD are intended to prevent jamming of the aileron or elevator.
AD 94-12-04 · published Jun 13, 1994, effective Jul 13, 1994
The Boeing Company Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 747 series airplanes, that requires repetitive inspections to detect cracking in certain fuselage skin lap joints, and repair, if necessary. This amendment is prompted by the results of extensive pressure fatigue tests conducted by the manufacturer. The actions specified by this AD are intended to detect and repair fatigue cracking in certain lap joints, which will ensure safe operation of airplanes that have exceeded their economic design goal.
AD 94-12-05 · published Jun 13, 1994, effective Jul 13, 1994
The Boeing Company Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to all McDonnell Douglas Model DC-10 series airplanes and Model KC-10A (military) airplanes, that requires inspections to detect cracks in wing stringer number 41; installation of a repair, if necessary; and modification of that stringer. This amendment is prompted by reports of fatigue cracks in outer wing stringer number 41. The actions specified by this AD are intended to prevent reduced structural integrity of the wing.
AD 94-12-09 · published Jun 13, 1994, effective Jul 13, 1994
The Boeing Company Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 747 series airplanes, that requires inspections to detect fatigue-related skin cracks and corrosion of the skin lap joints in the fuselage upper lobe, and repair, if necessary. This amendment also requires modification of certain lap joints and inspections of modified lap joints. This amendment is prompted by a structural review of Model 747 series airplanes. The actions specified by this AD are intended to prevent rapid decompression of the airplane and the inability to carry fail-safe loads, due to the problems associated with fatigue cracking and corrosion.
AD 94-10-04 · published Jun 15, 1994, effective Jun 15, 1994
BAE Systems (Operations) Limited Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain Jetstream Model 4101 airplanes, that requires a visual inspection of an area beneath the flooring for foreign objects and debris, removal of any foreign object or debris found, and installation of a protective guard on the rear cabin attendant seat. This amendment also requires a revision to the FAA-approved maintenance program to include repetitive visual inspections of the area above the protective guard for foreign objects and debris, and removal of any foreign object or debris found. This amendment is prompted by reports that foreign objects and debris have been found in the area around the elevator and rudder trim cables below the floor. The actions specified by this AD are intended to prevent foreign objects and debris from lodging in the control circuits and jamming the elevator and rudder trim systems.
AD 94-12-11 · published Jun 15, 1994, effective Jun 30, 1994
The Boeing Company Airplanes
This amendment adopts a new airworthiness directive (AD) that is applicable to all Boeing Model 747-400 series airplanes. This action requires revising the Airplane Flight Manual to include procedures that will enable the flight crew to identify fuel system leaks and to take appropriate action to prevent further fuel loss. This amendment is prompted by reports that flight crew procedures related to fuel system leaks are not defined adequately in the FAA-approved AFM for these airplanes. The actions specified in this AD are intended to ensure that the flight crew is advised of the potential hazard related to fuel exhaustion due to undetected leakage, and the procedures necessary to address it.
AD 94-09-14 · published Jun 17, 1994, effective Jun 17, 1994
Saab AB, Saab Aerosystems Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain SAAB Model SAAB 340B series airplanes, that requires replacement of the existing actuator assembly on the motor operated fuel valve assembly with a new, improved actuator assembly. This amendment is prompted by electromagnetic interference (EMI) tests, which indicate that the actuator assemblies of certain fuel shut-off valves may fail to function after exposure to EMI, such as lightning or high intensity radiated fields. The actions specified by this AD are intended to prevent loss of function of the fuel shut-off valves, which could result in unchecked fuel leakage or fuel imbalance after fuel system failure.
AD 94-12-10 · published Jun 20, 1994, effective Feb 24, 1994
The Boeing Company Airplanes
This amendment supersedes an existing airworthiness directive (AD), applicable to certain Boeing Model 767 series airplanes, that currently requires repetitive inspections, tests, adjustments, and functional checks of the thrust reverser system and of selected engine wiring. This amendment adds a requirement for installation of a terminating modification, repetitive operational checks of that installation, and repair of any discrepancy found. This amendment is prompted by the identification of a modification that ensures that the level of safety inherent in the original type design of the thrust reverser system is further enhanced. The actions specified by this AD are intended to prevent deployment of a thrust reverser in flight and subsequent reduced controllability of the airplane.
AD 94-12-12 · published Jun 20, 1994, effective Jul 20, 1994
The Boeing Company Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 737-300 series airplanes, that requires replacement of the forward and aft hinge shims and the lower hinge fairings of the main cargo door with new shims and fairings. This amendment is prompted by reports of a slight separation between the end hinge shims and the cargo door; this separation can cause bending loads on the fasteners. The actions specified by this AD are intended to prevent fatigue failure of the hinge fasteners, loss of structural integrity of the cargo door hinge, possible loss of the cargo door, and subsequent rapid decompression of the airplane.
AD 94-13-07 · published Jun 23, 1994, effective Jul 8, 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 inspections and replacement or reidentification and reinstallation of certain aft engine mount link assemblies. This amendment is prompted by reports of cracking in the aft engine mount link assemblies of airplanes having link assemblies identical to those installed on Model MD-11 series airplanes. The actions specified in this AD are intended to prevent loss of the aft engine mount capability to support engine loads, and possible separation of the engine from the airplane.
AD 94-13-06 · published Jun 27, 1994, effective Jul 27, 1994
The Boeing Company Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 747 series airplanes, that requires inspections to detect cracking in certain fuselage upper deck tension ties, and repair or modification of any cracked tension ties. This amendment is prompted by reports of fatigue cracking in tension ties. The actions specified by this AD are intended to prevent failure of two or more tension ties and the resultant rapid decompression of the airplane.
AD 94-13-10 · published Jun 27, 1994, effective Aug 12, 1994
Piper Aircraft Inc. Airplanes
This amendment supersedes Airworthiness Directive (AD) 74-13-01, which currently requires inspecting (one-time) the stabilator torque tube bearing support fittings for looseness on certain Piper Aircraft Corporation (Piper) PA24, PA30, and PA39 series airplanes, and, if looseness is found, incorporating Piper Part No. 760 835 (Hi-Shear Rivet Replacement Kit). This action retains the initial inspection of the stabilator torque tube bearing support fittings, and makes these inspections repetitive unless the above referenced service kit is incorporated. Incidents of looseness of the stabilator torque tube bearing support fittings on several of the affected airplanes in compliance with the current AD prompted this action. The actions specified by this AD are intended to prevent loss of pitch control because of looseness of the stabilator torque tube bearing support fittings, which could result in loss of control of the airplane.
AD 94-13-11 · published Jun 27, 1994, effective Aug 12, 1994
Piper Aircraft Inc. Airplanes
This amendment adopts a new airworthiness directive (AD) that applies to certain Piper Aircraft Corporation (Piper) Models PA34-200, PA34-200T, PA34-220T, PA44-180, and PA44-180T airplanes. This action requires repetitively inspecting the main landing gear trunnions for cracks, replacing any trunnions found cracked, and eventually replacing these trunnions with improved parts as terminating action for the repetitive inspection requirement. Several reports of the main landing gear trunnions cracking on the affected airplanes prompted this action. The actions specified by this AD are intended to prevent collapse of the main landing gear caused by cracked trunnions, which could result in airplane damage.
AD 94-10-51 · published Jun 28, 1994, effective Jun 28, 1994
Airbus Airplanes
This document publishes in the Federal Register an amendment adopting Airworthiness Directive (AD) T94-10-51 that was sent previously to all known U.S. owners and operators of certain Airbus Model A300, A300-600, and A310 series airplanes by individual telegrams. This AD requires a detailed visual inspection to detect cracks, delamination, or discoloration of the bus bar of certain aft fixed side cockpit windows; and deactivation of the window heating system and repetitive detailed visual inspections, or replacement of the window with a modified window, if necessary. This amendment is prompted by a report of fracture of a fixed cockpit window that led to electrical arcing in the bus bar area of the window heating system on a Model A300 series airplane. The actions specified by this AD are intended to prevent decompression of the fuselage during flight due to failure of a window.
AD 94-14-01 · published Jun 30, 1994, effective Aug 1, 1994
The Boeing Company Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 767 series airplanes, that requires replacement of the thrust reverser flow restrictor devices with one-way (check) valve restrictors. This amendment is prompted by reports of piston seal leakage found during actuator overhaul on certain Model 767 series airplanes. The actions specified by this AD are intended to prevent possible deployment of a thrust reverser in flight and subsequent reduced controllability of the airplane.
AD 94-14-02 · published Jun 30, 1994, effective Aug 1, 1994
The Boeing Company Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 757 series airplanes, that requires tests of the thrust reverser system, and repair, if necessary; installation of a modification that would terminate those tests; and repetitive operational checks of that installation, and repair, if necessary. This amendment is prompted by results of a safety review, which revealed that in-flight deployment of a thrust reverser could result in a significant reduction in the controllability of the airplane. The actions specified by this AD are intended to prevent deployment of a thrust reverser in flight and subsequent reduced controllability of the airplane.
AD 94-14-14 · published Jun 30, 1994, effective Aug 19, 1994
Piper Aircraft Inc. Airplanes
This amendment adopts a new airworthiness directive (AD) that applies to certain Piper Aircraft Corporation (Piper) PA28R, PA28RT, and PA44 series airplanes. This action requires installing a certain nose landing gear modification kit. Several service difficulty reports of collapsed nosegear on the affected airplanes prompted this action. In particular, these reports reveal failure of the bolt (AN4-20) connecting the lower drag link of the nosegear to the upper drag link. The actions specified by this AD are intended to prevent nose gear collapse because of AN4-20 bolt failure, which could lead to airplane damage.
AD 94-12-07 · published Jun 27, 1994, effective Aug 1, 1994
Sikorsky Aircraft Corporation Helicopters
This amendment supersedes an existing airworthiness directive (AD), applicable to Sikorsky Aircraft Model S-58T series helicopters, that currently requires a one-time inspection of the engine drive shaft assembly (drive shaft assembly) for cracks and loose balance weights. This amendment requires initial and repetitive visual and florescent penetrant inspections of the drive shaft assembly for cracks and improperly installed rivets. This amendment is prompted by three reported incidents of loose or missing drive shaft assembly balance weights and two reported incidents of fatigue cracks on the drive shaft assembly near the balance weight rivet hole. The actions specified by this AD are intended to prevent failure of the drive shaft assembly, loss of power to the rotor system, and a subsequent forced landing of the helicopter.
AD 94-11-11 · published Jun 23, 1994, effective Jul 25, 1994
Pratt & Whitney Canada Corp. Engines
This amendment supersedes an existing airworthiness directive (AD), applicable to Pratt & Whitney Canada PW100 series turboprop engines, that currently requires rework or replacement of the intercompressor case (ICC), and replacement of the low pressure rotor speed (NL) sensor port sealing tube and the external air tube connecting the P2.5/P3 switching valve to the rear inlet case. This amendment additionally requires installation of an airflow deflector bracket nozzle assembly, or modification of the No. 5 bearing pressure air system. Finally, this action requires installation of a No. 5 bearing vent tube assembly and allows extension of the compliance interval for reworking or replacing the ICC. This amendment is prompted by the development of additional hardware that will further reduce the risk of internal oil fires in the ICC. The actions specified by this AD are intended to prevent fire in the engine ICC and nacelle cavities, inflight engine shutdown, and aircraft damage.
AD 94-14-12 · published Jun 23, 1994
Teledyne Continental Motors Engines
AD 94-10-01 · published Jun 22, 1994, effective Jun 22, 1994
Hartzell Propeller, Inc. Propellers
AD 94-14-03 · published Jun 30, 1994, effective Aug 1, 1994
Airbus, The Boeing Company, Bombardier Inc., Dassault Aviation, Fokker Services, Gulfstream Aerospace Corporation, Lockheed Martin Corporation, Nordskog Industries, Inc. Appliances
This amendment adopts a new airworthiness directive (AD), applicable to certain Nordskog water heaters and coffee makers. This amendment requires an inspection to determine whether certain discrepant pressure relief valves have been installed in certain galley water heaters and coffee makers; and either replacement of the discrepant valves, or discontinued use of the water heaters or coffee makers and installation of placards indicating that these units are not to be used. This amendment is prompted by reports of injuries to cabin crew members that resulted from explosions of galley water heaters. The actions specified by this AD are intended to prevent explosions of galley water heaters and coffee makers, and subsequent injuries to passengers or cabin crew members.
