18 Airworthiness Directives: 11 airplane, 2 rotorcraft, 3 engine, 2 appliance.
AD 94-20-10 · published Oct 4, 1994, effective Oct 31, 1994
The Boeing Company Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain McDonnell Douglas Model DC-10-10, -15, -30, and -40 series airplanes and KC-10A (military) airplanes, that requires inspections to detect fatigue-related cracking in certain areas of the horizontal stabilizer; and repair of cracked parts. It also requires installation of terminating modifications, which, when accomplished, would eliminate the repetitive inspections. This amendment is prompted by reports of fatigue-related cracks found on the horizontal stabilizer. The actions specified by this AD are intended to prevent loss of the load carrying and fail safe capability of the horizontal stabilizer, damage to the adjacent structure, and subsequent reduced structural integrity of the airplane, due to the problems associated with fatigue cracking.
AD 94-19-05 · published Oct 6, 1994, effective Oct 6, 1994
Airbus SAS Airplanes
This amendment adopts a new airworthiness directive (AD) that is applicable to certain British Aerospace Model BAC 1-11-200 and -400 series airplanes. This action requires revising the Limitations Section of the FAA-approved Airplane Flight Manual (AFM) to limit reversion of the flight controls to manual (unpowered) operation. This action also provides optional terminating action for the AFM limitation. This amendment is prompted by reports of cracking of certain brackets and levers in the primary flight control system due to residual stresses, mechanical loading, and material properties changes associated with aging. The actions specified in this AD are intended to prevent loss of integrity of the primary flight control system due to structural failure of the brackets or levers.
AD 94-19-51 R1 · published Oct 7, 1994, effective Oct 24, 1994
The Boeing Company Airplanes
This document revises and publishes in the Federal Register an amendment adopting Airworthiness Directive (AD) T94-19-51 that was sent previously to all known U.S. owners and operators of McDonnell Douglas Model MD-11 and MD-11F series airplanes by individual telegrams. This AD supersedes an existing airworthiness directive that currently requires a revision to the Airplane Flight Manual (AFM) to ensure that the flight crews verify the accuracy of data provided by the Flight Management Computer (FMC) under certain conditions. This amendment requires a revision to the AFM to ensure that the flight crews verify the accuracy of data provided by the FMC under all conditions. This amendment is prompted by a report that the "check/confirm V speed" message may be inhibited when the flaps are extended to within three degrees of the takeoff flap setting that was entered into the FMC. The actions specified by this AD are intended to prevent FMC miscalculations that may result in excessively high takeoff decision (V1) speeds, which may adversely affect accelerate-stop distances and may lead to the failure of the airplane to stop prior to departing the end of the runway during a high speed rejected takeoff. This amendment also revises the previously issued telegraphic AD by correcting a typographical error in the listing of the part numbers for the FMC's.
AD 94-17-14 · published Oct 11, 1994, effective Oct 11, 1994
BAE Systems (Operations) Limited Airplanes
This amendment supersedes an existing airworthiness directive (AD), applicable to British Aerospace Model BAe 146-100A, -200A, and -300A series airplanes, that currently requires replacing the quick release coupling halves on each end of the pump case drain line on the hydraulic engine driven pump (EDP) on the number 2 and number 3 engines with improved fire resistant coupling halves. This amendment revises the applicability of the existing AD. This amendment is prompted by the identification of additional airplanes that are subject to the addressed unsafe condition. The actions specified by this AD are intended to prevent hydraulic fluid leakage from the pump case drain line quick release coupling, which could fuel the flames in the event of an engine fire.
AD 94-18-02 · published Oct 11, 1994, effective Oct 11, 1994
Airbus Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to Airbus Industrie Model A300 series airplanes, that requires the implementation of a corrosion prevention and control program, either by revising the maintenance program or by accomplishing specific inspection procedures. This amendment is prompted by reports of incidents involving corrosion and fatigue cracking in transport category airplanes that are approaching or have exceeded their economic design goal; these incidents have jeopardized the airworthiness of the affected airplanes. The actions specified by this AD are intended to prevent degradation of the structural capabilities of the airplane due to the problems associated with corrosion.
AD 94-21-01 · published Oct 13, 1994, effective Nov 14, 1994
Bombardier Inc. Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain de Havilland Model DHC-8-100 series airplanes, that requires modification of the potentiometer lever stops on the nose wheel steering. This amendment is prompted by a report that the potentiometer stops installed currently on these airplanes are too short to limit excessive uncontrolled potentiometer movement in the event of a mechanical link failure. The actions specified by this AD are intended to prevent the airplane from departing the runway during takeoff or landing in the event of the failure of the mechanical link between the rudder pedals and the potentiometer.
AD 94-19-03 · published Oct 21, 1994, effective Oct 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 autopilot disconnect switches with modified units. This amendment is prompted by several incidents in which the flight crew did not depress both halves of the autopilot disconnect switch during the LAND 2 or LAND 3 approach and, as a result, one autopilot remained engaged. This condition resulted in unanticipated movements of the stabilizer trim and higher than anticipated control forces of the flight controls. The actions specified by this AD are intended to prevent the flight crew from inadvertently disconnecting only one autopilot when both autopilots are engaged, which could result in unanticipated control surface movements.
AD 94-20-11 · published Oct 25, 1994, effective Nov 25, 1994
The Boeing Company Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 747-400 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 actuator piston seal leakage found during actuator overhaul on certain Model 747-400 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 94-21-02 · published Oct 26, 1994, effective Oct 26, 1994
328 Support Services GmbH Airplanes
This amendment adopts a new airworthiness directive (AD) that is applicable to all Dornier Model 328-100 airplanes. This action requires repetitive tightening of the screws and quick-release fasteners on the wing/body fairing panels. This amendment is prompted by reports of loosened wing/body fairing panels. The actions specified in this AD are intended to prevent structural damage to the horizontal or vertical stabilizer and potential injury to persons on the ground due to loosened wing/body fairing panels that may separate from the airplane.
AD 94-22-01 · published Oct 27, 1994, effective Nov 28, 1994
The Boeing Company Airplanes
This amendment supersedes an existing airworthiness directive (AD), applicable to all McDonnell Douglas Model DC-10-10, -10F, -30, and -30F series airplanes, that currently requires inspections to detect ice or snow accumulation on top of the fuselage and in the inlet of the number 2 engine, and removal of ice and snow accumulation. This amendment adds certain airplanes to the applicability of the rule and limits the inspection requirement to only a certain group of airplanes. This amendment is prompted by the development of improved fan blades on certain engines and the identification of additional airplanes that are subject to the unsafe condition. The actions specified by this AD are intended to minimize damage to the number 2 engine due to ingestion of ice and snow.
AD 94-20-03 · published Oct 11, 1994, effective Oct 11, 1994
Bell Helicopter Textron Canada Limited Helicopters
This amendment supersedes an existing airworthiness directive (AD) applicable to Bell Helicopter Textron, Inc. (BHTI) Model 206A, 206B, 206B-1, 206L, 206L-1, 206L-3, and 206L-4 helicopters, that currently requires an inspection of the main rotor hub trunnion (trunnion) for a mislocated master spline and replacement of any trunnion that has a mislocated master spline. This amendment is prompted by a report that certain main rotor hub trunnions (trunnions) were manufactured with a mislocated master spline. The actions specified by this AD are intended to identify and require replacement of any trunnion with a mislocated master spline to prevent pitch link misalignment, altered cyclic stick control position, loss of the main rotor system, and subsequent loss of control of the helicopter.
AD 94-18-09 · published Oct 14, 1994, effective Oct 14, 1994
Bell Helicopter Textron, Inc. Helicopters
This amendment adopts a new airworthiness directive (AD), applicable to Bell Helicopter Textron, Inc. Model 205A, 205A-1, 205B, 212, and 412 series helicopters, that requires removal and replacement of a certain design main transmission lower planetary spider (spider), and establishes a 2,500 hours time-in-service retirement life for the spider. This amendment is prompted by five failures of the spider that occurred during the manufacturer's fatigue tests. The actions specified by this AD are intended to prevent fatigue failure of the spider, failure of the main transmission, and subsequent loss of control of the helicopter.
AD 94-20-09 · published Oct 13, 1994, effective Nov 14, 1994
Pratt & Whitney Division Engines
This amendment supersedes an existing airworthiness directive (AD), applicable to certain Pratt & Whitney (PW) JT8D series turbofan engines, that currently requires initial and repetitive inspections of installed third and fourth stage low pressure turbine (LPT) blade sets for blade shroud crossnotch wear, and removal of blade sets found with excessively worn blade shroud crossnotches. This amendment continues to require inspections, and removal, if necessary, of blade sets, but also requires, as a terminating action to the inspections: installation of improved LPT containment hardware, installation of an improved No. 6 bearing scavenge pump bracket bushing, and modification and remarking with a new identification number third and fourth stage LPT vanes with a reduced platform leading edge dimension. This amendment is prompted by reports of additional uncontained engine failures since publication of the current AD, and the availability of improved LPT containment hardware.The actions specified by this AD are intended to prevent damage to the aircraft resulting from engine debris following an LPT blade or shaft failure.
AD 93-19-02 R1 · published Oct 17, 1994, effective Oct 17, 1994
Pratt & Whitney Division Engines
AD 94-20-06 · published Oct 25, 1994, effective Dec 27, 1994
General Electric Company Engines
This amendment adopts a new airworthiness directive (AD), applicable to General Electric Company (GE) CF6-80C2 series turbofan engines, that requires a repetitive oil quantity check after engine start-up but prior to taxi, and installation of a flame arrestor plug support (FAPS) in the aft end of the center vent tube as a terminating action to the repetitive oil quantity checks. This amendment is prompted by three reports of uncontained engine failure due to separation of the fan mid shaft. The actions specified by this AD are intended to prevent an uncontained engine failure and inflight engine shutdown due to fuel contamination of the oil system.
AD 94-21-06 · published Oct 25, 1994, effective Nov 25, 1994
Pacific Scientific Company Appliances
This amendment adopts a new airworthiness directive (AD), applicable to certain Pacific Scientific lap belt assemblies and restraint systems, that requires removal of certain lap belt assemblies and restraint systems, and replacement with a differently designed assembly. This amendment is prompted by a report indicating that, subsequent to an accident involving a transport category airplane, some passengers experienced difficulty in attempting to release the buckle on their lap belts. The actions specified by this AD are intended to prevent the inability of passengers or crew to egress from their seats during an emergency situation, due to problems associated with the lap belt assembly.
AD 94-20-07 · published Oct 28, 1994, effective Dec 27, 1994
The Boeing Company, PTC Aerospace Appliances
This amendment adopts a new airworthiness directive (AD), applicable to PTC Aerospace Model 91700 passenger oxygen system, installed in PTC Aerospace Model 881, 940, and 950 seats installed on McDonnell Douglas DC-10 series aircraft. This AD requires a one-time inspection to verify the proper configuration and functioning of the passenger oxygen system, and replacement, if necessary, with serviceable parts. This amendment is prompted by oxygen canisters failing to activate due to the installation of incorrect pin release brackets or defective oxygen canister release pins. The actions specified by this AD are intended to prevent failure of the passenger oxygen system to activate.
