25 Airworthiness Directives: 16 airplane, 2 rotorcraft, 5 engine, 2 appliance.
AD 94-24-03 · published Dec 2, 1994, effective Jan 3, 1995
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, KC-10A (military) airplanes, and Model MD-11 series airplanes, that requires the installation of retainers and supports at the lateral control mixer bracket on the center of the wing rear spar of the airplane. This amendment is prompted by an analysis conducted by the manufacturer, which revealed that failure of a lateral control mixer bracket could result in uncommanded deployment of the spoiler. The actions specified by this AD are intended to prevent inadvertent asymmetric deployment of the spoiler, which may lead to reduced controllability of the airplane.
AD 94-24-05 · published Dec 5, 1994, effective Jan 4, 1995
Short Brothers PLC Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain Short Brothers Model SD3-60 series airplanes, that requires installation of a certain time delay relay and associated wiring into a circuit of the rudder gust lock. This amendment is prompted by reports of inadvertent engagements of the rudder gust lock on in-service Model SD3-60 series airplanes. The actions specified by this AD are intended to prevent premature locking of the rudder gust lock, which could result in reduced controllability of the airplane in flight and during landing roll.
AD 94-24-06 · published Dec 5, 1994, effective Jan 4, 1995
Textron Aviation Inc. Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to all Raytheon Corporate Jets Model BH/HS 125-600A and -700A series airplanes, that requires installation of two new circuit breakers in the 6 volt output circuits of the flight deck lighting transformers on electrical Panel 'RY,' below the right pilot's seat. This amendment is prompted by a report of smoke in the flight deck due to a lighting transformer 6 volt output circuit short circuiting to ground. The actions specified by this AD are intended to prevent smoke or fire in the flight deck due to inadequate circuit protection for 6 volt circuits of the flight deck lighting transformer.
AD 94-24-08 · published Dec 5, 1994, effective Jan 4, 1995
Textron Aviation Inc. Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to Raytheon Corporate Jets Model BAe 125-1000A and Hawker 1000 series airplanes, that requires installation of additional vent areas in the central fuselage. This amendment is prompted by an analysis which indicated that an explosive decompression could not be vented adequately with the currently installed floor venting system on these airplanes. The actions specified by this AD are intended to prevent collapse of the floor and subsequent injury to passengers and crew in the event of an explosive decompression of the fuselage.
AD 94-24-10 · published Dec 7, 1994, effective Jan 6, 1995
Saab AB, Saab Aerosystems Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain Saab Model SAAB SF340A and SAAB 340B airplanes, that requires repetitive inspections to detect cracking of the tray stop spindle and backrest spindle bosses on the inboard sections of certain seats; and replacement of the inboard sections, if necessary. This amendment also requires repair and identification of the modification plate, which would terminate the requirement to inspect repetitively. This amendment is prompted by reports of fatigue cracking in the vicinity of the tray stop spindle and backrest spindle bosses, which could lead to excessive movement and eventual failure of the backrest on these seats during aft loading. The actions specified by this AD are intended to prevent failure of the backrest on these seats, which could inhibit emergency egress.
AD 94-22-05 · published Dec 12, 1994, effective Dec 12, 1994
Various Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain Fokker Model F28 Mark 0100 series airplanes, that requires inspections to detect cracks of certain demountable flange (inboard) wheel subassemblies and of the bolt bosses on certain demountable flange (outboard) wheel subassemblies, and modification or replacement of the wheel subassemblies. This amendment is prompted by reports of cracks and broken spokes found on certain main wheel assemblies of these airplanes. The actions specified by this AD are intended to prevent loss of a main wheel assembly during takeoff or landing.
AD 94-22-06 · published Dec 12, 1994, effective Dec 12, 1994
Bombardier Inc. Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain Bombardier Model CL-600-2B19 series airplanes, that requires modification of the stall protection system (SPS) input wiring; a revision to the FAA-approved Airplane Flight Manual (AFM) to specify that a pre-flight check of the slip/skid indications must be conducted prior to engine start; and modification of the stall protection computer (SPC) to accept restored dual attitude and heading reference system (AHRS) input. This amendment is prompted by a report that the AHRS could send conflicting input to the SPC on the airplane. The actions specified by this AD are intended to prevent the loss of stall warning protection on the airplanes.
AD 94-24-02 · published Dec 14, 1994, effective Dec 14, 1994
Bombardier Inc. Airplanes
This amendment supersedes an existing airwothiness directive (AD), applicable to certain Canadair Model CL-600-2B19 series airplanes, that currently requires a revision to the FAA- approved Airplane Flight Manual (AFM) to restrict altitude and airspeed operations of the airplane under certain conditions of hydraulic system failure. This amendment requires the removal of all elevator flutter dampers and requires a revision to the AFM that advises the flight crew of the need to perform daily checks to verify proper operation of the elevator control system. This amendment is prompted by reports that the installation of the stronger shear pins may jam or restrict movement of the elevator. The actions specified in this AD are intended to prevent failure of the lugs and/or pins, which may increase the likelihood of jamming or restricting movement of the elevator and the resultant adverse affect on the controllability of the airplane.
AD 94-25-06 · published Dec 15, 1994, effective Jan 17, 1995
The Boeing Company Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain Model DC-9-80 series airplanes and Model MD-88 airplanes, that requires modification of the engine nose cowls. This amendment is prompted by several in-flight incidents in which the engine nose cowl separated or nearly separated from the airplane. The actions specified by this AD are intended to prevent separation of the engine nose cowl from the airplane during severe vibration of the engine.
AD 94-23-06 · published Dec 21, 1994, effective Dec 21, 1994
Airbus SAS Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain Airbus Model A320-111, -211, and -231 airplanes, that requires modification of the currently installed one-stage shock absorbers on the main landing gear to two-stage shock absorbers. This amendment is prompted by the results of an evaluation of the air-to-ground sensing logic relative to the operation of other airplane systems during landing in adverse weather conditions. The actions specified by this AD are intended to prevent a delay in sensing by the air-to-ground logic system that the airplane is on the ground, which could prevent the airplane from achieving the landing distances specified in the FAA-approved Airplane Flight Manual (AFM).
AD 94-25-03 · published Dec 21, 1994, effective Dec 21, 1994
Fokker Services Airplanes
This amendment adopts a new airworthiness directive (AD) that is applicable to all Fokker Model F28 series airplanes. This action requires a revision to the Airplane Flight Manual that prohibits takeoff in certain icing conditions unless either a tactile inspection is performed or specific takeoff procedures are followed. This amendment is prompted by several accidents in which Fokker Model F28 series airplanes lost aerodynamic lift when attempting takeoff with ice contamination on their wings. The actions specified in this AD are intended to prevent degradation of aerodynamic lift during takeoff when icing conditions exist.
AD 94-25-01 · published Dec 22, 1994, effective Dec 22, 1994
The Boeing Company Airplanes
AD 94-25-02 · published Dec 22, 1994, effective Dec 22, 1994
BAE Systems (Operations) Limited Airplanes
This amendment adopts a new airworthiness directive (AD) that is applicable to certain Jetstream Model ATP airplanes. This action requires inspections to detect cracking in certain oil coolers, and replacement of cracked coolers with serviceable coolers. The amendment also provides for termination of the inspections by installing certain reworked and re-identified oil coolers. This amendment is prompted by reports of cracking in the welded seams of certain oil coolers. The actions specified in this AD are intended to prevent loss of engine oil due to cracking in the oil cooler, which may lead to a forced shutdown of the engine.
AD 94-25-12 · published Dec 27, 1994, effective Jan 26, 1995
Textron Aviation Inc. Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain Raytheon Corporate Jets Model BAe 125-1000A series airplanes, that requires modification of the galley feeder cables and toilet services fuse. This amendment is prompted by a report that the gauge size of the existing galley feeder cable is not compatible with the rating of the currently used toilet services fuse. The actions specified by this AD are intended to ensure that the subject cables are compatible with the toilet services fuse in order to prevent overheating of the cables, which could result in smoke and fire in the cabin.
AD 94-26-02 · published Dec 27, 1994, effective Jan 26, 1995
Bombardier Inc. Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain de Havilland Model DHC-8 series airplanes, that requires repetitive inspections of the passenger service unit (PSU) printed circuit boards and power supply connectors to detect corrosion and evidence of overheating; repair or replacement of the circuit boards or replacement of connectors, if necessary; and eventual installation of a terminating modification. This amendment is prompted by reports that certain PSU printed circuit boards and power supply connectors have overheated in service. The actions specified by this AD are intended to prevent overheating of the PSU printed circuit board and power supply connectors, which could lead to a fire in the PSU.
AD 94-25-10 · published Dec 28, 1994, effective Dec 28, 1994
Hawker Beechcraft Corporation Airplanes
This amendment adopts a new airworthiness directive (AD) that is applicable to all Beech Model 400, 400A, 400T, and MU-300-10 airplanes, and all Mitsubishi Model MU-300 airplanes. This action requires a revision to the Airplane Flight Manual that provides pilots with special operating procedures during icing conditions. This amendment is prompted by the results of icing tests, which demonstrated that ice accumulations on the horizontal stabilizer may cause the airplane to pitch down at certain flaps settings. The actions specified in this AD are intended to prevent uncommanded nose-down pitch at certain flap settings during icing conditions.
AD 94-22-04 · published Dec 1, 1994, effective Dec 1, 1994
Agusta S.p.A. Helicopters
This amendment supersedes an existing airworthiness directive (AD), applicable to Costruzioni Aeronautiche Giovanni Agusta S.p.A. Model A109A and A109AII series helicopters, that currently imposes a calendar life limit of 10 years and 6 months on the main rotor retention strap assemblies (strap assemblies). This amendment requires reducing the calendar life limit to 8 years. This amendment is prompted by additional service experience and analyses, that show the current life limit needs to be reduced from 10 years and 6 months to 8 years to prevent deterioration and subsequent failure of the strap assemblies. The actions specified by this AD are intended to prevent failure of the strap assemblies, loss of a main rotor blade, and subsequent loss of control of the helicopter.
AD 94-26-10 · published Dec 27, 1994, effective Jan 11, 1995
Robinson Helicopter Company Helicopters
This amendment supersedes an existing airworthiness directive (AD), applicable to Robinson Helicopter Company (RHC) Model R44 series helicopters, that currently requires removal and replacement of specific parts of the cyclic control system. This amendment requires the same removal and replacement of specific parts of the cyclic control system, corrects a replacement part number, and changes the applicability to cover certain serial-numbered helicopters. This amendment is prompted by the need to correct the existing AD by changing the applicability to include additional serial-numbered helicopters and to correct a replacement part number that was incorrectly stated in the existing AD. The actions specified by this AD are intended to prevent failure of the cyclic control system and subsequent loss of control of the helicopter.
AD 94-23-05 · published Dec 1, 1994, effective Dec 1, 1994
Honeywell International Inc. Engines
This amendment adopts a new airworthiness directive (AD) that is applicable to AlliedSignal Inc., (formerly Garrett Engine Division) TFE731-3A-200G and -3AR-200G model turbofan engines. This action requires removing from service certain low pressure turbine (LPT) disks, imposing an hourly life limit on the first stage and second stage LPT disks, performing a dimensional inspection of second stage LPT disks at repetitive intervals, and incorporating honeycomb material in the second stage LPT nozzle air seal. This amendment is prompted by reports of LPT disk web separations. The actions specified in this AD are intended to prevent LPT disk web separations, which can result in an uncontained engine failure and damage to the aircraft.
AD 94-23-04 · published Dec 7, 1994, effective Feb 6, 1995
Honeywell International Inc. Engines
This amendment adopts a new airworthiness directive (AD), applicable to Garrett Turbine Engine Company ATF3 series turbofan engines, that requires a one-time inspection for cracks of the curvic and bore area of the high pressure turbine (HPT) rotor assembly disk, and replacement, if necessary, with a serviceable disk. This amendment is prompted by several reports of cracks discovered during routine inspections of HPT rotor assembly disks. The actions specified by this AD are intended to prevent an uncontained failure of the HPT rotor assembly disk.
AD 94-23-09 · published Dec 7, 1994, effective Jan 6, 1995
Rolls-Royce Deutschland Ltd & Co KG Engines
This amendment supersedes telegraphic airworthiness directive (AD) T89-02-52, which superseded Telegraphic AD T88-22-51 (AD), applicable to Rolls-Royce, plc (R-R) Spey series turbofan engines. Telegraphic AD T88-22-51 reduced cyclic life limits for seventh stage high pressure compressor (HPC) disks from 40,000 total part cycles in service (TPC) to 35,000 TPC for the R-R Spey Model 506-14 and -14D engines. Telegraphic AD T89-02-52 currently requires repetitive inspections or further reduced cyclic life limits for seventh stage HPC disks. This amendment increases the AD's effectivity to include additional R-R Spey engine models, eliminates the option for repetitive inspections, and further reduces the cyclic life limits. This amendment is prompted by further investigation into disk bore cracking that was caused by corrosion. The actions specified by this AD are intended to prevent a seventh stage HPC disk burst due to cracking attributed to corrosion, which may result in an uncontained engine failure. The incorporation by reference of certain publications listed in the regulations is approved by the Director of the Federal Register as of January 6, 1995.
AD 94-25-08 · published Dec 15, 1994, effective Jan 17, 1995
Turbomeca S.A. Engines
This amendment supersedes an existing airworthiness directive (AD), applicable to Turbomeca Arriel 1 series turboshaft engines, that currently requires a gearbox chip detector inspection prior to further flight, subsequent inspection at designated intervals, and if necessary, removal of the gearbox, and also requires modification of the gearbox if not accomplished previously. This amendment requires modification to the intermediate gear that would constitute terminating action to the repetitive chip detector inspections. On certain engines this amendment requires immediate modification of the intermediate gear prior to further flight. This amendment is prompted by the availability of design improvements to the intermediate gear. The actions specified by this AD are intended to prevent damage to the aircraft resulting from engine debris following an uncontained engine failure.
AD 94-25-09 · published Dec 19, 1994, effective Feb 17, 1995
Rolls-Royce Deutschland Ltd & Co KG Engines
This amendment adopts a new airworthiness directive (AD), applicable to Rolls-Royce, plc Spey series turbofan engines, that requires a one-time inspection of stage 1 and stage 2 high pressure turbine (HPT) and low pressure turbine (LPT) disks for cracks and corrosion pitting. This amendment is prompted by a report of a stage 7 high pressure compressor disk found cracked due to corrosion. The actions specified by this AD are intended to prevent an HPT or LPT disk burst due to cracking attributed to corrosion, which may result in an uncontained engine failure. The incorporation by reference of certain publications listed in the regulations is approved by the Director of the Federal Register as of February 17, 1995.
AD 94-25-04 · published Dec 15, 1994, effective Feb 13, 1995
Precision Airmotive Corporation Appliances
This amendment adopts a new airworthiness directive (AD), applicable to certain Precision Airmotive Corporation (formerly Facet Aerospace Products and Marvel-Schebler) Model HA-6 series carburetors, that requires a modification in those carburetors not equipped with a mixture control retainer clip. This amendment is prompted by eight reports of excessive retention screw wear causing rough engine operation or engine power loss on engines equipped with a Model HA-6 series carburetor between January 1986 and August 1992. The actions specified by this AD are intended to prevent the interruption of fuel flow to the engine caused by the mixture control shaft moving out of position because of excessive wear of the mixture control shaft retention screw.
AD 95-01-01 · published Dec 29, 1994, effective Feb 6, 1995
Terra Corporation Appliances
This amendment adopts a new airworthiness directive (AD), applicable to Terra Corporation TRT 250 series transponders, that requires removing the transponder from the aircraft, inspecting it to determine if the AD applies, and replacing any affected transponder with a modified Terra Corporation transponder or another transponder that responds properly to Mode S interrogations from both an Air Traffic Control Radio Beacon System (ATCRBS)/Mode S ground station and Traffic Collision Avoidance System (TCAS) II airborne equipment. This amendment is prompted by FAA tests that show that the transponder does not respond properly to certain interrogations by a Mode S or TCAS II signal. The actions specified by this AD are intended to prevent failure of the transponder to respond properly to Mode S interrogations from both Mode S ground stations and TCAS II airborne equipment, which could result in loss of airspace separation.
