33 Airworthiness Directives: 20 airplane, 6 rotorcraft, 7 engine.
AD 99-03-04 · published Feb 2, 1999, effective Mar 9, 1999
Boeing Model 737-100, -200, -300, -400, and -500 Series Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to all Boeing Model 737-100, -200, -300, -400, and -500 series airplanes, that requires installation of components to provide shielding and separation of the fuel system wiring (that is routed to the fuel tanks) from adjacent wiring. This amendment also requires installation of flame arrestors and pressure relief valves in the fuel vent system. This amendment is prompted by testing results, obtained in support of an accident investigation, and by re-examination of possible causes of a similar accident. The actions specified by this AD are intended to prevent possible ignition of fuel vapors in the fuel tanks, and external ignition of fuel vapor exiting the fuel vent system and consequent propagation of a flame front into the fuel tanks.
AD 99-03-06 · published Feb 4, 1999, effective Mar 11, 1999
Short Brothers Model SD3-60 SHERPA Series Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to all Short Brothers Model SD3-60 SHERPA series airplanes, that requires a one-time visual inspection to determine the part number of the power control cable assemblies and pulleys of the engine controls; and replacement of the power control cable assemblies and pulleys (as applicable) with new parts, if necessary. This amendment is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by this AD are intended to prevent breakage of the power control cable assemblies due to the inflexible construction of the cable, which could result in loss of engine power and consequent reduced controllability of the airplane.
AD 99-03-07 · published Feb 4, 1999, effective Mar 11, 1999
Bombardier Model DHC-7 Series Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to all Bombardier Model DHC-7 series airplanes, that requires removal of all attachment bolts and pre-load indicating (PLI) washers of the wing-to-fuselage attachment fittings; a one-time visual inspection to detect corrosion of each attachment bolt; and installation of new attachment bolts and PLI washers of the wing-to- fuselage attachment fittings. This amendment is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by this AD are intended to prevent failure of the attachment bolts of the wing-to-fuselage attachment fittings due to stress corrosion cracking, which could result in reduced structural integrity of the airplane.
AD 99-03-08 · published Feb 4, 1999, effective Feb 19, 1999
Boeing Model 737-600, -700, -700IGW, and -800 Series Airplanes
This amendment adopts a new airworthiness directive (AD) that is applicable to certain Boeing Model 737-600, -700, -700IGW, and -800 series airplanes. This action requires repetitive inspections to detect discrepancies of the quick-disconnect coupling on the fuel hose, located at the fan case firewall; corrective action, if necessary; and installation of a clamp shell on the coupling to prevent separation of the coupling halves. This amendment is prompted by a report that a quick-disconnect coupling on the fuel hose on an in-service airplane was found loose and leaking fuel. The actions specified in this AD are intended to detect and correct excessive wear of the quick-disconnect coupling on the fuel hose, which could result in major fuel leakage, fire in the engine nacelle, and consequent loss of thrust from the affected engine.
AD 99-03-11 · published Feb 5, 1999, effective Mar 4, 1999
Raytheon Aircraft Company Beech Model 60 Airplanes
This amendment adopts a new airworthiness directive (AD) that applies to certain Raytheon Aircraft Company (Raytheon) Beech Model 60 airplanes. This AD requires modifying the aircraft cabin heat control wiring. This AD is the result of an incident on one of the affected airplanes where the circuit control that operates the aircraft cabin heater overheated and caused the cabin heater to shut down during in- flight operation. The actions specified by this AD are intended to prevent this circuit from overheating because of the current wiring design, which could result in possible smoke/fire if the heating system continued to operate in an ``over-temperature'' condition.
AD 99-04-01 · published Feb 9, 1999, effective Mar 16, 1999
Boeing Model 747 Series Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 747 series airplanes, that requires repetitive inspections of the outboard nacelle struts to detect fatigue cracking of the strut skin and spring beam support fittings, and to detect cracked or loose fasteners of the support fittings; and corrective actions, if necessary. This amendment also provides for optional terminating action for the repetitive inspection requirements. This amendment is prompted by reports indicating that several cracked or broken spring beam support fittings were found on the outboard nacelle struts. The actions specified by this AD are intended to detect and correct such fatigue cracking and loose fasteners, which could result in failure of the outboard nacelle struts and consequent separation of the engine.
AD 99-04-02 · published Feb 10, 1999, effective Mar 17, 1999
Construcciones Aeronauticas, S.A. (CASA), Model C-212 Series Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to all CASA Model C-212 series airplanes, that requires repetitive visual inspections for damage or ``electrical spark marks'' on the cover plates for the fuel pumps, and corrective actions, if necessary. This AD also requires modification of the fuel pump installation by incorporating a non-conductive film on the cover plate, which constitutes terminating action for this AD. This amendment is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by this AD are intended to prevent electrical shorting between the fuel pump electrical connections and the fuel pump cover plate, which could result in the ignition of fuel vapor and consequent fuel tank explosion/fire.
AD 99-04-06 · published Feb 10, 1999, effective Mar 17, 1999
McDonnell Douglas Model MD-90-30 Series Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain McDonnell Douglas Model MD-90-30 series airplanes, that requires modification of the right and left main landing gear (MLG) hydraulic damper assemblies or replacement of the MLG hydraulic damper assemblies with modified and reidentified hydraulic damper assemblies. This amendment is prompted by reports indicating that, during overhauls, the MLG hydraulic dampers assemblies failed or had damaged spring retainers due to insufficient material thickness of the spring retainers. The actions specified by this AD are intended to prevent failure of the hydraulic damper assemblies of the MLG, which could result in vibration damage and collapse of the MLG.
AD 99-04-07 · published Feb 10, 1999, effective Feb 25, 1999
Saab Model SAAB SF340A and SAAB 340B Series Airplanes
This amendment adopts a new airworthiness directive (AD) that is applicable to certain Saab Model SAAB SF340A and SAAB 340B series airplanes. This action requires a review of the airplane maintenance records to identify the bottom engine vibration isolator, an inspection of the aft engine vibration isolator to determine whether the deflection is within limits, and various follow-on actions. This amendment is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified in this AD are intended to prevent excessive engine vibration, which could lead to damage of the nacelle structure and result in reduced structural integrity and fire shielding capability of the nacelle structure, or which could lead to chafing of the fire sensor loop and a consequent nuisance fire warning and result in a precautionary engine shutdown.
AD 99-04-08 · published Feb 10, 1999, effective Mar 26, 1999
Raytheon Aircraft Company Models 1900, 1900C, and 1900D Airplanes
This amendment adopts a new airworthiness directive (AD) that applies to certain Raytheon Aircraft Company (Raytheon) Models 1900, 1900C, and 1900D airplanes. This AD requires inspecting the main landing gear hydraulic actuators to determine whether a certain Frisby Aerospace actuator is installed, and reworking or replacing any of these Frisby Aerospace actuators. This AD is the result of reports of fatigue cracks in the end cap of main landing gear hydraulic actuators manufactured by Frisby Aerospace and installed on the affected airplanes. The actions specified by this AD are intended to prevent the main landing gear from failing to lock down due to the hydraulic actuator cracking and separating, which could result in loss of control of the airplane during landing, taxi, or ground operations.
AD 99-04-10 · published Feb 11, 1999, effective Mar 18, 1999
Transport Category Airplanes Equipped With Day-Ray Products, Inc., Fluorescent Light Ballasts
This amendment adopts a new airworthiness directive (AD), applicable to any transport category airplane that is equipped with certain Day-Ray fluorescent light ballasts installed in the upper and/ or lower cabin sidewall, that requires a visual inspection to determine the type of fluorescent light ballasts installed in the cabin sidewall, and the replacement of suspect ballasts with new or serviceable ballasts. This amendment is prompted by reports of smoke, fumes, and/or electrical fire emitting from the baggage bin of the aft passenger compartment due to the failure of the fluorescent light ballasts. The actions specified by this AD are intended to prevent fire in the passenger compartment resulting from failure of the fluorescent light ballast of the cabin sidewall.
AD 99-04-11 · published Feb 11, 1999, effective Mar 18, 1999
Boeing Model 737-600, -700, and -800 Series Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 737-600, -700, and -800 series airplanes, that requires repetitive inspections to detect damage of the aft strut insulation blanket. This AD also requires eventual replacement of the insulation blankets with new, improved blankets, which constitutes terminating action for the requirements of this AD. This amendment is prompted by reports of damaged aft strut insulation blankets. The actions specified by this AD are intended to prevent such damage, which could result in exposure of the lower surface of the strut to extreme high temperatures, consequent creation of a source of fuel ignition, and increased risk of a fuel tank explosion and fire.
AD 99-04-22 · published Feb 17, 1999, effective Mar 4, 1999
Boeing Model 727, 727-100, 727-200, 727C, 727-100C, and 727-200F Series Airplanes
This amendment adopts a new airworthiness directive (AD) that is applicable to all Boeing Model 727, 727-100, 727-200, 727C, 727- 100C, and 727-200F series airplanes. This action requires repetitive inspections to detect cracking of the lower skin panel at the lower row of fasteners in certain lap joints of the fuselage, and repair, if necessary. This amendment also provides for optional terminating action for certain repetitive inspections. This amendment is prompted by a report of fatigue cracking in the lower skin panel at the lower row of fasteners of the fuselage lap joints. The actions specified in this AD are intended to detect and correct such fatigue cracking, which could result in sudden fracture and failure of the lower skin lap joints, and rapid decompression of the airplane.
AD 99-04-16 · published Feb 19, 1999, effective Mar 8, 1999
Airbus Model A330 and A340 Series Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain Airbus Model A330 and A340 series airplanes. This action requires a one-time operational test to detect discrepancies of the delay valves and check valves of the main landing gear (MLG); and corrective actions, if necessary. This amendment also requires replacement of the retraction bracket assemblies of the MLG with new or reworked retraction bracket assemblies. This amendment is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified in this AD are intended to prevent failure of the retraction bracket assemblies of the MLG, which could result in an undampened extension of the MLG, damage to the sidestay and attachment structure, and possible collapse of the MLG.
AD 99-04-17 · published Feb 19, 1999, effective Mar 26, 1999
Saab Model SAAB SF340A and SAAB 340B Series Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain Saab Model SAAB SF340A and SAAB 340B series airplanes, that requires inspections to detect discrepancies of the support straps of the flaps and adjacent areas, and corrective action, if necessary. This amendment also requires replacement of the support straps with new straps made of steel. This amendment is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by this AD are intended to prevent fatigue cracking of the support straps of the flaps, which could result in further damage to the flap structure, and consequently lead to reduced controllability of the airplane.
AD 99-04-18 · published Feb 19, 1999, effective Mar 26, 1999
Airbus Model A300-600 Series Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain Airbus Model A300-600 series airplanes, that requires removal of the fuel level sensing amplifier (FLSA) of the trim tank system, modification of the polarization pin code in the electronics bay, and installation of a new, improved FLSA. This amendment is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by this AD are intended to prevent continuous aft transfer of fuel due to the FLSA not supplying electrical power to the trim tank overflow sensor, which could result in potential loss of fuel during flight.
AD 99-04-19 · published Feb 19, 1999, effective Mar 8, 1999
Boeing Model 777 Series Airplanes
This amendment adopts a new airworthiness directive (AD) that is applicable to all Boeing Model 777 series airplanes. This action requires repetitive detailed visual inspections to detect cracking of the cove skin on the outboard leading edge slats; a slat adjustment check; and corrective actions, if necessary. This amendment is prompted by reports of fatigue cracking and/or missing pieces of the cove skin on the outboard leading edge slats. The actions specified in this AD are intended to detect and correct such discrepancies, which could result in skin separation or structural damage to the leading edge slats, and consequent reduced controllability of the airplane.
AD 99-04-21 · published Feb 22, 1999, effective Apr 2, 1999
British Aerospace Jetstream Models 3101 and 3201 Airplanes
This amendment adopts a new airworthiness directive (AD) that applies all British Aerospace Jetstream Model 3101 airplanes that have a certain wheel assembly incorporated and all Jetstream Model 3201 airplanes that are equipped with Dunlop AH54450 brake units. This AD requires inspecting the main landing gear brake units for correct setting of the wear indicator pins, and re-setting the pins if incorrect. This AD is the result of mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for the United Kingdom. The actions specified by this AD are intended to prevent failure of the main landing gear brakes because the wear indicator pins present a false indication of the remaining wear of the brake units, which could result in loss of control of the airplane during takeoff, landing, or taxi operations.
AD 99-04-23 · published Feb 22, 1999, effective Mar 29, 1999
Boeing Model 737 Series Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 737 series airplanes, that requires repetitive ultrasonic inspections to detect broken bolts that attach the terminal support fittings to the upper part of the Body Station 1088 bulkhead, and corrective actions, if necessary. This amendment also requires eventual replacement of the existing bolts with new, improved bolts, which, when accomplished, terminates the repetitive inspection requirements of this AD. This amendment is prompted by reports that bolts that attach the terminal support fittings to the upper part of the bulkhead were found broken. The actions specified by this AD are intended to prevent such broken bolts, which could result in reduced structural integrity of the vertical fin installation and possible loss of the vertical fin.
AD 99-04-24 · published Feb 23, 1999, effective Mar 30, 1999
Aerospatiale Model ATR72 Series Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain Aerospatiale Model ATR72 series airplanes, that requires a one-time inspection to detect damage of certain anchor nuts located on the upper surface of the wings, and replacement of the anchor nuts with new or serviceable nuts, if necessary. This amendment is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by this AD are intended to prevent failure of anchor nuts on the upper surface of the wings, which could result in reduced structural integrity of the airplane.
AD 98-19-04 · published Feb 16, 1999, effective Mar 3, 1999
Agusta S.p.A. Model A109C, A109E, and A109K2 Helicopters
This document publishes in the Federal Register an amendment adopting Airworthiness Directive (AD) AD 98-19-04, which was sent previously to all known U.S. owners and operators of Agusta S.p.A. Model A109C, A109E, and A109K2 helicopters by individual letters. This AD requires conducting a tapping inspection of the upperside and lowerside of the main rotor blade (blade) blade tip cap for debonding between the metal shells and honeycomb core; conducting a visual inspection of the upperside and lowerside of the blade tip cap for swelling or deformation between the metal shells and the honeycomb core; and visually inspecting the welded bead along the leading edge of the blade tip cap for cracks. This amendment is prompted by two discoveries of cracks in the leading edge of the blade tip cap of a blade. The actions specified by this AD are intended to prevent blade blade tip cap failure and subsequent loss of control of the helicopter.
AD 99-01-09 · published Feb 16, 1999, effective Mar 3, 1999
Sikorsky Aircraft Corporation Model S- 76C Helicopters
This document publishes in the Federal Register an amendment adopting Airworthiness Directive (AD) 99-01-09 which was sent previously to all known U.S. owners and operators of Sikorsky Aircraft Corporation (Sikorsky) Model S-76C helicopters by individual letters. This AD requires, before further flight, installing a placard in the cockpit adjacent to the fuel quantity gauge that states ``No flight operations to be conducted with less than 250 lbs. fuel in each tank.'' This AD must be placed in the Operating Limitations section of the Rotorcraft Flight Manual. This AD also requires, within 50 hours time- in-service (TIS) or 30 calendar days, whichever occurs first, defueling, engine starting, and if necessary, inspecting fuel supply lines. This amendment is prompted by an in-flight engine flame-out that occurred on October 27, 1998. The actions specified by this AD are intended to prevent air from getting into a fuel supply line when there is less than 250 lbs. of fuel in either fuel tank, engine flame-out, and a subsequent forced landing.
AD 99-04-12 · published Feb 16, 1999
McDonnell Douglas Helicopter Systems Model 369D, 369E, 369FF, 369H, MD500N, and MD600N Helicopters
This amendment adopts a new airworthiness directive (AD), applicable to McDonnell Douglas Helicopter Systems (MDHS) Model 369D, 369E, 369FF, 369H, MD500N, and MD600N helicopters, that requires a one- time visual inspection of certain input shaft coupling assemblies for pitting. This amendment is prompted by three operators' reports of discovering pitting on the internal spline teeth. The actions specified by this AD are intended to prevent failure of the spline teeth in the input shaft coupling assembly, loss of drive to the main rotor system, and subsequent loss of control of the helicopter.
AD 99-04-14 · published Feb 16, 1999
Schweizer Aircraft Corporation Model 269C-1 Helicopters
This amendment adopts a new airworthiness directive (AD), applicable to Schweizer Aircraft Corporation Model 269C-1 helicopters, that requires a visual inspection of the bond line between the main rotor blade (blade) abrasion strip (abrasion strip) and the blade for voids, separation, or lifting of the abrasion strip; a visual inspection of the adhesive bead around the perimeter of the abrasion strip for erosion, cracks, or blisters; a tap (ring) test of the abrasion strip for debonding or hidden corrosion voids; and removal of any blade with an unairworthy abrasion strip and replacement with an airworthy blade. This amendment is prompted by four reports that indicate that debonding and corrosion have occurred on certain blades where the abrasion strip attaches to the blade skin. The actions specified by this AD are intended to prevent loss of the abrasion strip from the blade and subsequent loss of control of the helicopter.
AD 99-04-13 · published Feb 17, 1999, effective Mar 4, 1999
Bell Helicopter Textron, Inc. Model 214ST Helicopters
This amendment adopts a new airworthiness directive (AD) that is applicable to Bell Helicopter Textron, Inc. (BHTI) Model 214ST helicopters. This action requires a reduction of the never-exceed velocity (Vne) limitation until an inspection of the tail rotor yoke (yoke) assembly for fatigue damage and installation of a redesigned yoke flapping stop are accomplished. Recurring periodic and special inspections to detect occurrences of yoke overload are also required. This amendment is prompted by reports of inflight failures of yokes installed on civilian and military helicopters of similar type design. The actions specified in this AD are intended to prevent fatigue failure of the yoke that could result in loss of the tail rotor and subsequent loss of control of the helicopter.
AD 99-04-20 · published Feb 17, 1999, effective Mar 4, 1999
Agusta S.p.A. Model A109K2 Helicopters
This amendment adopts a new airworthiness directive (AD) that is applicable to Agusta S.p.A. Model A109K2 helicopters. This action requires replacing a certain Breeze-Eastern rescue hoist (rescue hoist) with a different part-numbered airworthy rescue hoist. This amendment is prompted by an incident in which a rescue hoist cable broke due to cable damage, resulting in one fatality. The actions specified in this AD are intended to prevent the breaking of the rescue hoist cable, personal injury, or entanglement of the rescue hoist cable in the helicopter's main or tail rotor blades, and subsequent loss of control of the helicopter.
AD 99-03-05 · published Feb 3, 1999, effective Feb 18, 1999
Textron Lycoming Model O-540-F1B5 Reciprocating Engines
This amendment adopts a new airworthiness directive (AD) that is applicable to Textron Lycoming Model O-540-F1B5 reciprocating engines. This action requires the removal and replacement of the crankshaft gear retaining bolts. This amendment is prompted by 2 reported failures of the crankshaft gear retaining bolts. The actions specified in this AD are intended to prevent failure of the crankshaft gear retaining bolts, which can result in engine failure and subsequent autorotation and forced landing.
AD 99-03-09 · published Feb 4, 1999, effective Feb 19, 1999
Allison Engine Company, Inc. AE 2100A, AE 2100C, and AE 2100D3 Series Turboprop Engines
This amendment adopts a new airworthiness directive (AD) that is applicable to Allison Engine Company, Inc. AE 2100A, AE 2100C, and AE 2100D3 series turboprop engines. This action requires removing from service affected turbine wheels prior to exceeding new, reduced cyclic life limits. This amendment is prompted by the results of a refined life analysis. The actions specified in this AD are intended to prevent an uncontained turbine wheel failure, which could result in damage to the aircraft.
AD 99-04-04 · published Feb 10, 1999, effective Feb 25, 1999
Textron Lycoming Reciprocating Engines IO-540 and O-540 Engines Equipped With Slick Aircraft Products Magnetos
This amendment adopts a new airworthiness directive (AD) that is applicable to Textron Lycoming IO-540 and O-540 engines equipped with Slick Aircraft Products magnetos. This action requires removal of the Slick magneto from the engine and inspection of the impulse coupling pawl for wear. This amendment is prompted by several service difficulty reports, two incidents, and an accident involving severely worn and failed impulse couplings. The actions specified in this AD are intended to prevent failure of the magneto impulse coupling, resulting in seizure of the engine.
AD 99-04-09 · published Feb 10, 1999, effective Feb 25, 1999
Rolls-Royce Limited Dart Series Turboprop Engines
This amendment adopts a new airworthiness directive (AD) that is applicable to Rolls-Royce Limited (R-R) Dart series turboprop engines. This action requires initial and repetitive fuel burner fuel flow calibration checks, and overhaul or replacement of fuel burners. This amendment is prompted by reports of an uncontained engine failure and fire due to HPT disk rupture caused by fuel burner failure. The actions specified in this AD are intended to prevent HPT disk rupture, which can result in an uncontained engine failure, engine fire, and damage to the aircraft.
AD 99-04-03 · published Feb 11, 1999, effective Apr 12, 1999
International Aero Engines AG (IAE) V2500-A5/-D5 Series Turbofan Engines
This amendment adopts a new airworthiness directive (AD), applicable to International Aero Engines AG (IAE) V2500-A5/-D5 series turbofan engines, that requires the removal from service of certain high pressure compressor (HPC) stage 9-12 drums prior to reaching the new reduced cyclic life limits, and replacement with serviceable parts. This amendment is prompted by the reduction of the life limit for certain IAE V2500 HPC stage 9-12 drums due to higher stresses in this part than originally predicted. The actions specified by this AD are intended to prevent high pressure compressor (HPC) stage 9-12 drum failure, which could result in an uncontained engine failure and damage to the aircraft.
AD 99-04-05 · published Feb 11, 1999, effective Apr 12, 1999
Pratt & Whitney JT9D Series Turbofan Engines
This amendment adopts a new airworthiness directive (AD), applicable to certain Pratt & Whitney (PW) JT9D series turbofan engines, that requires a fluorescent penetrant inspection (FPI) of the rear skirt of the diffuser case for cracks, and, if necessary, blending down to minimum wall thickness to remove cracks and subsequent FPI to determine if cracks have been removed, polishing, and shotpeening. If the cracks are shown by subsequent FPI not to have been removed, this AD requires removing the diffuser case from service and replace with a serviceable part. This amendment is prompted by a report of a diffuser case rupture during takeoff roll that resulted in damage to the aircraft. The actions specified by this AD are intended to prevent diffuser case rupture due to cracks, which can result in an uncontained engine failure and damage to the aircraft.
AD 98-24-03 · published Feb 24, 1999, effective Mar 11, 1999
BMW Rolls-Royce GmbH Models BR700- 710A1-10 and BR700-710A2-20 Turbofan Engines
This document publishes in the Federal Register an amendment adopting Airworthiness Directive (AD) 98-24-03 that was sent previously to all known U.S. owners and operators of BMW Rolls-Royce GmbH (BRR) Models BR700-710A1-10 and BR700-710A2-20 turbofan engines by individual letters. This AD requires repetitive visual inspections of the fairing and fasteners for correct installation and damage, and verification that the engine core fairing fasteners are torqued to the higher torque value. This amendment is prompted by a report of an engine compressor core fairing failure during engine ground runs. The actions specified by this AD are intended to prevent engine compressor or combustion core fairing detachment and damage to the engine bypass duct, resulting in engine failure and damage to the aircraft.
