Results
2013-15-03: We are adopting a new airworthiness directive (AD) for Eurocopter Model AS350B, AS350BA, AS350B1, AS350B2, AS350B3, AS350C, AS350D, and AS350D1 helicopters with a single hydraulic system and a certain hydraulic pump drive installed. This AD requires inspecting the hydraulic pump drive pulley bearing (pulley bearing) for leaks, rust, overheating, and condition. This AD is prompted by six reports of hydraulic pump drive belt failure caused by seizure of the pulley bearing. These actions are intended to prevent hydraulic pump drive belt failure, loss of hydraulic servo assistance, and subsequent loss of control of the helicopter.
2003-11-01: This amendment supersedes an existing airworthiness directive (AD), applicable to all Boeing Model 747 series airplanes, that currently requires periodic inspections and cleaning of the drainage system cavity of the canted pressure deck, aft of the wing center section. This amendment adds new repetitive tests and inspections for discrepancies of the drainage system of the canted pressure deck; and corrective actions, if necessary. This amendment also terminates the requirements of the existing AD. The actions specified by this AD are intended to prevent ice accumulation on the lateral flight control cables and/or components due to water entering the wheel well of the landing gear and freezing, which could restrict or jam control cable movement, resulting in loss of controllability of the airplane. This action is intended to address the identified unsafe condition.
2013-14-03: We are adopting a new airworthiness directive (AD) for all The Boeing Company Model 727 airplanes. This AD was prompted by reports of cracks on the elevator rear spar stiffener assembly. This AD requires repetitive detailed inspections for cracking of the elevator rear spar stiffener assembly, and corrective actions if necessary. We are issuing this AD to detect and correct cracking of the elevator rear spar stiffener assembly, which could adversely affect elevator structural stiffness, which could lead to elevator vibration and possible interference with the tab control rod. These conditions could result in flutter and consequent loss of control of the airplane.
2013-14-07: We are adopting a new airworthiness directive (AD) for certain Learjet Inc. Model 45 airplanes. This AD was prompted by a report that the fire barrier seal on the external baggage door does not seal the surrounding door structure due to incorrect positioning of the barrier. This AD requires modifying the fire seal on the baggage door, including doing inspections of the fire seal for correct contact and corrective action if necessary. We are issuing this AD to prevent improper sealing of the baggage door, which could increase the risk of an uncontained fire in the baggage compartment.
75-16-06: 75-16-06 SOCIETE NATIONALE INDUSTRIELLE AEROSPATIALE: (S.N.I.A.S. formerly SUD AVIATION). Amendment 39-2279. Applies to Alouette Helicopters SE3130, SE313B, SA315B, SE3160, SA316B, SA3180, SA318B, SA318C, and SA319B equipped with tail rotor gearbox, P/Ns 3130S.66.20.000, 3130S.66.30.000, 3130S.66.40.000, 3130S.66.50.000, 3130S.66.60.000, or 3130S.66.70.000 without modification AM 1004, or P/Ns 3160S.66.00.000 or 3160.66.10.000 without modification AM 1582. Compliance is required within the next 10 hours' time in service after the effective date of this AD, unless already accomplished in accordance with Lama Service Bulletin No. 01.03 for Model SA315B or Alouette Service Bulletin No. 01.29 for the other designated models. To prevent possible jamming of the tail rotor directional control, accomplish the following: (a) Determine the width of the top of the square thread at each end of screws P/N 3130S.66.23.002 or 3130S.66.50.016. If the width is between 1.5 and 2.0 mm, the assembly may be reinstalled without further work. NOTE: Access to the screws is gained by removing the tail rotor pitch change control shaft. (b) If the thread width is not within 1.5 and 2.0mm, rework the extreme end of the thread and reinstall the tail rotor pitch change assembly in accordance with Aerospatiale Service Bulletin No. 01.29 dated November 10, 1971 (except Aerospatiale Service Bulletin No. 01.03 dated November 10, 1971 for Model SA315B), or an equivalent approved by the Chief, Aircraft Certification Staff, FAA, Europe, Africa, and Middle East Region, c/o American Embassy, APO New York, NY 09667. This amendment becomes effective July 28, 1975.
2000-11-05: This amendment adopts a new airworthiness directive (AD) that applies to certain Air Tractor Incorporated (Air Tractor) Models AT-301, AT-401, and AT-501 airplanes that are equipped with a 3/16-inch thick aluminum fin front spar fitting and an all metal rudder. This AD requires that you repetitively inspect the vertical fin front spar attachment fittings for fatigue cracks, and rework the vertical fin if any cracks are found. This AD is the result of reports of a vertical fin front spar fitting failure on a Model AT-401 airplane. The actions specified by this AD are intended to detect and correct cracks in the vertical fin front spar attachment fittings, which could result in failure of the vertical fin. This condition could lead to loss of directional control and eventual loss of airplane control.
98-16-08: This amendment supersedes an existing airworthiness directive (AD), applicable to certain Airbus Model A300-600 and A310 series airplanes, that currently requires revising the Airplane Flight Manual (AFM) to instruct the flightcrew to cross-check certain primary power setting parameters of the Thrust Control Computer (TCC) against tables of these values; and apply corrective action, if necessary. That AD also provides for optional terminating action for the AFM revisions. This amendment requires accomplishment of the previously optional terminating action. 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 incorrect primary power setting parameters of the TCC, which could result in insufficient thrust being applied during takeoff.
2013-13-17: We are superseding airworthiness directive (AD) 2011-13-08 for certain Bombardier, Inc. Model DHC-8-400 series airplanes. AD 2011-13- 08 required a free-play check for excessive free-play of the shaft swaged bearing installed in the tailstock end of each elevator power control unit (PCU), and replacing any PCU on which the bearing exceeds allowable limits with a serviceable PCU. This new AD adds airplanes to the applicability from that of AD 2011-13-08. This AD was prompted by a determination that additional airplanes are affected by the identified unsafe condition. We are issuing this AD to detect and correct excessive free-play of the swaged bearings, which could lead to excessive airframe vibrations and difficulties in pitch control, and consequent loss of controllability of the airplane.
2012-12-15: We are superseding an existing airworthiness directive (AD) for The Boeing Company Model 757 Airplanes. That AD currently requires revising the Airworthiness Limitations (AWLs) section of the Instructions for Continued Airworthiness by \n\n((Page 42965)) \n\nincorporating new limitations for fuel tank systems to satisfy Special Federal Aviation Regulation No. 88 requirements. That AD also requires the initial inspection of certain repetitive AWL inspections to phase- in those inspections, and repair if necessary. This new AD requires actions that were provided previously as optional actions, and would require a certain initial inspection to be accomplished for a revised AWL. This AD was prompted by a report that an AWL required by the existing AD must be revised. We are issuing this AD to prevent the potential for ignition sources inside fuel tanks caused by latent failures, alterations, repairs, or maintenance actions, which, in combination with flammable fuel vapors, could result in a fuel tank explosion and consequent loss of the airplane.
2003-11-03: This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 727, 737-100, 737-200, and 737-200C series airplanes, that requires one-time inspections to determine the part numbers of hydraulic accumulators installed in various areas of the airplane, and follow-on corrective actions if necessary. The actions specified by this AD are intended to prevent high-velocity separation of a barrel, piston, or end cap from a hydraulic accumulator. Such separation could result in injury to personnel in the accumulator area; loss of cabin pressurization; loss of affected hydraulic systems; or damage to plumbing, electrical installations, or structural members. This action is intended to address the identified unsafe condition.
2013-10-51: We are publishing a new airworthiness directive (AD) for Eurocopter France Model AS350B, AS350BA, AS350B1, AS350B2, AS350B3, AS350C, AS350D, AS350D1, AS355E, AS355F, AS355F1, AS355F2, AS355N, and AS355NP helicopters. This AD requires, before further flight, determining whether a single hydraulic main or tail rotor servo-control is installed on your helicopter. If a certain servo-control is installed, before the further flight, this AD requires replacing that servo-control. This AD was prompted by the discovery of excessive axial play detected on bearings installed on certain single hydraulic main and tail rotor servo-controls (servo-control). The excessive play could cause the distributor slide valve to jam in its sleeve. This condition could result in jamming the hydraulic flight controls, necessitating that the pilot cut off hydraulic power. This action would increase the pilot's workload, resulting in possible loss of helicopter control.
2003-11-06: This amendment adopts a new airworthiness directive (AD), applicable to all BAE Systems (Operations) Limited Model ATP airplanes, that requires a one-time inspection of the fuel pipes within the fuel "float switch" test pipelines in the left and right inner wings for evidence of damage, cracks, misalignment, or fuel leakage; follow-on corrective actions, if necessary; and repetitive replacement of the fuel pipes at regular intervals. This action is necessary to prevent fuel vapors from collecting in the dry bay of the wing torsion box and consequent risk of an explosion due to fuel leakage. This action is intended to address the identified unsafe condition.
2000-10-19: This amendment adopts a new airworthiness directive (AD), applicable to certain Israel Aircraft Industries, Ltd., Model 1125 Westwind Astra and Astra SPX series airplanes, that requires replacement of the existing pneumatic de- icing boot pressure indicator switch with a newly designed switch. This amendment is prompted by an occurrence on a similar airplane model in which the pneumatic de-icing boot indication light may have provided the flightcrew with misleading information as to the proper functioning of the de-icing boots. The actions specified by this AD are intended to prevent ice accumulation on the airplane leading edges, which could result in reduced controllability of the airplane.
2000-10-17: This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 747 series airplanes, that requires inspections, tests, and certain modifications of the thrust reverser control and indication system and wiring on each engine, and corrective action, if necessary. This amendment also requires installation of a terminating modification, and repetitive functional tests of that installation to detect discrepancies, and repair, if necessary. This amendment is prompted by the results of a safety review, which revealed that in-flight deployment of a thrust reverser could result in significant reduction in airplane controllability. The actions specified by this AD are intended to ensure the integrity of the fail-safe features of the thrust reverser system by preventing possible failure modes, which could result in inadvertent deployment of a thrust reverser during flight, and consequent reduced controllability of the airplane.
2013-13-08: We are superseding an existing airworthiness directive (AD) for certain The Boeing Company Model 767 airplanes. That AD currently requires sealing certain fasteners and stiffeners in the fuel tank, changing certain wire bundle clamp configurations on the fuel tank walls, inspecting certain fasteners in the fuel tanks and determining the method of attachment of the vortex generators; and performing corrective actions if necessary. This new AD adds a general visual inspection for the presence of a polytetrafluoroethylene \n\n((Page 42412)) \n\n(TFE) sleeve at the clamp location on the rear spar, and installation of a TFE sleeve if necessary. This new AD also adds airplanes to the applicability. This AD was prompted by fuel system reviews conducted by the manufacturer, and the identification of another possible ignition source location. We are issuing this AD to prevent possible ignition sources in the auxiliary (center) fuel tank, main fuel tanks, and surge tanks caused by a wiring short or lightning strike, which could result in fuel tank explosions and consequent loss of the airplane.
71-20-02: 71-20-02 HAWKER SIDDELEY: Amdt. 39-1295. Applies to Model DH-114 "Heron" airplanes. Compliance is required as indicated. To ensure that the emergency escape hatches (P/N's 14 FS.2991A, 4 FS.835A/1, or 4 FS.835A/2) can be opened from outside the airplane accomplish the following: (a) Before further flight check the operation of each escape hatch lock mechanism by turning the external handle with the internal handle in the stowed position. The check required by this paragraph may be performed by the pilot. (b) If an escape hatch lock mechanism is found to be inoperable during the check required by paragraph (a), before further flight, except that the airplane may be flown in accordance with FAR 21.197 to a base where the repairs can be performed, secure the inoperable lock mechanism to the escape hatch in accordance with Hawker Siddeley Aviation, Ltd., Technical News Sheet Series: Heron (114) No. F.16, Issue 1, dated March 15, 1971, or an FAA- approved equivalent.(c) Within the next 100 hours' time in service after the effective date of this AD, unless already accomplished, secure the lock mechanism to each escape hatch in accordance with Hawker Siddeley Aviation, Ltd., Technical news Sheet Series: Heron (114) No. F.16, Issue 1, dated March 15, 1971, or an FAA-approved equivalent. This amendment becomes effective September 23, 1971.
2012-23-13: We are adopting a new airworthiness directive (AD) for Sikorsky Model S-70, S-70A, and S-70C helicopters, which are restricted category helicopters derived from the military Model UH-60 helicopter. This AD would require reducing or establishing life limits for certain listed helicopter parts. This AD is prompted by a review of the United States Army's analysis of their Model UH-60 fleet, which determined it necessary to establish or reduce the life limits of certain parts. The actions are intended to prevent fatigue failure of a part and subsequent loss of control of the helicopter.
85-16-09: 85-16-09 PILATUS AIRCRAFT, LTD., AND FAIRCHILD-HILLER: Amendment 39-5107. Applies to Model(s) PC-6 (S/N 1 to and including 844, and S/N 2001 to and including 2092) airplanes certificated in any category. NOTE: Service Bulletin (S/N) Numbers (no.) 142, 143, and 144 all dated December 1984, are applicable to Pilatus Aircraft Ltd., built airplanes which are identified by Serial Numbers (S/N) below 1000, and Service Letters (S/L) PC6-55-2, PC6-55-3 and PC6-55-4 all dated April 9, 1985, are applicable to Fairchild-Hiller built airplanes which are identified by S/N's above 2000. Compliance: Required as indicated after the effective date of this AD, unless already accomplished. To prevent a possible loss of airplane control, accomplish the following: (a) Within the next 25 hours time-in-service (TIS) after the effective date of this AD: (1) On airplanes S/N 1 to and including 826 and 2001 to and including 2092 (except 524, 676, 707, 710 and 816), perform the required inspection and corrective action if needed in accordance with paragraphs (b), (c) and (d) of this AD, and (2) On airplanes S/N 827 to and including 844 perform the required inspection and corrective action if needed in accordance with paragraph (d) of this AD. (b) Using a dye penetrant test method, inspect the Left Hand and Right Hand cap angles adjacent to the rudder hinge attachment points on the vertical stabilizer for cracks, in accordance with S/B No. 142 Section 2, "ACCOMPLISHMENT INSTRUCTIONS", PARAGRAPH (para.) A "INSPECTION" or S/L PC6-55-2. If cracks are found, prior to further flight replace the defective cap angle and modify the vertical stabilizer in accordance with S/B No. 142, Section 2, "ACCOMPLISHMENT INSTRUCTIONS" para. B "MODIFICATION", or S/L PC6-55-2. (c) Using a dye penetrant test method inspect the upper and lower cap angles adjacent to the elevator bearing bracket attachment points on the horizontal stabilizer in accordance with S/B No. 143, Section 2 "ACCOMPLISHMENT INSTRUCTIONS", para. A "INSPECTION", or S/L PC6-55-3. (1) If cracks are found, prior to further flight, repair in accordance with the repair scheme of S/B No. 143 or S/L PC6-55-3, and in addition; (2) If the bolt hole is less than 0.120 inches (in.) (3mm) from the edge of the cap angle, modify the horizontal stabilizer prior to further flight in accordance with S/B No. 143, Section 2 "ACCOMPLISHMENT INSTRUCTIONS", para. B "MODIFICATION" or S/L PC6-55-3. (d) Visually inspect the area around the rectangular cutout located in the front spar of the horizontal stabilizer, adjacent to the elevator control cables pulley assembly, in accordance with S/B No. 144, Section 2 "ACCOMPLISHMENT OF INSTRUCTIONS", para. B "CRACK INSPECTION", or S/L PC6-55-4. If cracks are found and; (1) If no crack is longer than 0.20 inches (5mm) install within the next 50 hours TIS standard repair plate (P/N 113.45.06.027) in accordance with S/B No. 144, Section 2 "ACCOMPLISHMENT INSTRUCTIONS", para. D "INSTALLATION OF STANDARD REPAIR PLATE" or S/L PC6-55-4. (2) If any crack is longer than 0.20 inches (5mm) but less than 0.80 inches (20mm), prior to further flight install standard repair plate (P/N 113.45.06.027) in accordance with para. (d)(1) of this AD. (3) If any crack is longer than 0.80 inches (20mm), prior to further flight repair the horizontal stabilizer in accordance with S/B No. 144, Section 2 "ACCOMPLISHMENT INSTRUCTIONS", para. C "SPECIAL PROCEDURES" or S/L PC6-55-4. (e) Each 100 hours TIS after the initial inspection: (1) On airplanes S/N 1 to and including 826 and 2001 to and including 2092 (except 524, 676, 707, 710 and 816) repeat the inspection required by para. (b) of this AD, until the modification described in S/B No. 142, para. 2.B "MODIFICATION" or S/L PC6-55-2 is complied with, at which time this repetitive inspection is no longer required. (2) On airplanes S/N 1 to and including 844 and S/N 2001 to and including 2092, repeat the inspection required by para. (d) of this AD. (f) The intervals between the repetitive 100 hour TIS inspections required by para. (e) of this AD may be adjusted up to 10 percent of the specified interval to allow accomplishment of these inspections concurrent with other scheduled maintenance of the airplane. (g) Aircraft may be flown in accordance with Federal Aviation Regulation 21.197 to a location where this AD can be accomplished. (h) An equivalent method of compliance with this AD, if used, must be approved by the Manager, Aircraft Certification Staff, AEU-100, Europe, Africa, and Middle East Office, FAA, c/o American Embassy, 1000 Brussels, Belgium. All persons affected by this directive may obtain copies of the documents referred to herein upon request to Pilatus Aircraft, Ltd., CH6370-Stans, Switzerland, or Fairchild-Republic Corp., Showalter Road, Hagerstown, Maryland 21740, or FAA, Office of the Regional Counsel, Room 1558, 601 East 12th Street, Kansas City, Missouri64106. This amendment becomes effective on August 31, 1985.
85-19-01: 85-19-01 BOEING: Amendment 39-5134. Applies to Boeing Model 767 and 757 series airplanes, and certain Model 737 and 727 series airplanes, certificated in any category, equipped with Rosemount Angle of Attack (AOA) sensors identified as Model 861CAB or 861CAK and modification number 0001. To prevent the hazards associated with a malfunctioning AOA sensor caused by loose resolver and/or damper gears, accomplish the following as indicated below, unless already accomplished: \n\n\tA.\tInspect Model 757 and 767 series airplanes equipped with Rosemount AOA sensors, Model 861CAB, modification number 0001, within 300 flight hours or 30 days, whichever is later, after the effective date of this AD, and thereafter at intervals not to exceed 300 flight hours or 30 days, whichever is later, until the replacement prescribed in subparagraph A.1. or A.2., below, is accomplished: \n\n\t\t1.\tReplace Rosemount AOA sensors, serial numbers 00475 through 00629, within 180 days after the effective date ofthis AD, with a unit bearing modification number 0001A, in accordance with the instructions in paragraph C., below. \n\n\t\t2.\tReplace Rosemount AOA sensors, serial numbers 00001 through 00474, within 360 days after the effective date of this AD, with a unit bearing modification number 0001A, in accordance with the instructions in paragraph C., below. \n\n\tInspect in accordance with the appropriate Boeing Alert Service Bulletin, 757-34A0026 or 767-34A30, both dated November 12, 1984, or later FAA approved revision. Units determined to be faulty during inspections must be replaced with a serviceable unit, prior to further flight. \n\n\tB.\tInspect Model 727 and 737 series airplanes equipped with Rosemount AOA sensors, Model 861CAK, modification number 0001, within 300 flight hours or 30 days, whichever is later, after the effective date of this AD, and thereafter at intervals not to exceed 300 flight hours or 30 days, whichever is later, until the replacement required in subparagraph B.1., below, is accomplished: \n\n\t\t1.\tReplace Rosemount AOA sensors, serial numbers 00001 through 00173, within 180 days after the effective date of this AD, with a unit bearing modification number 0001A in accordance with the instructions in paragraph C., below. \n\n\tInspect in accordance with paragraph 3 of "Accomplishment Instructions" of the appropriate Boeing Alert Service Bulletin, 727-34A0223 or 737-27A1126, both dated November 12, 1984, or later FAA approved revision. Units determined faulty during inspections must be replaced with a serviceable unit, before further flight. \n\n\tC.\tRemove, inspect, and rework Rosemount AOA sensors as specified in paragraphs A. and B., above, in accordance with the appropriate Rosemount Service Bulletin, 861CAB-34-02 or 861CAK-34-01, both dated November 12, 1984, or later FAA approved revision. Units found with both resolver gears loose must be returned to Rosemount for rework. \n\n\tD.\tAlternate means of compliance which provide an acceptable level of safety may be used when approved by the Manager, Seattle Aircraft Certification Office, FAA, Northwest Mountain Region. \n\n\tE.\tSpecial flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base for the accomplishment of replacements required by this AD. \n\n\tAll persons affected by this directive who have not already received the above specified service bulletins from the manufacturers may obtain copies upon request to the Boeing Commercial Airplane Company, P.O. Box 3707, Seattle, Washington 98124, or Rosemount, Inc., P.O. Box 35129, Minneapolis, Minnesota 55435. They may also be examined at the FAA, Seattle Aircraft Certification Office, 9010 East Marginal Way South, Seattle, Washington. \n\n\tThis amendment becomes effective October 12, 1985.
2018-06-09: We are adopting a new airworthiness directive (AD) for Pacific Aerospace Limited Model 750XL airplanes. This AD results from mandatory continuing airworthiness information (MCAI) issued by the aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as the possibility for the control column to snag on the cockpit control tee handles on certain airplanes. We are issuing this AD to require actions to address the unsafe condition on these products.
73-06-01: 73-06-01\tBOEING: Amdt. 39-1603. Applies to all Model 727 series airplanes listed in Boeing Service Bulletin 27-129 dated 3 October 1969, or later FAA approved Revisions. \n\tCompliance required as indicated. \n\tTo prevent failures of the leading edge slat actuators, accomplish the following: \n\t(a)\tWithin 3000 landings from the effective date of this AD. \n\t\t(1)\tRework actuators (Ronson Part No. 1U1095) on leading edge slats numbered 1, 2, 7 and 8 in accordance with rework instructions in Boeing Service Bulletin 27-129, dated 3 October 1969, or later FAA approved Revisions, or rework in a manner approved by the Chief, Engineering and Manufacturing Branch, FAA Northwest Region, or \n\t\t(2)\tReplace actuators (Ronson Part No. 1U1095) on slats numbered 1, 2, 7 and 8 with redesigned actuators, Ronson Part Nos. 1U1095-5 or 1U1095-9-2, or replace with actuators, Decoto Part Nos. 2-690029-1, -2, or -3. \n\t(b)\tRework of the actuators, Ronson Part No. 1U1095 in accordance with (a)(1) above orreplacement of the actuators in accordance with (a)(2) above constitutes terminating action under the provisions of this AD. \n\n\tThis amendment becomes effective March 13, 1973.
2000-10-01: This amendment supersedes an existing airworthiness directive (AD), applicable to all Airbus Model A300 B2, A300 B2K, A300 B2-200, A300 B4, A300 B4-100, and A300 B4-200 series airplanes, that currently requires certain structural inspections and modifications. This amendment requires that those inspections be accomplished on additional airplanes. This action also requires new repetitive inspections for airplanes in certain configurations at revised thresholds and intervals. 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 detect and correct corrosion and cracking of the wings and fuselage, which could result in reduced structural integrity of the airplane.
2003-11-07: This amendment adopts a new airworthiness directive (AD), applicable to all Israel Aircraft Industries, Ltd. Model 1121, 1121A, 1121B, 1123, 1124, and 1124A series airplanes, that requires removing the existing oxygen shutoff valve and installing a new oxygen shutoff valve. This action is necessary to prevent rapid adiabatic compression within the oxygen line between the oxygen shutoff valve and the pressure regulator due to a shutoff valve that can be opened quickly, which could result in overheating of the oxygen system, and consequent fire in the cockpit. This action is intended to address the identified unsafe condition.
2022-04-01: The FAA is adopting a new airworthiness directive (AD) for DG Flugzeugbau GmbH Model DG-1000T gliders and Schempp-Hirth Flugzeugbau GmbH Model Duo Discus T gliders with a Solo Kleinmotoren GmbH Solo Model 2350C or 2350D engine installed. This AD was prompted by mandatory continuing airworthiness information (MCAI) issued by the aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as failure of the bearing of the upper pulley of the belt driven reduction gear resulting in separation of the propeller from the engine. This AD requires replacing a certain hex-nut and establishing a life limit for the ball bearing assembly. The FAA is issuing this AD to address the unsafe condition on these products.
2013-13-04: We are adopting a new airworthiness directive (AD) for certain [[Page 41287]] Airbus Model A318, A319, A320, and A321 series airplanes. This AD was prompted by a report of an uncommanded nose landing gear (NLG) retraction. This AD requires installing a power interruption protection circuit for the landing gear control interface unit (LGCIU). We are issuing this AD to prevent untimely unlocking and/or retraction of the NLG, which, while on the ground, could result in injury to ground personnel and damage to the airplane.