Results
2011-12-04: We are adopting a new airworthiness directive (AD) for the products listed above. This AD results from mandatory continuing airworthiness information (MCAI) issued by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as: During a production process review, a deviation in hardening of certain Part Number (P/N) 944072 washers has been detected, which exceeds the hardness of the design specification. The affected washers are part of the magneto ring flywheel hub installation and have been installed on a limited number of engines. No defective washers have been shipped as spare parts. This condition, if not corrected, could lead to cracks in the washer, loosening of the magneto flywheel hub and consequent ignition failure, possibly resulting in damage to the engine, in- flight engine shutdown and forced landing, damage to the aeroplane and injury to occupants. [[Page 33985]] We are issuing this AD to prevent engine in-flight shutdown, and damage to the airplane.
99-04-13: 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.
2009-18-19 R1: This amendment rescinds airworthiness directive (AD) 2009-18- 19 for the products listed above. This AD results from mandatory continuing airworthiness information (MCAI) issued by EASA, to rescind EASA AD 2010-0083. The MCAI specifies the following: \n\n\n\tIt has been assessed that multiple NRV (non-return valve) failures in combination with certain trapped fuel cases could potentially increase the quantity of unusable fuel on the aeroplane, possibly leading to fuel starvation which could result in engines in-flight shut down and would constitute an unsafe condition. To prevent and detect this condition, EASA issued EASA AD 2010-0083. \n\tBased on in service experience, mainly on the results of the operational test required by \n\n((Page 33987)) \n\nEASA AD 2010-0083, Airbus has performed a safety analysis on the NRV to check if the safety objectives are met. \n\tThis analysis of the Collector Cell motive flow line NRV, taking into account all failure scenarios, concludes thatthe previous non compliance can be alleviated. Consequently, no unsafe condition exists any more on the affected NRV. \n\tFor the reasons described above, EASA AD 2010-0083 is cancelled. \n\n\n\tThis AD rescinds the parallel FAA AD 2009-18-19.
2003-01-03: This amendment adopts a new airworthiness directive (AD) that is applicable to Hartzell Propeller Inc. model ( )HC-( )2Y( )-( ) propellers, with certain serial numbers (SN's) of two-bladed aluminum propeller hubs part numbers (P/N's) D-6522-1, D-6522-2, D-6529-1, and D-6559-3 installed. This action requires removal from service of those certain SN's of two-bladed aluminum propeller hubs and replacement with serviceable hubs. This amendment is prompted by a two-bladed aluminum propeller hub manufacturing quality control problem. The actions specified in this AD are intended to prevent in-flight propeller blade separation resulting in airframe and engine damage, and possible loss of the airplane.
62-24-05: 62-24-05 MARECO SAFETY BELTS: Amdt. 503 Part 507 Federal Register November 3, 1962. Applies to All Aircraft Equipped With Mareco Model 15-1 Safety Belts Which Are Identified on the Manufacturer's Identification Label on the Safety Belt as Being Manufactured in the Third and Fourth Quarters of 1959 and the First and Second Quarters of 1960. Compliance required within the next 100 hours' time in service after the effective date of this AD. Service difficulties with the Mareco Model 15-1 safety belt assemblies have occurred wherein the buckle locking cam became disengaged when tension on the belt assembly was relieved and would not reengage upon application of tension to the belt assembly due to the cam spring slipping from its retention slot. Therefore, the following is required: Replace Mareco Model 15-1 safety belts manufactured in the third and fourth quarters of 1959 and the first and second quarters of 1960, or modify with an FAA approved modification to preventthe slipping of the cam spring from its retaining end slot and to correct the misalignment between the cam and buckle frame. When an FAA approved modification is made after the effective date of this AD, the buckle frame or cam lever shall be permanently marked "MOD." followed by the date of modification. NOTE: Belts which were modified prior to the effective date of this AD in accordance with an FAA approved modification and identified with an embossed "X" are acceptable. This directive effective December 4, 1962.
97-02-19: This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 757 and 767 series airplanes, that requires replacement of the thrust management computer (TMC) with a new TMC. This amendment is prompted by reports indicating that an uncommanded advancement of the throttle levers occurred; this condition was apparently due to a high impedance connection to the excitation phase of the servo motor. The actions specified by this AD are intended to prevent an uncommanded runaway of the autothrottle during flight or ground operations as a result of problems associated with the TMC, which could distract the crew from normal operation of the airplane or lead to an unintended speed or altitude change.
2011-11-04: This amendment adopts a new airworthiness directive (AD) for the specified fire extinguishers. This action requires replacing each unairworthy portable fire extinguisher with an airworthy portable fire extinguisher. This amendment is prompted by an ongoing investigation that has established that unapproved Halon 1211 has been used to fill L'Hotellier portable fire extinguishers that are likely to be onboard various model helicopters. The actions specified in this AD are intended to prevent using contaminated gas that may reduce fire suppression and release toxic fumes that would endanger the safety of the helicopter and its occupants.
97-24-11: This amendment adopts a new airworthiness directive (AD), applicable to certain Fokker Model F28 Mark 0100 series airplanes, that requires repetitive inspections of certain flanges and finger strips at rib 5.0 of the vertical stabilizer to detect fatigue cracking, and repairs, if necessary. This amendment also requires modifications that would strengthen the torsion box at rib 5.0 and prevent fatigue cracking; one of these modifications constitutes terminating action for the repetitive inspections. This amendment is prompted by reports indicating that, during full-scale fatigue testing, cracking has been found on the vertical stabilizer of the test article. The actions specified by this AD are intended to detect and prevent fatigue cracking in the subject area, which, if not corrected, could reduce the structural integrity of the vertical stabilizer.
97-02-14: This amendment supersedes an existing airworthiness directive (AD), applicable to Robinson Helicopter Company (Robinson) Model R22 helicopters, that currently requires installation of an improved throttle governor; an adjustment to the low RPM warning unit threshold to increase the revolutions-per-minute (RPM) at which the warning horn and caution light activate; and revisions to the R22 Rotorcraft Flight Manual that prohibit flight with the improved throttle governor selected off, except in certain situations. This amendment requires the same actions required by the existing AD, as well as requires an insertion of procedures for the improved throttle governor into the Normal and Emergency sections of the R22 Rotorcraft Flight Manual and corrects the applicability section of the existing AD. This amendment is prompted by the need to insert normal and emergency procedures for the improved throttle governor into the flight manual, and expand the applicability statement of this AD to include all Robinson Model R22 helicopters. The actions specified by the proposed AD are intended to minimize the possibility of pilot mismanagement of the main rotor (M/R) RPM, which could result in unrecoverable M/R blade stall and subsequent loss of control of the helicopter.
2011-11-07: We are adopting a new airworthiness directive (AD) for the products listed above. This AD results from mandatory continuing airworthiness information (MCAI) issued by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as: Cracks have been reportedly found on DA 42 Main Landing Gear (MLG) Damper-to-Trailing Arm joints during standard maintenance. Depending on environmental-, operating- and runway conditions, the affected MLG joint, Part Number (P/N) D60-3217-23-5x (4 different lengths are available), which is made of aluminum, is susceptible to cracking. This condition, if not detected and corrected, may lead to failure of the joint and subsequent damage or malfunction of the MLG, possibly resulting in damage to the aeroplane during landing and injury to occupants. We are issuing this AD to require actions to correct the unsafe condition on these products.