COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Boeing 737 Series Aeroplanes
AD/B737/97 Fwd Galley Service Door Lower Gate Hinge 9/96
Applicability: Model 737 series aircraft, as listed in Boeing Service Bulletin 737-52A1124; on which the actions specified in Boeing Service Bulletin 737-52-1097, Revision 1, or Revision 2, have not been accomplished.
Requirement: Perform a detailed visual inspection to detect cracks of the lower gate hinge of the forward galley service door, in accordance with Boeing Alert Service Bulletin 737- 52A1124.
Note 1: Replacement of the lower gate hinge of the lower galley service door with an improved hinge, in accordance with Boeing Alert Service Bulletin 737-52A1124, constitutes terminating action for the requirements of this Directive.
Note 2: FAA AD 96-10-06 Amdt 39-9611 refers.
Compliance: Within 400 flight cycles after 15 August 1996, and thereafter at intervals not to exceed 4500 flight cycles; until replacement with an improved hinge.
Background: The FAA received reports of fatigue cracks in the lower gate hinge on the forward galley service door. If the hinge fails, the hinge and its associated parts and the emergency escape slide could separate from the aircraft and be ingested into the engine, or could strike and damage the flight control surfaces.
Overview
The Civil Aviation Regulations 1998, as amended, were enacted to ensure the safety and efficiency of civil aviation within Australia. Part 39, specifically addressing airworthiness directives, is designed to mitigate safety risks and maintain aircraft integrity. One such directive is AD/B737/97, issued in 1996, which targets Boeing 737 series aircraft and mandates detailed inspections of the lower gate hinge of the forward galley service door to prevent fatigue cracks. The directive was introduced in response to reports of potential hinge failures that could lead to severe consequences, including engine ingestion or damage to flight control surfaces. The objective of this directive is to ensure ongoing airworthiness by requiring compliance within specific flight cycle intervals and upon hinge replacement.
Scope and Application
The Civil Aviation Regulations 1998, specifically Part 39 - 105 under the Civil Aviation Safety Authority, apply to Boeing 737 series aircraft that have not yet implemented the actions specified in Boeing Service Bulletin 737-52-1097, Revision 1 or Revision 2. This regulation mandates a detailed visual inspection to detect cracks in the lower gate hinge of the forward galley service door as outlined in Boeing Alert Service Bulletin 737-52A1124. This inspection must be conducted within 400 flight cycles following 15 August 1996, and subsequently at intervals not exceeding 4500 flight cycles, until the lower gate hinge is replaced with an improved hinge. The regulation's purpose is to ensure the safety of the aircraft by preventing potential failure of the lower gate hinge, which could lead to serious damage if ingested into the engine or if it strikes flight control surfaces. Compliance with this directive is critical for maintaining airworthiness standards under the Civil Aviation Safety Authority.
Key Provisions
The Civil Aviation Regulations 1998, specifically in Part 39 - 105, include an Airworthiness Directive (AD) for Boeing 737 Series Aeroplanes, particularly concerning the forward galley service door lower gate hinge. AD/B737/97, issued on 9/96, applies to Model 737 series aircraft listed in Boeing Service Bulletin 737-52A1124, which have not yet implemented the actions specified in Boeing Service Bulletin 737-52-1097, Revision 1, or Revision 2. The directive requires operators to perform a detailed visual inspection of the lower gate hinge of the forward galley service door to detect any cracks, in accordance with Boeing Alert Service Bulletin 737-52A1124. Compliance with this directive is mandatory, and replacing the lower gate hinge with an improved one, as per the same Boeing Alert Service Bulletin, is considered a terminating action for the directive's requirements.
Operators of the specified Boeing 737 series aircraft must adhere to strict compliance timelines and intervals. The initial inspection must be performed within 400 flight cycles following 15 August 1996. Thereafter, inspections must be conducted at intervals not exceeding 4500 flight cycles, or until the lower gate hinge is replaced with an improved one. These stringent requirements are in place to ensure the continued airworthiness and safety of the aircraft. The directive is a direct response to reports of fatigue cracks in the lower gate hinge, which, if left unaddressed, could result in the hinge and associated parts, including the emergency escape slide, separating from the aircraft and being ingested into the engine, or striking and damaging the flight control surfaces.
Failure to comply with the requirements set forth in the AD/B737/97 directive could lead to serious safety risks. The AD mandates specific actions to prevent potential hazards, and any non-compliance could result in severe consequences. The Civil Aviation Safety Authority (CASA) enforces these regulations rigorously, and any breach may lead to penalties. While the specific penalties are not detailed in the directive, non-compliance with airworthiness directives generally can lead to enforcement actions, including fines, suspension of airworthiness certificates, and potential criminal charges. Operators must therefore ensure that all inspections and necessary actions are completed in a timely manner to avoid these adverse outcomes.