AD/B737/93 - Galley Feeder Wiring

Overview

The Civil Aviation Regulations 1998 were enacted to provide for the regulation of civil aviation in Australia and to ensure the safety of aviation operations. The specific legislative instrument F2006B02994, issued under this Act, targets a recognised safety issue with the Boeing 737 Series aeroplanes equipped with certain Sabena Technics galleys. This safety directive, issued by the Civil Aviation Safety Authority, aims to address the potential risk of chafing in the galley feeder wire bundles, which could lead to electrical short circuits, smoke, and sparks, as evidenced by an incident reported by an operator of the Boeing 737-300 model. The policy objective of this directive is to mandate regular inspection and necessary modifications to the wiring bundles to mitigate these risks and ensure the continued airworthiness of the affected aircraft.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105 concerning Civil Aviation Safety Authority (CASA) Schedule of Airworthiness Directives, applies to the Boeing 737 series aeroplanes, namely the 737-200, -300, -400, and -500 models that are equipped with specific Sabena Technics galleys. These directives are critical for ensuring the safety and compliance of aircraft operations within Australia and internationally, given CASA's jurisdiction. The directive mandates inspections and modifications to the galley feeder wiring bundles to prevent chafing and potential short-circuiting, which can lead to smoke and sparks within the aircraft. Compliance with the directive is mandatory for operators within a specific timeframe post the directive's issuance on 14 September 1995. The directive applies universally to all specified aircraft models and does not exempt any particular entity or transaction from its scope. Any subordinate instruments that extend or restrict the application of this directive are not specified within the text.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105, includes an Airworthiness Directive (AD/B737/93) concerning the galley feeder wiring of Boeing 737 Series aeroplanes. This directive (Section 1) applies to all 737-200, -300, -400, and -500 models equipped with specific Sabena Technics galleys, identified by particular part numbers. The directive mandates two main actions: first, an inspection of the galley feeder wire bundles for chafing in accordance with Sabena Service Letter SAB 24-001 Revision C dated 27 March 1995 (Section 2.1), and if necessary, the repair, replacement, or repositioning of the wire bundles following the same service letter. Second, the directive requires the modification of the galley feeder wire bundles in line with the aforementioned service letter (Section 2.2). The directive references a Belgian AD 95-01 dated 25 April 1995 for additional context. In terms of compliance, the directive stipulates two timeframes. The initial inspection and any necessary repairs, replacements, or repositionings must be completed within 300 hours of time in service after 14 September 1995 (Section 3.1). Subsequently, the modification of the galley feeder wire bundles must be accomplished within 3600 hours of time in service after the same date (Section 3.2). This phased approach ensures that affected aircraft are addressed promptly and comprehensively. The directive stems from an incident where a Boeing 737-300 operator experienced smoke and sparks from the ceiling panel above the galley, traced back to a severed wire bundle caused by melting due to chafed wiring short-circuiting (Section 4). This Airworthiness Directive aims to detect such chafing early, thereby preventing similar incidents and ensuring the continued airworthiness and safety of the affected aircraft. Under the Civil Aviation Regulations 1998, non-compliance with the Airworthiness Directive could lead to significant consequences. Operators who fail to adhere to the specified inspection and modification schedules may face enforcement actions, which could include civil penalties or criminal charges. The maximum penalties for such breaches are not explicitly stated in the directive but can be severe under broader aviation safety laws, potentially involving substantial fines and imprisonment for individuals responsible for the oversight. Failure to comply with this directive could also have operational repercussions, including the potential grounding of non-compliant aircraft, which could lead to significant financial losses for operators and delays in service delivery. Ensuring compliance is therefore not only a legal obligation but also a critical safety measure to protect passengers and crew.