AD/B737/3 - A.P.U. Generator, Feeder Wire Bundle - Inspection

Overview

The Civil Aviation Regulations 1998, as amended, address the critical issue of ensuring the safety and reliability of civil aviation in Australia. Specifically, Part 39 – 105, which pertains to the Civil Aviation Safety Authority Schedule of Airworthiness Directives, was enacted to safeguard the aviation industry by establishing mandatory safety standards and directives. This legislative instrument responds to identified gaps in aircraft safety protocols and seeks to mitigate risks associated with specific aircraft models. The objective of these regulations is to ensure that all civil aviation operations within Australian airspace adhere to stringent safety standards, thereby protecting the public and maintaining the integrity of the aviation industry. The Civil Aviation (Safety) Regulations 1998 are administered by the Civil Aviation Safety Authority (CASA) under the authority of the Civil Aviation Act 1988. The policy objective is to mandate regular inspections and maintenance of critical aircraft components to prevent mechanical failures and enhance overall flight safety. For example, Airworthiness Directive AD/B737/3 focuses on the Boeing 737 series aeroplanes, requiring inspections of the A.P.U. generator feeder wire bundle to prevent interference with control cables, thereby averting potential accidents.

Scope and Application

The Civil Aviation Regulations 1998, specifically PART 39 - 105, pertain to the Civil Aviation Safety Authority's (CASA) schedule of airworthiness directives for the Boeing 737 series aeroplanes. This regulation applies to all model 737 aircraft with specific serial numbers outlined in the requirement document. It mandates the inspection of the Auxiliary Power Unit (A.P.U.) generator feeder wire bundle for any interference with control cables, to be conducted prior to further flight after 30 November 1984, and each time the A.P.U. generator circuit breaker is removed. The directive references Boeing Service Bulletin 737-24-1038 and FAA AD 84-10-04 Amendment 39-4872, and compliance with these inspections is critical to prevent the previously observed issues of control cable abrasion and arcing. The scope of the directive is limited to the specified aircraft models and does not extend to other types of aircraft or aircraft components. The regulation operates under the jurisdiction of the Commonwealth of Australia, ensuring a consistent standard across all applicable aircraft within the nation's airspace.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39, Section 105, contain detailed provisions concerning the airworthiness directives for Boeing 737 series aeroplanes. Within this part, AD/B737/3 pertains to the A.P.U. (Auxiliary Power Unit) generator feeder wire bundle, mandating a particular inspection protocol to prevent interference with control cables. The directive applies to all model 737 aircraft with serial numbers specified in the Requirement Document (Section 105.1). The key requirement outlined in this directive is that the A.P.U. generator feeder wire bundle must be inspected for any interference with control cables before any further flight after 30 November 1984, as detailed in the Requirement Document (Section 105.2). This inspection must be repeated each time the A.P.U. generator circuit breaker is removed (Section 105.3). The directive references Boeing Service Bulletin 737-24-1038 and Federal Aviation Administration AD 84-10-04 Amendment 39-4872 for further details. The Civil Aviation Regulations impose clear obligations on the operators and owners of Boeing 737 aircraft covered by this directive. These obligations include conducting the specified inspections of the A.P.U. generator feeder wire bundle to ensure there is no interference with the control cables. Operators must adhere to the inspection protocol and ensure compliance with the requirements before permitting any further flight. Additionally, if the A.P.U. generator circuit breaker is removed at any point, a repeat inspection must be conducted (Section 105.2, 105.3). The regulations mandate that any modifications to the feeder wire bundle installation must be made in accordance with Boeing Service Bulletin 737-24-1038 to terminate the requirement of the directive. Failure to comply with the airworthiness directive AD/B737/3 can result in significant consequences. Non-compliance may lead to potential safety hazards, such as the interference and resultant damage to control cables as documented in the background of the directive. Under the Civil Aviation Regulations, breaches of these safety requirements can lead to enforcement actions by the Civil Aviation Safety Authority (CASA). While the specific penalties are not detailed within the directive itself, penalties for non-compliance with airworthiness directives can include fines and other sanctions under the Civil Aviation Act 1988, reflecting the serious nature of ensuring aircraft safety. Operators and owners must ensure strict adherence to avoid any potential legal or safety repercussions.