AD/B727/84 Amdt 3 - Main Landing Gear Lock System

Overview

The Civil Aviation Regulations 1998, administered by the Civil Aviation Safety Authority (CASA), were enacted to ensure the safety and efficiency of civil aviation within Australia. Within this framework, Part 39, specifically 105, deals with Airworthiness Directives that ensure the continuing airworthiness of aircraft. This particular directive, AD/B727/84 Amendment 3, targets the Boeing 727 Series Aeroplanes and focuses on the main landing gear lock system. The directive was introduced to address the issue of potential failure in the main landing gear lock system, which could compromise the aircraft's safety. Boeing Service Bulletin 727-32-0237 Rev 4 outlines the required action to mitigate these risks. The directive mandates compliance by all models up to line number 1125 and requires action to be completed by 31 December 1988. This legislative instrument aims to enhance aviation safety by ensuring that critical components of the landing gear system are maintained and monitored effectively.

Scope and Application

The Civil Aviation Regulations 1998, as amended, under the jurisdiction of the Civil Aviation Safety Authority (CASA) and applicable across the Commonwealth of Australia, include detailed regulations concerning the airworthiness of aircraft, such as the Boeing 727 Series Aeroplanes. Specifically, Part 39 - 105 of these regulations addresses Airworthiness Directives, which are binding orders issued by CASA to ensure the continued airworthiness of aircraft. The directive AD/B727/84 Amendment 3 pertains to the Main Landing Gear (MLG) Lock System of Boeing 727 Series aeroplanes, specifically for all models up to line number 1125. The directive requires compliance with Boeing Service Bulletin 727-32-0237 Revision 4, referencing FAA AD 79-04-01 Revision 3 for earlier issues. The requirement mandates that corrective action be taken on the MLG lock system to address identified safety concerns, including the replacement of higher strength components, following reports of missing nuts and the loss of a bolt. Compliance with these directives must be achieved before 31 December 1988 to maintain the airworthiness of the affected aircraft within the Australian jurisdiction.

Key Provisions

The Civil Aviation Regulations 1998 (Cth), specifically in Part 39 - 105, pertain to the Civil Aviation Safety Authority (CASA) Schedule of Airworthiness Directives, which include crucial safety instructions for aircraft operations. For Boeing 727 Series Aeroplanes, one such directive is AD/B727/84 Amendment 3, which addresses the Main Landing Gear (MLG) Lock System (section 1). This directive applies to all models up to line number 1125 (section 2), and mandates that actions be taken in accordance with Boeing Service Bulletin 727-32-0237 Revision 4 (section 3). It is important to note that this directive references FAA AD 79-04-01 Revision 3 for earlier issues (section 4). The primary requirement is to ensure compliance with these directives before 31 December 1988 (section 5). The obligations imposed by this Airworthiness Directive include ensuring that the MLG lock system on Boeing 727 aeroplanes is modified to include higher strength components as specified. This involves inspecting and potentially replacing or reinforcing parts of the MLG lock system to prevent issues such as missing nuts and bolt loss, which have been reported post the initial modifications (section 6). Operators of these aircraft are responsible for conducting the necessary inspections and modifications as outlined in Boeing Service Bulletin 727-32-0237 Revision 4 and must document compliance with these directives. This is to ensure the continued airworthiness and safety of the aircraft in accordance with regulatory standards (section 7). Failure to comply with the requirements set forth in this Airworthiness Directive can result in severe consequences. Non-compliance may lead to the grounding of the affected aircraft until the necessary modifications are made (section 8). Additionally, operators and maintenance personnel who fail to adhere to these directives can face legal action under the Civil Aviation Act 1988 (Cth). The penalties for such breaches can include substantial fines, with the exact amount determined by the court based on the severity of the breach (section 9). In extreme cases, where non-compliance results in an accident or significant safety hazard, criminal charges may be pursued against the responsible parties, potentially leading to imprisonment (section 10).