AD/B737/76 - Flight Control Cable Guards

Overview

The Civil Aviation Regulations 1998, specifically Part 39 - 105, was enacted to provide detailed regulations concerning the airworthiness of aircraft, including the issuance of airworthiness directives. This legislation was introduced to address the safety gap associated with the potential failure of flight control cable guards, which could lead to critical flight control issues. The policy objective of this regulation is to ensure the ongoing airworthiness and safety of aircraft by mandating specific maintenance and modification actions as directed by the Civil Aviation Safety Authority (CASA). This particular directive, AD/B737/76, applies to Boeing 737 Series Aeroplanes and requires the replacement of plastic flight control cable guards with aluminium ones, alongside specific relocation and verification tasks to prevent issues such as locked elevator controls and horizontal stabiliser trim that could result from the degradation of the cable guards. The Australian Government, through the Civil Aviation Safety Authority, implemented this directive to align with international safety standards and mitigate the risks identified by the Federal Aviation Administration (FAA) in their Airworthiness Directive 93-01-27. The directive mandates compliance by a specific date to ensure that all affected aircraft meet the required safety standards, thereby protecting passengers, crew, and the general public from potential hazards arising from compromised flight control systems.

Scope and Application

The Civil Aviation Regulations 1998, specifically PART 39 - 105, which includes the Civil Aviation Safety Authority Schedule of Airworthiness Directives, applies to Boeing 737 Series Aeroplanes, namely the 737-100, -200, -300, and -400 series up to line number 1869. This directive is concerned with flight control cable guards, as outlined in AD/B737/76. It mandates that operators replace plastic flight control cable guards with aluminium ones, following Boeing Service Bulletin 737-27A1164 Revision 1, and requires the removal and relocation of pre-existing aluminium cable guards to specific positions between body stations 947.5 and 967, while ensuring proper installation of grommets. Compliance with these requirements must be achieved prior to 9 March 1997. This directive extends to the entire Commonwealth of Australia and applies to all commercial and non-commercial aviation operators within its jurisdiction. There are no exclusions or exemptions specified in the text, but further details and possible modifications may be included in subordinate instruments or additional amendments.

Key Provisions

The Civil Aviation Regulations 1998, specifically under Part 39 - 105, address the safety requirements for certain types of aircraft, particularly the Boeing 737 series aeroplanes. One such regulation is AD/B737/76, which pertains to flight control cable guards (Section 5/93). This directive applies to Boeing 737-100, -200, -300, and -400 series aeroplanes up to line number 1869. The key requirement of this directive is the replacement of plastic flight control cable guards with aluminium cable guards, in accordance with Boeing Service Bulletin 737-27A1164 Revision 1. Additionally, any previously installed aluminium cable guards at a specific location must be removed and relocated to another specified position, with proper installation of grommets at all locations. This relocation is also in accordance with the same service bulletin. Entities governed by these regulations, such as airlines and maintenance providers, must ensure compliance with the specified changes to the flight control cable guards. This involves replacing the plastic guards with aluminium ones and relocating any existing aluminium guards to the correct position, ensuring that all grommets are properly installed. This requirement is critical to maintaining the safety and integrity of the aircraft's flight control systems. Compliance with these directives is not only a legal obligation but also a safety imperative to prevent issues such as locked controls and horizontal stabiliser trim, which can lead to serious aviation incidents. Failure to comply with these directives can result in significant consequences. While the specific penalties are not detailed in the provided text, non-compliance with Civil Aviation Regulations can generally lead to enforcement actions by the Civil Aviation Safety Authority (CASA). These actions may include fines, suspension or revocation of operating certificates, and other regulatory penalties. Additionally, non-compliance can result in criminal charges if the failure to adhere to the regulations is deemed to have contributed to an aviation accident or incident. Therefore, it is crucial for all parties governed by these regulations to ensure strict adherence to the specified safety directives.