AD/MU-2/54 - Tip Tank Wiring Conduit

Overview

The Civil Aviation Regulations 1998, specifically within Part 39, establish stringent safety standards for aircraft in Australia, addressing gaps in aircraft safety and maintenance. The legislation was enacted to ensure the safety of civil aviation by providing comprehensive regulations that govern aircraft operations, maintenance, and airworthiness. The Civil Aviation Safety Authority (CASA) is the responsible body for enforcing these regulations, with a policy objective to maintain the highest possible safety standards in the aviation industry. One such regulation, AD/MU-2/54, targets Mitsubishi MU-2 series aeroplanes, focusing on the wiring conduits in the tip tanks to prevent corrosion that could lead to fuel leaks and associated hazards. Compliance with this directive is mandatory to ensure that specific models of the MU-2 series adhere to safety standards, thereby mitigating risks associated with structural and operational integrity. The Mitsubishi MU-2 Series Aeroplanes Airworthiness Directive, part of the broader Civil Aviation Regulations 1998, aims to address the specific problem of corrosion in the wiring conduits of the tip tanks. This issue, if unaddressed, could result in fuel leakage into the wiring conduits, posing significant safety risks. The directive mandates compliance within 100 hours of service from 28 February 1994 for certain serial numbers of MU-2B-10, -15, -20, -25, -26, -30, -35, and -36 models, excluding specific serial numbers, unless corrective action has already been taken as per Mitsubishi MU-2 Service Bulletin No 221. This regulation is crucial in maintaining the airworthiness of these aircraft, thereby upholding the overarching goal of ensuring safe and reliable aviation operations.

Scope and Application

The Civil Aviation Regulations 1998, under Part 39 - 105, pertains specifically to the airworthiness directives concerning Mitsubishi MU-2 series aeroplanes. The regulations apply to specific models and serial numbers of these aircraft, namely MU-2B-10, -15, -20, -25, and -26 serial numbers 008 through 347, excluding serial numbers 313 and 321, as well as MU-2B-30, -35, and -36 serial numbers 501 through 696, excluding serial numbers 652 and 661. The directive mandates that unless a specific action, as detailed in Mitsubishi MU-2 Service Bulletin No 221, has already been undertaken, the requirement must be adhered to. This requirement is aimed at addressing corrosion in the wiring conduit which carries the navigation light and fuel low-level switch wiring, a condition that could potentially result in fuel leakage into the wiring conduit. Compliance with this directive must be achieved within 100 hours of the aircraft being in service from 28 February 1994. The scope of the regulation is national, applying across the Commonwealth of Australia, and enforced by the Civil Aviation Safety Authority.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105, mandate certain safety directives for Mitsubishi MU-2 series aeroplanes. AD/MU-2/54 outlines the requirement for inspection and potential repair of the tip tank wiring conduit (Section 2/94). This directive applies to specific MU-2 models and serial numbers, excluding certain aircraft identified by their serial numbers (Section 2/94). The action required is to inspect and, if necessary, replace the wiring conduit unless the work has already been performed in accordance with Mitsubishi MU-2 Service Bulletin No 221. A reference to JCAB TCD-3901-93 is also provided for additional context (Section 2/94). Compliance with these directives is mandatory and must be achieved within 100 hours of the aeroplane being in service from 28 February 1994. The primary concern addressed by this directive is the risk of corrosion in the wiring conduit, which carries the navigation light and fuel low level switch wiring. This corrosion could potentially lead to fuel leaking into the wiring conduit, posing a significant safety hazard (Section 2/94). The requirement aims to mitigate this risk by ensuring the integrity of the wiring conduit is maintained. Entities governed by this directive, including aircraft operators and maintenance organisations, must ensure that the specified inspections and repairs are carried out as mandated. This involves verifying the aircraft’s serial number to determine applicability, conducting the necessary inspection within the stipulated timeframe, and performing any required repairs or replacements of the wiring conduit. It is also essential to maintain accurate records of compliance to demonstrate adherence to regulatory requirements (Section 2/94). Failure to comply with these directives can result in serious consequences. Non-compliance may lead to the aircraft being grounded until the required actions are taken, potentially disrupting operations and incurring additional costs. Furthermore, regulatory bodies such as the Civil Aviation Safety Authority (CASA) may impose penalties or take enforcement action against non-compliant entities. While the specific penalties are not detailed in the provided text, they can include fines and other civil or criminal sanctions, depending on the severity and frequency of the breach (Section 2/94).