AD/GAF-N22/54 - D.C. Power - Generator Cable Termination

Overview

The Civil Aviation Regulations 1998 were enacted to ensure the safety and efficiency of civil aviation within Australia. These regulations, which include Part 39 - 105 concerning Airworthiness Directives, were introduced by the Commonwealth of Australia to address gaps in aviation safety standards and to provide a comprehensive framework for the regulation of civil aviation. One specific directive, AD/GAF-N22/54, focuses on the inspection and maintenance of generator cable terminations in GAF N22 and N24 series aeroplanes, aiming to mitigate the risk of overheating and damage at the firewall terminal lug, as identified by the Australian Safety Transport Authority (ASTA). This directive requires the inspection of cable terminations and the application of warning placards to ensure compliance with safety standards. The overarching policy objective of these regulations is to maintain high safety standards in civil aviation, thereby protecting the public and ensuring the integrity of the aviation industry.

Scope and Application

The Civil Aviation Regulations 1998, under Part 39 - 105 and specifically addressing Airworthiness Directives for the GAF N22 and N24 series aeroplanes, apply to all aircraft of these models. The regulations mandate a comprehensive inspection of the generator cable terminations, requiring removal of the protective covers to assess for any signs of damage due to overheating or loose attachments. Aircraft with a total electrical load exceeding 150 amps must comply with these inspections before their next flight after 21 August 1989, and subsequently before each flight until the modifications specified in Mod N724 are incorporated. For aircraft with a total electrical load not exceeding 150 amps, the inspections must occur prior to exceeding 100 hours of time in service after 21 August 1989. Additionally, a warning placard indicating a maximum single generator current of 75 amps must be affixed to the generator control panel on the overhead console. This directive aims to ensure safety by preventing damage and overheating at the generator firewall terminal lug, which could compromise flight safety. The application of these regulations is governed by the Civil Aviation Safety Authority, extending across the Commonwealth of Australia.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105, details the airworthiness directives for GAF N22 and N24 series aeroplanes, focusing on the generator cable termination as outlined in AD/GAF-N22/54. The main requirement (Section 1) mandates an inspection of the generator cable terminations at both ends of stud P/N-I/N-81-424, which passes through the firewall in the wing leading edge. This involves removing the upper engine cowls and wing leading edge servicing doors to access the connections. Inspectors must pull back the protective covers and check for signs of damage, such as overheating from high electrical resistance, and ensure the security of the cable attachments to the stud. If overheating is detected, all damaged components must be replaced. Additionally, a temporary placard must be affixed to the generator control panel on the overhead console with the specified warning text, "MAXIMUM SINGLE GENERATOR CURRENT NOT TO EXCEED 75 AMPS" (Section 2). Operators and owners of GAF N22 and N24 series aircraft are obligated to ensure compliance with these airworthiness directives. For aircraft with a total electrical load exceeding 150 amps, the inspection and placard application must be completed before the next flight after 21 August 1989 and before each subsequent flight until modification N724 is incorporated. For aircraft with an electrical load not exceeding 150 amps, the inspection must occur before the aircraft exceeds 100 hours in service after 21 August 1989, and the placard must be applied before the next flight after 21 August 1989. These directives are intended to mitigate the risk of severe damage and overheating at the generator firewall terminal lug, which could affect the safety of flight. Failure to comply with the airworthiness directives can result in civil and criminal consequences. The Civil Aviation Safety Authority (CASA) has the authority to take enforcement actions against operators who do not adhere to the specified requirements. Civil penalties may include fines, and in severe cases, CASA can suspend or revoke the aircraft's airworthiness certificate. Additionally, non-compliance could lead to criminal charges under the Civil Aviation Act 1988, with potential penalties such as imprisonment, depending on the severity of the breach and its impact on aviation safety. The exact penalties are determined by the courts, but they can include substantial fines and periods of imprisonment for individuals and corporate entities found guilty of non-compliance.