AD/F100/36 - Fire Extinguisher Electrical Connectors

Overview

The Civil Aviation Regulations 1998, as amended through legislative instrument F2006B09638, introduced specific safety measures to ensure the airworthiness of Fokker F100 (F28 Mk 100) Series aeroplanes. This regulation was enacted to address the problem of shorted electrical connectors in the fire extinguisher systems of these aircraft models, specifically F.28 Mk.0070 and Mk.0100. The Australian Government, through the Civil Aviation Safety Authority (CASA), issued this directive to mitigate the risk of fire extinguisher systems being disabled due to uninsulated solder connectors, which can lead to short circuits. The policy objective of this directive is to enhance aviation safety by ensuring that any identified electrical faults in the fire extinguisher systems are promptly detected and rectified. The directive mandates that within 12 calendar months from its effective date of 31 December 1999, all Fokker F100 aeroplanes must undergo a series of inspections and modifications to their fire extinguisher electrical connectors. This includes performing resistance checks and, if necessary, inspecting and modifying the connectors as outlined in Fokker Service Bulletin SB F100-26-015. Compliance with these requirements is critical to maintaining the safety and reliability of the fire extinguisher systems, thus preventing potential hazards that could compromise the safety of flights.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105, establishes regulations pertaining to airworthiness directives for aircraft operating within Australia. AD/F100/36 is a directive that applies to Fokker F100 (F28 Mk 100) series aeroplanes, specifically the F.28 Mk.0070 and Mk.0100 models. The directive mandates specific maintenance actions concerning the electrical connectors of engine and auxiliary power unit (APU) fire extinguishers to ensure the safety and operational integrity of the aircraft. Compliance with the directive requires a resistance check on the specified connectors, followed by inspection and necessary modifications if any faults are detected, in accordance with Fokker Service Bulletin F100-26-015. The directive mandates compliance within 12 months from its effective date, before further flight, and at the next scheduled weight check of the fire extinguisher bottle or within two years from the initial check, whichever is sooner. This directive, effective from 31 December 1999, is a direct response to reports of shorted electrical connectors that could potentially disable the fire extinguisher system, thereby necessitating immediate and stringent safety measures.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105, includes an airworthiness directive (AD/F100/36) that pertains to Fokker F100 (F28 Mk 100) Series Aeroplanes. The directive mandates certain actions to ensure the continued safety of F.28 Mk.0070 and Mk.0100 aeroplanes. Firstly, operators are required to perform a resistance check on the engine and auxiliary power unit (APU) fire extinguisher electrical connectors (section 1). This check must adhere to the Accomplishment Instructions of Fokker Service Bulletin (SB) F100-26-015 dated 15 August 1999. Should the resistance check reveal a short circuit, the directive requires the operators to inspect and, if necessary, modify the affected connectors in accordance with Part B (paragraphs C through H) of the Accomplishment Instructions of SB F100-26-015 (section 2). Conversely, if no short circuit is detected, operators must still inspect and, if necessary, modify the affected connectors as specified (section 3). This directive is applicable to conditions previously reported and investigated by Fokker, where APU and engine fire extinguisher electrical connectors were found to be shorted due to inadequate insulation, potentially disabling the fire extinguisher system. Operators of these aircraft must comply with the directive within 12 calendar months from its effective date, before further flight, and at the next scheduled weight check of the fire extinguisher bottle or within two years after the initial check, whichever occurs first. Failure to adhere to these requirements may result in significant safety risks, as the unaddressed condition could lead to the disabling of the fire extinguisher system. Breaching the requirements of this airworthiness directive may result in various civil or criminal consequences. Although specific penalties are not outlined within the directive, the broader Civil Aviation Regulations 1998 include provisions for penalties for non-compliance with airworthiness directives. Operators found in breach of these regulations may face substantial fines and other legal repercussions, underscoring the critical importance of adhering to the stipulated requirements to ensure the continued airworthiness and safety of the aircraft.