COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Boeing 737 Series Aeroplanes
AD/B737/46 Engine Fire/Overheat Detection System 10/90
Applicability: All model 737-300 and 737-400 series aircraft fitted with Kidde engine fire and overheat detection systems as listed in Boeing SB 737-26-1055 Revision 1.
Requirement: Modify the engine fire and overheat detection system in accordance with Boeing SB 737-26-1055 Revision 1.
Note: FAA AD 90-15-14 also refers.
Compliance: Prior to 4 April 1992.
Background: Boeing have advised that multiple reports have been received from operators describing short circuits in the engine fire detection system which have resulted in false fire warnings. The problem has been attributed to contamination in the electrical connectors at the detector sensor unit. Action in accordance with this AD is necessary to reduce false fire warnings which may result in unnecessary engine shut down which could unduly jeopardise continued safe flight of the aircraft.
Overview
The Civil Aviation Regulations 1998, which were enacted by the Parliament of the Commonwealth of Australia, are pivotal in ensuring the safety and regulation of civil aviation in the country. Specifically, Part 39 - 105 of these regulations, which includes Airworthiness Directives, addresses critical safety measures to maintain the airworthiness of aircraft. One such directive, AD/B737/46, was introduced to address the specific problem of false fire warnings in Boeing 737 Series Aeroplanes, particularly the 737-300 and 737-400 models equipped with Kidde engine fire and overheat detection systems. This directive was enacted in response to multiple reports from operators detailing short circuits in the engine fire detection system, attributed to contamination in the electrical connectors at the detector sensor unit. The policy objective of this directive is to ensure the continued safe flight of the aircraft by mitigating the risk of unnecessary engine shutdowns caused by these false alarms.
Scope and Application
The Civil Aviation Safety Authority's regulation, as outlined in the Civil Aviation Regulations 1998, applies specifically to all Boeing 737-300 and 737-400 series aircraft that are equipped with Kidde engine fire and overheat detection systems, as referenced in Boeing Service Bulletin 737-26-1055 Revision 1. This regulatory directive is aimed at ensuring the continued safety of these aircraft by addressing a known issue of short circuits in the engine fire detection system that have led to false fire warnings. The requirement is to modify the engine fire and overheat detection system in accordance with Boeing Service Bulletin 737-26-1055 Revision 1, with a compliance deadline set prior to 4 April 1992. The regulation extends to any operator of the specified aircraft models within Australia and its territories, ensuring a national standard of compliance to mitigate risks associated with the identified safety issue. The regulation may also be extended or further detailed through subordinate instruments issued by the Civil Aviation Safety Authority.
Key Provisions
The Civil Aviation Regulations 1998, specifically Part 39 - 105, detail the Civil Aviation Safety Authority's (CASA) Schedule of Airworthiness Directives. Under this legislation, AD/B737/46 pertains to Boeing 737 Series Aeroplanes, focusing on the Engine Fire/Overheat Detection System for model 737-300 and 737-400 aircraft equipped with Kidde engine fire and overheat detection systems as specified in Boeing Service Bulletin 737-26-1055 Revision 1. The directive mandates that these systems must be modified in accordance with the referenced service bulletin (section 10/90). This requirement aims to address reported issues of short circuits in the engine fire detection system, which have led to false fire warnings due to contamination in the electrical connectors at the detector sensor unit.
Operators of the affected Boeing 737 models must comply with the directive by implementing the necessary modifications to the engine fire and overheat detection system before 4 April 1992, as stipulated in the regulation (section 10/90). The modifications are intended to mitigate the risk of false fire warnings that could result in unnecessary engine shutdowns, thereby ensuring the continued safe flight of the aircraft. It is imperative that these modifications are performed to maintain the airworthiness of the aircraft as required by CASA.
Failure to comply with AD/B737/46 may result in serious consequences, including potential safety risks during flight operations. While the specific penalties or consequences for non-compliance are not detailed in the text, it is understood that regulatory non-compliance can lead to enforcement actions by CASA. These actions may include fines, operational restrictions, or other regulatory measures designed to ensure adherence to safety standards. The severity of penalties may vary depending on the extent and impact of the non-compliance, as well as any resultant safety incidents.
The directive underscores the importance of maintaining the integrity of engine fire and overheat detection systems to prevent false alarms that could compromise flight safety. Operators are thus obligated to act promptly in modifying their systems to align with the regulatory requirements. Ensuring compliance with AD/B737/46 is crucial for the safe operation of Boeing 737-300 and 737-400 series aircraft, and for upholding the high safety standards mandated by CASA.