AD/B767/71 Amdt 1 - Inspection of Engine, APU & Cargo Compartment Fire Extinguisher Bottle Cartridges

Overview

The Civil Aviation Regulations 1998, specifically Part 39 - 105 concerning the Civil Aviation Safety Authority's Schedule of Airworthiness Directives, address the critical safety issue of ensuring that Boeing 767 series aeroplanes are equipped with functional fire extinguishing systems. Enacted by the Parliament of Australia, this legislation aims to mitigate risks associated with potential failures in fire suppression capabilities due to damaged components within the fire extinguishing systems. The problem this legislation addresses includes reports of bent pins in discharge cartridges and damaged electrical connectors on fire extinguisher bottles, which could result in the extinguishers not discharging in the event of a fire. The policy objective is to mandate thorough visual inspections of the relevant components, ensuring the operational integrity of the fire extinguishing systems onboard aircraft. The Civil Aviation Safety Authority, under the authority of the Civil Aviation Act 1988, issues airworthiness directives to address safety deficiencies in aircraft design, construction, and maintenance. This particular directive requires all operators of Boeing 767 series aeroplanes to conduct a visual inspection of the discharge cartridges and electrical connectors on fire extinguisher bottles in the auxiliary power unit, lower cargo, and engine fire extinguishing systems. The directive mandates that if any damage is detected, the damaged items must be replaced and the fire bottle discharge cartridge circuit must be tested operationally. The aim is to prevent any undetected failures in the fire extinguishing systems, thereby enhancing the overall safety of air travel.

Scope and Application

The Civil Aviation Regulations 1998, specifically under Part 39 - 105, establishes Airworthiness Directives which are binding for all aircraft operating in Australia. This particular Airworthiness Directive (AD/B767/71 Amdt 1) applies to all Boeing 767 series aeroplanes, as identified in Boeing ASB 767-26A0089 dated 22 October 1992. The directive mandates a thorough visual inspection of the discharge cartridges (squibs) and electrical connectors installed on each fire extinguisher bottle in the auxiliary power unit, lower cargo, and engine fire extinguishing systems. This inspection is crucial to ensure that any damage to these components, which could potentially prevent the fire extinguisher from discharging during an emergency, is identified and rectified before further flight. The directive emphasises that while operational tests of the discharge cartridges are not required prior to the inspection, any detected damage necessitates the replacement of the affected item and an operational test of the discharge cartridge circuit. The directive was prompted by reports of bent pins in discharge cartridges and damaged electrical connectors, which were not detectable by the existing operational tests. Compliance with this directive must be achieved unless the inspections have already been performed before 30 November 1993.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105, detail the Civil Aviation Safety Authority’s (CASA) schedule of airworthiness directives for certain aircraft types. For Boeing 767 Series aeroplanes, AD/B767/71 Amendment 1 mandates the inspection of engine, auxiliary power unit (APU), and cargo compartment fire extinguisher bottle cartridges. The directive applies to all model 767 aircraft as identified in Boeing ASB 767-26A0089 dated 22 October 1992. The primary requirement is a visual inspection of the discharge cartridges (squibs) and electrical connectors on each fire extinguisher bottle in the specified systems. Operational tests of the discharge cartridges are not required prior to the visual inspection, but if any damage is found, the damaged item must be replaced and an operational test performed before further flights. The obligations under this directive are clear and specific. Operators of Boeing 767 aircraft must ensure that the visual inspection of the fire extinguisher bottle cartridges and electrical connectors is conducted in accordance with Boeing Alert Service Bulletin 767-26A0089 dated 22 October 1992. If damage is detected during the inspection, the damaged items must be replaced, and an operational test must be conducted to verify the functionality of the discharge cartridge circuit. These inspections must be completed prior to 30 November 1993 unless they have already been performed. The directive aims to address issues where bent pins in discharge cartridges and damaged electrical connectors have been reported, which could prevent the fire bottle from discharging, despite passing operational tests. This one-time inspection ensures that the fire extinguisher bottles are capable of proper discharge in the event of a fire. Failure to comply with the requirements of AD/B767/71 Amendment 1 could result in serious safety risks. Although the Civil Aviation Regulations 1998 do not explicitly state penalties for non-compliance in this context, CASA may take enforcement actions against operators who fail to adhere to airworthiness directives. Such actions could include fines, suspension or revocation of the aircraft's certificate of airworthiness, and potential criminal charges if negligence is proven. Non-compliance could also lead to operational disruptions and compromise the safety of the aircraft and its occupants.