Commonwealth legislation

AD/B747/191 - Engine Fire Detection

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legislative instrument

Plain English Summary

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This airworthiness directive requires Boeing 747 aeroplanes with Rolls‑Royce RB211‑524G/H engines to have their engine fire‑detection systems modified in line with Boeing Alert Service Bulletin 747‑26A2250 (dated 26 June 1997). Compliance must occur at the engine's next shop visit and no later than 5 November 2003.

The change responds to a reported combustor burn‑through that could disable cockpit fire warnings; the modification is intended to restore reliable annunciation. Aircraft operators/engine owners must arrange and pay for the work and accept associated downtime.

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AD/B747/191 - Engine Fire Detection

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Boeing 747 Series Aeroplanes

AD/B747/191 Engine Fire Detection 12/98

Applicability: Model 747 series aeroplanes fitted with Rolls-Royce RB211-524G/H engines. Requirement: Modify the engine fire detection system in accordance with Boeing Alert Service

Bulletin 747-26A2250 dated 26 June 1997.

Note: FAA AD 98-17-13 Amdt 39-10715 and Rolls-Royce PLC Service Bulletin RB.211-26-C101 refer.

Compliance: At the next engine shop visit of the engine but no later than 5 November 2003.

This Airworthiness Directive becomes effective on 5 November 1998.

Background: The FAA has received a report advising of a combuster burn-through event that damaged the engine fire detection system such that no fire warning was annunciated on the flight deck. This directive implements a modification which is intended to prevent failure of the engine fire detector system to annunciate a fire warning message to flight crew following a severe engine failure. Failure to annunciate a fire warning could lead to delayed or improper flight crew response to the engine failure.

Source text

Sourced from the Federal Register of Legislation (legislation.gov.au), CC BY 4.0.

1 AD/B747/191 - Engine Fire Detection