Commonwealth legislation

AD/B737/92 - Thrust Reverser Fan Cowl Firewall

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Commonwealth

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legislative instrument

Plain English Summary

3/10 complexity

This AD requires owners/operators of certain Boeing 737-300/-400/-500 aeroplanes (line numbers 2137–2271) to inspect the thrust‑reverser fan‑duct cowl inner wall for the correct fireproof insulation topcoat and carry out any corrective work per Boeing Alert Service Bulletin 737‑78A1056, scheduled at the next “C” check (or by 31 Dec 1996). It was issued after Boeing reported a weight‑saving insulation change that no longer met certification; costs and downtime are for the operators.

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AD/B737/92 - Thrust Reverser Fan Cowl Firewall

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Boeing 737 Series Aeroplanes

AD/B737/92 Thrust Reverser Fan Cowl Firewall 10/95

Applicability: Boeing 737-300, -400, and -500 series aircraft with line numbers 2137 through 2271 inclusive.

Requirement: 1. Inspect the inner wall of the thrust reverser fan duct cowl in accordance with Boeing Alert Service Bulletin 737-78A1056 to determine if the correct firewall insulation topcoat material is present and rectify as required.

Note: FAA AD 95-09-01 also refers.

Compliance: 1. Unless previously accomplished, at next “C” check but no later than 31 December 1996.

Background: Boeing has advised that a change to the fireproof insulation on the thrust reverser fan duct firewall to decrease aircraft weight has resulted in the firewall not meeting certification requirements.

Source text

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

1 AD/B737/92 - Thrust Reverser Fan Cowl Firewall