1AD/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.