AD/B747/277 Amdt 2 - Thrust Reverser Inspections and Tests (Cth)

AIRWORTHINESS DIRECTIVE

For the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/B747/277 Amdt 1 and issues the following AD under subregulation 39.1 (1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

Boeing 747 Series Aeroplanes

AD/B747/277 Amdt 2

Thrust Reverser Inspections and Tests 1/2004

Applicability: Boeing Model B747-400 series aeroplanes powered by Pratt & Whitney PW 4000 series engines, General Electric CF6-80C2 series engines or Rolls Royce RB211- 524G/H series engines.

Requirement: Note 1: See "Terminating Action" section of AD/B747/230 Amdt 1 and AD/B747/250 Amdt 1.

1. Pratt & Whitney PW4000 series engines:

1. Carry out an inspection to detect damage to the bullnose seal on the translating sleeve of the thrust reverser, and perform a test of the lock mechanism of the centre locking actuator, in accordance with the Accomplishment Instructions contained in:

* Boeing Service Bulletin (SB) 747-78-2112, dated 11 November 1993, or

* Boeing Alert SB 747-78A2112 Revision 1, dated 7 March 1994.

1. Repeat the inspection and tests of Requirement 1(a).

c. Carry out inspections and functional tests of the thrust reverser control and indication systems in accordance with the Accomplishment Instructions in Service Bulletins listed in Requirement 1(a).