AD/B747/275 - Thrust Reverser Inspections, Modifications and Tests (Cth)

AIRWORTHINESS DIRECTIVE For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 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/B747/275 Thrust Reverser Inspections, Modifications and Tests

7/2002

Applicability: Model 747 series aeroplanes powered by General Electric CF6-45 or –50 series engines.

Requirement: 1. (a) Carry out the applicable detailed visual inspections and tests of the thrust reverser stow/deploy switches, bullnose seals and airmotor brake on each engine, in accordance with Work Package 1 of the Accomplishment Instructions of Boeing Alert Service Bulletin (ASB)747-78A2160, Revision 1, dated 12 April, 2001; OR

(b) Install a thrust reverser actuation system (TRAS) lock on each thrust reverser half of each engine, in accordance with Boeing Service Bulletin (SB) 747- 78-2150, Revision 1, dated 2 July, 1998. All of the modifications described in the Service Bulletins listed in paragraphs I.K.1.h. and I.K.1.j. of Boeing SB 747-78-2150, Revision 1, must be accomplished, as applicable, in accordance with those Service Bulletins, prior to, or concurrently with, the accomplishment of the installation of the TRAS lock.

2. Repeat applicable detailed visual inspections and tests required by Requirement 1(a).