AD/B747/298 Amdt 2 - Thrust Reverser System Locks (Cth)

AIRWORTHINESS DIRECTIVE On the effective date specified below, and for the reasons set out in the background section, the CASA delegate whose signature appears below repeals Airworthiness Directive (AD) AD/B747/298 Amdt 1 and issues the following AD under subregulation 39.001 (1) of CASR 1998 and subsection 33 (3) of the Acts Interpretation Act 1901. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct an 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/B747/298 Amdt 2 Thrust Reverser System Locks 10/2014

Applicability: Boeing Model 747-400 series aeroplanes powered by General Electric (GE) Model CF6-80C2 series engines. Requirement: 1. Perform a functional test to detect discrepancies of the centre drive unit (CDU) cone brake on each thrust reverser as follows: a. For 747-400 series aeroplanes equipped with thrust reversers that have not been modified in accordance with Boeing Service Bulletin (SB) 747-78-2151 or a production equivalent - Perform the test in accordance with Boeing SB 747-78A2166, Revision 1, dated 9 October 1997; or paragraph 3.C. of Boeing Alert Service Bulletin (ASB) 747-78A2166, Revision 2, dated 15 March 2001; or the applicable section of paragraph III.A. of the Accomplishment Instructions of Boeing SB 747-78A2113, Revision 2, dated 8 June 1995; or Revision 3, dated 11 September 1997. b. For 747-400 series aeroplanes equipped with thrust reversers that have been modified in accordance with Boeing SB 747-78-2151 or a production equivalent - Perform the test in accordance with paragraph 3.C. of ASB 747-78A2166, Revision 2. Note 1: Model 747-400 series aeroplanes, line numbers 1061 and subsequent, equipped with GE CF6-80C2 engines, had a third locking system installed during production in accordance with PRR 80452-102, and were not modified in accordance with Boeing SB 747-78-2151 (which is a retrofit action for aeroplanes having line numbers 700 through 1060 inclusive). Note 2: Where reference to Boeing SB 747-78-2151 is made in this Directive it means SB 747-78-2151 original issue or Revision 1 or Revision 2. Note 3: Accomplishment of the functional test of the CDU cone brake, as specified in Requirement 1, constitutes terminating action for the repetitive tests of the CDU cone brake required by AD/B747/277 Amdt 2 Requirement 2 (paragraph (b)(1) of FAA AD 94-15-05).