Federal Register of Legislation
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/B747/278 Thrust Reversers 10/2002
Applicability: Model 747 series aeroplanes equipped with Pratt & Whitney JT9D-70 series engines. Requirement: 1. Inspect the thrust reverser wiring on each engine, in accordance with Boeing Alert Service Bulletin (ASB) 747-78A2149, Revision 1, dated 9 May 1996, or Revision 2, dated 29 August 1996, to detect any discrepancies.
2. Repair any discrepancy, detected during the Requirement 1 inspection, in accordance with ASB 747-78A2149, Revision 1 or Revision 2.
3. Accomplish the thrust reverser wiring modification on each engine in accordance with ASB 747-78A2149, Revision 1 or Revision 2.
4. Accomplish the modification of the thrust reverser control system wiring specified in Rohr Service Bulletin (SB) TBC-CNS 78-32, Revision 1, dated 20 August 1996.
5. Perform an operational test of the thrust reverser wiring on each engine to detect discrepancies in accordance with ASB 747-78A2149, Revision 1 or Revision 2.
6. Rectify any discrepancy, detected during the Requirement 5 operational test, in accordance with ASB 747-78A2149 Revision 1 or Revision 2.
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