1AD/B747/249 - Engine Thrust Control Cables

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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.

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Boeing 747 Series Aeroplanes

AD/B747/249 Engine Thrust Control Cables 7/2001

Applicability: Boeing Model 747-100, -200B, -200C, -200F and -300 series aeroplanes equipped with Pratt and Whitney Model JT9D-3 or –7 series engines, General Electric Model CF6-45 or –50 series engines, or Rolls-Royce Model RB 211-524 B, C or D series engines; delivered in or modified into stretched upper deck (SUD) configuration and having angle assemblies with Boeing part numbers 015U0454-63 and 015U0454-64 installed at body station 970.

Requirement: 1. Perform a detailed visual inspection and measure the clearance between the engine thrust control cables and the cable penetration holes in accordance with the Cable Chafing Inspection of the Accomplishment Instructions of Boeing Service Bulletin (SB) 747-53-2327, Revision 2. If the clearance is within the limits specified by the SB, no further action is required by this AD.

2. If, during compliance with Requirement 1, insufficient clearance as specified in SB 747-53-2327 Revision 2 exists, accomplish:

(a) Modify the cable penetration holes or replace the plate, as applicable, in accordance with Figure 7 of the SB, and

(b) Perform a detailed visual inspection of the engine thrust control cables in the area of the plate to detect wear and broken wires in accordance with Appendix A of this AD. If any wear outside the criteria contained in Appendix A of this AD is found, replace the cable with a new cable, in accordance with procedures described in the Boeing 747 Maintenance Manual. If wear is within the criteria contained in Appendix A of this AD, no further action is required by this paragraph.

Note: FAA AD 2000-12-15 Amendment 39-11962 refers

Compliance: 1. Unless already accomplished, within 12 months from the effective date of this Directive.

2. Unless already accomplished, prior to further flight if insufficient clearance exists as specified in the SB 747-53-2327 Revision 2, after the inspection as per Requirement 1.