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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 B747 Series Aeroplanes

 

AD/B747/266 Flight Engineer’s Panel Wire Bundle Clamping

2/2002

 

Applicability: Model 747-100, 747-200B, 747-200C, 747-200F, 747SP, and 747SR series aeroplanes; line numbers 001 through 310 inclusive.

 

Requirement: 1. Perform a one-time detailed visual inspection for chafing of wire bundles in the area of the forward upper corner of the P4 flight engineer's panel, outboard of the drip shield, paying particular attention to wire bundles W528 and W530.

 

Note 1: For the purposes of this Directive, a detailed visual inspection is defined as: “An intensive visual examination of a specific structural area, system, installation, or assembly to detect damage, failure, or irregularity. Available lighting is normally supplemented with a direct source of good lighting at intensity deemed appropriate by the inspector. Inspection aids such as mirror, magnifying lenses, etc., may be used. Surface cleaning and elaborate access procedures may be required.”

 

2.        If, as a result of the Requirement 1 inspection, any chafing is found, repair the chafed wire bundles in accordance with Section 20-10-13 of the Boeing Standard Wiring Practices Manual.

 

3.        Modify the aeroplane by rerouting electrical wire bundle W530 to ensure sufficient clearance between that wire bundle and an adjacent flood light support bracket and installing a caterpillar grommet on the flood light supports, in accordance with Boeing Alert Service Bulletin (ASB) 747-25A2407, Revision 1, dated 23 September 1999.