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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/B747/265  Passenger Service Units Electrical Wire Bundle Chafing

2/2002

 

Applicability: Model 747 series aeroplanes, as listed in Boeing Alert Service Bulletin (ASB) 747- 35A2035, Revision 1, dated 22 July 1999.

 

Requirement: 1. Perform a detailed visual inspection for chafing between oxygen hoses and electrical wire bundles at the passenger service units (PSU) in the main deck passenger compartment, upper deck sculpted ceiling, personnel accommodation (crew rest) area, lower lobe forward galley, and aft galley. Inspections are to be performed in accordance with ASB 747-35A2035, Revision 1, as revised by Boeing Service Bulletin Information Notice 747-35A2035 IN 01, dated 23 September 1999.

 

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 discrepancies are detected, complete any necessary repairs as specified in Requirement 2.a. and/or 2.b., as applicable. Additionally, reroute the oxygen hose or install an elbow at the oxygen mask inlet connector to reorient the oxygen hose away from the electrical wiring to ensure a minimum of 2 inches clearance between the oxygen hose and electrical wire bundle, in accordance with ASB 747-35A2035, Revision 1.