1AD/B747/201 Amdt 3 - Centre Fuel Tank Wiring and Components

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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 revokes Airworthiness Directive (AD) AD/B747/201 Amdt 2 and issues the following AD under subregulation 39.1 (1) of CASR 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/B747/201

Amdt 3

Centre Fuel Tank Wiring and Components 13/2004

Applicability: Model 747 aeroplanes having line numbers 1 through 1124 inclusive.

Requirement: 1. For aeroplanes listed in Boeing Service Bulletin (SB) 747-28-2205 Revision 1 dated 16 April 1998 accomplish the following in accordance with either SB 747- 28-2205 Revision 1 dated 16 April 1998 or Revision 2 dated 17 May 1999:

perform a one-time visual inspection of the centre fuel tank wiring and components to detect discrepancies (damage, disbonding or incorrect installation), and

b. perform a one-time electrical bonding test of the centre fuel tank components.

Note 1: For the purposes of this Directive, a visual inspection is considered to be a general visual inspection defined as follows:

A visual examination of an interior or exterior area, installation or assembly to detect obvious damage, failure or irregularity. This level of inspection is made under normally available lighting conditions such as daylight, hangar lighting, flashlight, or drop-light and may require removal or opening of access panels or doors. Stands, ladders, or platforms, may be required to gain proximity to the area being checked.

2. If, during the Requirement 1.a. visual inspection, any discrepancy is detected, either repair the discrepant component or replace it with a new or serviceable component.

3. If, during the Requirement 1.b. electrical bonding test, any measured resistance exceeds the limits specified in the service bulletin, rework the discrepant component.

Note 2: Actions performed in accordance with SB 747-28-2205, dated 27 June 1997, accomplished prior to the effective date of this Directive or its original issue, are considered acceptable for compliance only with the corresponding applicable actions specified in this Directive. This excludes certain actions that are not described in that bulletin, such as inspection and testing of the body fuel tank components that are described in Revision 1 of SB 747-28-2205. Regardless of which version of the service bulletin is used to detect any discrepancies, the repair and replacement requirements of this Directive apply.