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AD/B747/330 - Fuel Spar Shutoff Valve Wiring
Boeing 747 Series AeroplanesBoeing 747 Series Aeroplanes
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Boeing 747 Series Aeroplanes
| AD/B747/330 | Fuel Spar Shutoff Valve Wiring | 9/2005 |
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| Applicability: | Model 747-400, -400D and -400F series aeroplanes, line numbers 1 through 1276 inclusive. |
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| Requirement: | Install a jumper wire between the wiring of the fire extinguisher switch and the fuel shutoff switch for each engine in accordance with the Accomplishment Instructions of Boeing Service Bulletin (SB) 747-28-2238, Revision 1, dated 17 March 2005. |
| Equivalent parts, as determined in accordance with Chapter 20 the Boeing Standard Wiring Practices Manual, may be utilised in lieu of the parts specified in SB747-28-2238, Revision 1. | |
| Accomplishment of the actions required by this Directive before the effective date of this Directive, in accordance with Boeing Special Attention Service Bulletin747-28-2238, dated 18 October 2001 are considered acceptable for compliance with this Directive. | |
| Later revisions of the above SB, approved by the United States Federal Aviation Administration (FAA) as an Alternate Method of Compliance (AMOC) to FAA AD 2005-13-20 are considered acceptable for compliance with the equivalent Requirements of this Directive. | |
| Note: FAA AD 2005-13-20 Amdt 39-14157 refers. | |
| Compliance: | Within 60 months after the effective date of this Directive. |
| This Airworthiness Directive becomes effective on 1 September 2005. |
| Background: | This Directive requires the installation of a jumper wire between the wiring of the fire extinguisher switch and the fuel shutoff switch for each engine. The Directive is issued to prevent a latent open circuit that could leave the fuel spar shutoff valve in a partially open position when the engine fire switch is activated, which could result in fuel from the engine feeding an uncontrolled fire in the engine or the strut. |
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James Coyne
Delegate of the Civil Aviation Safety Authority
19 July 2005