Boeing 747 Series Aeroplanes
Boeing 747 Series Aeroplanes
Boeing 747 Series Aeroplanes
| AD/B747/327 | Engine Fuel Feed System Electrical Bonding | 5/2005 |
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| Applicability: | Model 747 series aeroplanes as follows: |
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| 747SP, 747SR, 747-100, -100B, -100B SUD, -200B, -200C, -200F, -300, -400,-400D, and -400F series aeroplanes listed in Boeing Alert Service Bulletin (ASB) 747-28A2239, Revision 1, dated 17 October 2002; and | |
| 747-400 and -400F series aeroplanes listed in Boeing ASB 747-28A2245, Revision 1, dated 21 August 2003. | |
| Requirement: | 1. Action in accordance with paragraph 3.B. of ASB 747-28A2239, Revision 1 or ASB 747-28A2245, Revision 1, as applicable. |
| 2. Carry out any necessary corrective actions on deficiencies detected during the accomplishment of Requirement 1. | |
| Note 1: Operators may use their own CASA accepted equivalent procedures for draining the fuel tanks and gaining access to the fuel tanks. | |
| Note 2: Actions accomplished before the effective date of this Directive in accordance with Boeing ASB 747-28A2239 dated 29 November 2001 or ASB 747-28A2245 dated 26 November 2001 are acceptable for compliance with this Directive. | |
| Note 3: FAA AD 2005-04-01 Amdt 39-13973 refers. | |
| Compliance: | For Requirement 1 - Before 12 May 2010. |
| For Requirement 2 - Before further flight after accomplishing Requirement 1. | |
| This Airworthiness Directive becomes effective on 12 May 2005. |
| Background: | The United States Federal Aviation Administration has determined that is necessary to reduce the potential for ignition sources inside fuel tanks. This Directive is issued to prevent arcing or sparking at the interface between the bulkhead fittings of the engine fuel feed tube and the front spar inside the fuel tank of the wings and between the overwing fuel fill ports and the aeroplane structure during a lightning strike. Such arcing or sparking could provide a possible ignition source for the fuel vapour inside the fuel tank and cause consequent fuel tank explosions. |
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James Coyne
Delegate of the Civil Aviation Safety Authority
31 March 2005