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AD/B737/289 - Fuel Shutoff Valve Wiring and Conduit Assemblies
Boeing 737 Series AeroplanesBoeing 737 Series Aeroplanes
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Boeing 737 Series Aeroplanes
| AD/B737/289 | Fuel Shutoff Valve Wiringand Conduit Assemblies | 8/2006 |
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| Applicability: | Model 737-600, -700, -700C, -800 and -900 series aeroplanes, as listed in Boeing Special Attention Service Bulletin (SB) 737-28-1199, Revision 1, dated15 December 2005. |
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| Requirement: | Replace the fuel shutoff valve wires and conduit assemblies in the left and right engine strut aft fairing areas with new fuel shutoff valve wires and conduit assemblies, in accordance with the Accomplishment Instructions of Special Attention SB 737-28-1199, Revision 1. |
| Actions accomplished before the effective date of this Directive in accordance with Special Attention Service Bulletin 737-28-1199, dated 9 September 2004, are considered acceptable for compliance with the applicable action specified in 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 2006-12-11, are considered acceptable for compliance with the equivalent Requirements of this Directive. | |
| Note: FAA AD 2006-12-11 Amdt 39-14636 refers. | |
| Compliance: | Within 36 months after the effective date of this Directive. |
| This Airworthiness Directive becomes effective on 3 August 2006. | |
| Background: | The FAA has received a report that an operator discovered many small chafe marks and exposed shield braid on fuel shutoff wires routed through a conduit in the wing. Exposed wires could provide an ignition source in a flammable leakage zone and possibly lead to an uncontrolled fire or explosion. |
| This Directive requires replacing the fuel shutoff valve wires and conduit assemblies in the left and right engine strut aft fairing areas. |
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James Coyne
Delegate of the Civil Aviation Safety Authority
21 June 2006