AD 98-26-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 757-200 Series | Airworthiness Directives; Boeing Model 757 Series Airplanes |
| aircraft | The Boeing Company | 757-200CB Series | Airworthiness Directives; Boeing Model 757 Series Airplanes |
| aircraft | The Boeing Company | 757-200PF Series | Airworthiness Directives; Boeing Model 757 Series Airplanes |
| aircraft | The Boeing Company | 757-300 Series | Airworthiness Directives; Boeing Model 757 Series Airplanes |
Unsafe Condition
Improperly installed engine fuel shutoff valve assemblies or crossfeed valve assemblies could lead to uncommanded fuel flow from the fuel tanks to the engine nacelle, resulting in reduced airplane fire protection in the event of a leak in the engine fuel line or a fire in the engine nacelle.
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Required Actions
Inspect engine fuel shutoff valves (spar valves) to detect fuel leakage and ensure no leakage occurs when valves are commanded to close. Perform an alignment procedure of the engine fuel shutoff valves if necessary. Actions must be accomplished as specified in Boeing Alert Service Bulletin 757-28A0045, Revision 1.
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Compliance Time
Required as indicated, unless accomplished previously.
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Affected Aircraft
Boeing Model 757 series airplanes listed in Boeing Alert Service Bulletin 757-28A0045, Revision 1, dated November 19, 1998, including those with line positions 478 through 699 inclusive.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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