AD 2009-05-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 777-200 and -300 | Airworthiness Directives; Boeing Model 777-200 and -300 Series Airplanes Equipped With Rolls-Royce Model RB211-TRENT 800 Series Engines |
| engine | Rolls-Royce | RB211-TRENT 800 Series | Airworthiness Directives; Boeing Model 777-200 and -300 Series Airplanes Equipped With Rolls-Royce Model RB211-TRENT 800 Series Engines |
Unsafe Condition
Ice accumulating in the main tank fuel feed system, which, when released, could result in a restriction in the engine fuel system. Such a restriction could result in failure to achieve a commanded thrust, and consequent forced landing of the airplane.
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Required Actions
Revise the AFM in-flight procedures by reducing the step climb from 3 to 2 hours prior to descent, and require flightcrews to retard the throttles to minimum idle for 30 seconds at the top of descent to ensure any ice accumulation on the face of the FOHE melts while the airplane is at higher altitudes. Retain the fuel circulation procedures to be accomplished by a certified mechanic.
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Compliance Time
Before further flight
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Affected Aircraft
Boeing Model 777-200 and -300 series airplanes equipped with Rolls-Royce Model RB211-TRENT 800 series engines.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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