AD 94-12-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 747-400 Series | Airworthiness Directives; Boeing Model 747-400 Series Airplanes |
| aircraft | The Boeing Company | 747-400D Series | Airworthiness Directives; Boeing Model 747-400 Series Airplanes |
| aircraft | The Boeing Company | 747-400F Series | Airworthiness Directives; Boeing Model 747-400 Series Airplanes |
Unsafe Condition
Fuel exhaustion due to undetected fuel leakage from a cracked fuel tube within the engine nacelle, which may not be indicated by the fuel flow meter as the leak is upstream, leading to insufficient crew response without explicit AFM procedures.
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Required Actions
Revise the Non-Normal Procedures Section of the AFM to include specific procedures for detecting fuel leaks via FMC messages and taking actions such as shutting off pumps, closing crossfeed valves, and engine shutdown if a leak is confirmed.
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Compliance Time
Within 60 days after the effective date of this AD
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Affected Aircraft
All Boeing Model 747-400 series airplanes, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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