AD 2001-11-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 737 | Airworthiness Directives; Boeing Model 737, 757, and 767 Series Airplanes |
Unsafe Condition
Intermittent limit-switch problems have caused motor-operated hydraulic shutoff valves to fail, potentially leading to hydraulic fluid leakage to the engine fire zone, reduced ability to retract the landing gear, loss of backup electrical power, or other combinations of failures.
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Required Actions
Inspect motor-operated hydraulic shutoff valves in sensitive applications for malfunctions through repetitive operational checks. Replace malfunctioning valves with new ones if necessary. Eventually replace certain existing valves with new, improved valves to terminate repetitive inspections.
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Compliance Time
Within 50 flight hours after the effective date of the AD.
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Affected Aircraft
Boeing Model 737, 757, and 767 series airplanes with specific motor-operated hydraulic shutoff valves in sensitive applications, as listed in the referenced service bulletins.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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