AD Amdt-39-10761
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | CFM | International CFM56-7B and -7B/2 Series | Airworthiness Directives; CFM International CFM56-7B and -7B/2 Series Turbofan Engines |
Unsafe Condition
Failure of the HMU overspeed governor (OSG) spool valve shaft can lead to engine flameout.
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Required Actions
Inspect certain HMU OSG spool valves for out-of-specification conditions, heavy contact, or galling. Perform repetitive inspections. Optionally install an improved HMU to terminate inspections.
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Compliance Time
Before further flight
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Affected Aircraft
CFM International CFM56-7B and -7B/2 series turbofan engines
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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