AD 2021-10-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | CFM | International | Airworthiness Directives; CFM International, S.A. Turbofan Engines |
Unsafe Condition
Pressure transducer corrosion following extended storage periods can cause erroneous pressure sensor signals to the electronic engine control, resulting in loss of engine thrust control and reduced control of the airplane.
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Required Actions
For an engine in service, this AD requires checks for engine maintenance messages related to the pressure transducer and, depending on the results of the checks, replacement of the PSS unit before further flight. This AD requires this repetitive check for faults prior to each flight until the PSS unit has accumulated at least 15 hours of electrical power. For an engine not in service, this AD requires applying electrical power to the PSS unit prior to returning the engine to service.
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Compliance Time
Before further flight
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Affected Aircraft
CFM International, S.A. LEAP-1B model turbofan engines with susceptible pressure transducers.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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