AD 2015-04-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | CFM | International S | Airworthiness Directives; CFM International S.A. Turbofan Engines |
Unsafe Condition
Dual engine thrust instability event resulting in overspeed and in-flight shutdown (IFSD) of one engine, caused by water-borne contamination of fuel affecting the fuel metering valve (FMV) in the hydro-mechanical unit (HMU).
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Required Actions
Remove FADEC software version 7.B.V4 or earlier installed in the electronic engine controls (EECs) on CFM56-7B engines. Prohibit operation of aircraft configured with one engine having FADEC software version 7.B.V4 or earlier and the other engine having an eligible FADEC software version.
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Compliance Time
Before further flight
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Affected Aircraft
CFM International S.A. CFM56-7B 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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