AD 91-02-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | CFM International, S.A. | CFM56-3 | CFM INTERNATIONAL Models CFM56-3, -3B, -3C Series Engines |
| engine | CFM International, S.A. | CFM56-3B | CFM INTERNATIONAL Models CFM56-3, -3B, -3C Series Engines |
| engine | CFM International, S.A. | CFM56-3C | CFM INTERNATIONAL Models CFM56-3, -3B, -3C Series Engines |
Unsafe Condition
Engine power loss or flameout while operating in heavy precipitation.
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Required Actions
Install fan splitter fairing, fan stage 1 vane assembly, and new centering shroud per SB 72-450, Revision 1. Install 12 door variable bypass valve (VBV) configuration per SB 72-462, Revision 1.
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Compliance Time
within 30 days after the effective date of this AD
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Affected Aircraft
CFM International (CFMI) CFM56-3, -3B, -3C series turbofan engines installed on Boeing 737-300, 737-400, and 737-500 aircraft.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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