AD 90-20-13
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | CFM International, S.A. | CFM56-3B | CFM INTERNATIONAL Models CFM56-3B-2 and CFM56-3C-1 Series Engines |
| engine | CFM International, S.A. | CFM56-3C | CFM INTERNATIONAL Models CFM56-3B-2 and CFM56-3C-1 Series Engines |
Unsafe Condition
Fan blade failure, inflight shutdown, and severe engine damage.
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Required Actions
Install fan blade dampers P/N 335-105-305-0, axial stops P/N 335-105-201-0, and bolts P/N J815PO56A in accordance with CFM56 Service Bulletin 72-494, Revision 2. Ferrying is allowed under FAR 21.197 and 21.199.
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Compliance Time
within 60 days from the effective date of this AD
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Affected Aircraft
CFM International models CFM56-3B-2 and CFM56-3C-1 series engines with fan blade P/Ns 9527N99P08, 9527M99P09, 9527M99P10, 9527M99P11, and 1285M39P01, installed in Boeing 737-300/400/500 series aircraft.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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