AD 2001-04-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | CFM | International | Airworthiness Directives; CFM International, S.A. CFM56-3, -3B, and -3C Series Turbofan Engines |
Unsafe Condition
Reports of fan disk heavy wear and cracks could result in an uncontained engine failure and damage to the aircraft.
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Required Actions
Discontinue use of certain lubricants no longer on the manufacturer's approved list. Perform a one-time fan disk dovetail wear measurement. If wear exceeds limits, conduct an ultrasonic inspection for cracks in the fan disk. Remove and replace fan disks if necessary.
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Compliance Time
Before further flight
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Affected Aircraft
CFM International, S.A. CFM56-3, -3B, and -3C series turbofan engines installed on but not limited to Boeing 737 series aircraft.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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