AD 2020-06-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | CFM | International | Airworthiness Directives; CFM International, S.A., Turbofan Engines |
Unsafe Condition
Increased fuel flow through certain fuel nozzles due to fuel nozzle coking, potentially causing distress to the static structures of the high-pressure turbine (HPT) and in-flight shutdown (IFSD) of one or more engines; and the potential for undetected subsurface anomalies formed during the manufacturing process that could result in uncontained failure of the HPT stage 2 disk.
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Required Actions
Revising the Airworthiness Limitations Section (ALS) of the applicable CFM LEAP-1B Engine Shop Manual and the operator's approved continuous airworthiness maintenance program to: (1) Add an ultrasonic inspection of the HPT stage 2 disk to detect subsurface anomalies formed during manufacturing; (2) add an inspection of the radial drive shaft (RDS) bearing to address inadequate oil flow to the RDS bearing; (3) require monitoring and inspections of the fuel nozzle to address the potential distress to HPT static structures due to nozzle coking; and (4) update the electronic engine control (EEC) system software to address potential for icing in the pressure sensor lines.
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Compliance Time
Within 50 flight hours
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Affected Aircraft
CFM International S.A. (CFM) LEAP-1B21, -1B23, -1B25, -1B27, -1B28, -1B28B1, -1B28B2, -1B28B2C, -1B28B3, -1B28BBJ1, and -1B28BBJ2 model turbofan engines.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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