AD 2018-20-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | CFM | International S | Airworthiness Directives; CFM International S.A. Turbofan Engines |
Unsafe Condition
The unapproved welds on high-pressure turbine (HPT) cases installed on CFM LEAP-1B turbofan engines reduced the material capability of these cases, which requires their removal prior to reaching their published Airworthiness Limitation Section life limit. This condition, if not addressed, could result in failure of the HPT case, engine fire, and damage to the airplane.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove affected HPT cases from service and replace with a part eligible for installation.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 200 cycles after the effective date of this AD
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Affected Aircraft
CFM International S.A. LEAP-1B21, LEAP-1B23, LEAP-1B25, LEAP-1B27, LEAP-1B28, LEAP-1B28B1, LEAP-1B28B2, LEAP-1B28B2C, LEAP-1B28B3, LEAP-1B28BBJ1, and LEAP-1B28BBJ2 turbofan engines with a certain high-pressure turbine (HPT) stator case (HPT cases) installed.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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