AD 2017-14-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | CFM | International S | Airworthiness Directives; CFM International S.A. Turbofan Engines |
Unsafe Condition
Corrosion in the variable stator vane (VSV) bores of the high-pressure compressor (HPC) stator case may lead to restricted VSV movement, potentially preventing the actuator from fully reaching the commanded position.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Initial and repetitive checks of the VSV actuation system in the HPC must be performed. If any stage requires more than 100 lbs. force to move the actuation ring, ream the VSV bores and apply anti-corrosion coating to stages 1, 2, and 3. Alternatively, install a replacement HPC stator case that passes the VSV pull force check with measurements of 75 lbs. or less.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 50 flight hours after the effective date of the AD.
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Affected Aircraft
CFM International S.A. CFM56-3, -3B, and -3C turbofan engines with steel HPC stator cases, part numbers 1499M30G01, 1499M30G02, 1499M30G03, or 1676M88G01, 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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