AD 2013-02-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | CFM | International | Airworthiness Directives; CFM International, S.A. Turbofan Engines Modified by Supplemental Type Certificate SE00034EN |
Unsafe Condition
Forging process error during manufacture of high-pressure turbine (HPT) disks, part number 880026, serial numbers GLKBAA9307, GLKBAA9335, GLKBAA9404, GLKBAA9407, and GLKBAA9409, resulted in below allowable creep properties, reducing the calculated maximum life limits.
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Required Actions
Remove the affected HPT disks from service at reduced maximum life limits based on cycles-since-new (CSN) as specified for different engine models and thrust ratings. Use the formula in Pratt & Whitney Special Instruction 6F-12 for disks used in multiple models or thrust installations.
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Compliance Time
Within the specified CSN limits for each engine model and thrust rating.
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Affected Aircraft
CFM International, S.A. CFM56-3, CFM56-3B, and CFM56-3C turbofan engines modified by Supplemental Type Certificate SE00034EN, with HPT disk part number 880026 and specified serial numbers.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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