AD 2020-21-13
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | General Electric | Company | Airworthiness Directives; General Electric Company Turbofan Engines |
Unsafe Condition
The detection of melt-related freckles in the billet, which may reduce the life limits of certain HPT rotor stage 2 disks and certain rotating CDP HPT seals.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove the affected HPT rotor stage 2 disk or rotating CDP HPT seal from service and replace it with a part eligible for installation. If the affected part has already exceeded the CSN threshold, remove it before further flight and replace with a part eligible for installation.
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Compliance Time
Within the compliance times specified, unless already done.
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Affected Aircraft
General Electric Company GE90-110B1 and GE90-115B model turbofan engines with a high-pressure turbine (HPT) rotor stage 2 disk, part number (P/N) 2505M73P03, and serial number (S/N) TMT1BA38 or TMT1BA41, installed; or a rotating compressor discharge pressure (CDP) HPT seal, P/N 2479M03P01, and S/N GEE1H7GH or GEE1H7JJ, installed.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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