AD 2001-12-20
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | General | Electric Company (GE) CF6-50 Turbofan | Airworthiness Directives; General Electric Company (GE) CF6-50 Turbofan Engines |
Unsafe Condition
Reports of an uncontained low pressure turbine (LPT) disk failure that resulted from an air duct failure causing fan mid shaft (FMS) separation. This could lead to HPC air duct failures resulting in FMS failures, rejected takeoffs, or uncontained LPT events, and HPC rear shaft failures causing uncontained engine failures.
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Required Actions
Remove old high pressure compressor (HPC) air ducts and mating hardware, and replace with newly designed air ducts and reworked mating hardware. Inspect certain reworked mating hardware repetitively. Rework and reidentify existing rear shafts to be used with the new air duct design.
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Compliance Time
Before further flight
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Affected Aircraft
General Electric Company (GE) CF6-50 turbofan engines, as specified in the referenced service bulletins.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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