AD 91-15-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | General Electric Company | CF6-6D | GENERAL ELECTRIC COMPANY Models CF6-6 Series Engines |
| engine | General Electric Company | CF6-6D1 | GENERAL ELECTRIC COMPANY Models CF6-6 Series Engines |
| engine | General Electric Company | CF6-6D1A | GENERAL ELECTRIC COMPANY Models CF6-6 Series Engines |
| engine | General Electric Company | CF6-6K | GENERAL ELECTRIC COMPANY Models CF6-6 Series Engines |
| engine | General Electric Company | CF6-6K2 | GENERAL ELECTRIC COMPANY Models CF6-6 Series Engines |
Unsafe Condition
Failure of the stage 1 fan disk could result in an uncontained engine failure and damage to the aircraft.
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Required Actions
Remove from service and replace stage 1 fan disks with serial numbers in Group A within 10 cycles in service after the effective date. Eddy current inspect Group B disks per schedules based on prior inspections and cycles since ultrasonic inspection. Immersion ultrasonic inspect Group C disks by December 31, 1991, or next shop visit. Replace non-compliant disks before further flight.
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Compliance Time
Within the next 10 cycles in service (CIS) after the effective date of this AD (August 5, 1991) for Group A disks. Schedules for Group B and C disks are based on cycles since prior inspections and specific deadlines (e.g., 100 CIS, 2500 CIS, June 30, 1992, December 31, 1991).
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Affected Aircraft
General Electric Company CF6-6 series engines (models CF6-6D, CF6-6D1, CF6-6D1A, CF6-6K, CF6-6K2) installed on, but not limited to, McDonnell Douglas DC10-10 aircraft.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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