AD 91-12-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | General Electric Company | CF6-6D | GENERAL ELECTRIC COMPANY Model CF6-6 Series Engines |
| engine | General Electric Company | CF6-6D1 | GENERAL ELECTRIC COMPANY Model CF6-6 Series Engines |
| engine | General Electric Company | CF6-6D1A | GENERAL ELECTRIC COMPANY Model CF6-6 Series Engines |
| engine | General Electric Company | CF6-6K | GENERAL ELECTRIC COMPANY Model CF6-6 Series Engines |
| engine | General Electric Company | CF6-6K2 | GENERAL ELECTRIC COMPANY Model CF6-6 Series Engines |
Unsafe Condition
Failure of the stage 1 fan disk bore forward corner could result in an uncontained engine failure and damage to the aircraft.
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Required Actions
Eddy current inspect the bore forward corner of stage 1 fan disks per GE SB 72-947 Rev 4, remove and replace disks not meeting acceptance criteria, and remove disks at next shop visit or by June 30, 1992, whichever comes first.
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Compliance Time
Within the next 100 cycles in service (CIS) after the effective date of this AD or prior to specified CIS thresholds since previous inspections, whichever comes later; subsequent inspections at intervals not exceeding 500 CIS since last inspection.
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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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