AD 98-18-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | General Electric Company | CF6-6D | GENERAL ELECTRIC COMPANY: Model (GE) CF6-6 series turbofan engines |
| engine | General Electric Company | CF6-6D1 | GENERAL ELECTRIC COMPANY: Model (GE) CF6-6 series turbofan engines |
| engine | General Electric Company | CF6-6D1A | GENERAL ELECTRIC COMPANY: Model (GE) CF6-6 series turbofan engines |
| engine | General Electric Company | CF6-6K | GENERAL ELECTRIC COMPANY: Model (GE) CF6-6 series turbofan engines |
| engine | General Electric Company | CF6-6K2 | GENERAL ELECTRIC COMPANY: Model (GE) CF6-6 series turbofan engines |
Unsafe Condition
Low pressure turbine (LPT) stage 4 disk cracking could result in an uncontained engine failure and damage to the aircraft.
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Required Actions
Remove from service LPT stage 4 disks with specified part numbers and replace with serviceable parts according to the schedule based on cycles since new (CSN) and cycles in service (CIS). Establish a new cyclic retirement life limit of 12,300 CSN for these disks.
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Compliance Time
Required as indicated, unless accomplished previously. The specific schedules are based on CSN and CIS thresholds as detailed in paragraphs (a)(1)-(3) of the AD.
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Affected Aircraft
General Electric Company CF6-6 series turbofan engines, including models CF6-6D, CF6-6D1, CF6-6D1A, CF6-6K, CF6-6K2, installed on but not limited to McDonnell Douglas DC-10-10 series aircraft.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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