AD 88-12-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | General Electric Company | CF6-6D | GENERAL ELECTRIC Model CF6-6 Engines |
| engine | General Electric Company | CF6-6D1 | GENERAL ELECTRIC Model CF6-6 Engines |
| engine | General Electric Company | CF6-6D1A | GENERAL ELECTRIC Model CF6-6 Engines |
| engine | General Electric Company | CF6-6K | GENERAL ELECTRIC Model CF6-6 Engines |
| engine | General Electric Company | CF6-6K2 | GENERAL ELECTRIC Model CF6-6 Engines |
Unsafe Condition
Failure of high pressure compressor (HPC) rear shafts and/or compressor discharge pressure (CDP) seal supports.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove from service specified HPC rear shafts and CDP seal supports based on their accumulated cycles since new. For parts with 17,600 or more cycles on the effective date, remove within next 400 cycles. For parts with less than 17,600 cycles, remove at or before 18,000 cycles since new.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 400 cycles in service or at or prior to accumulating 18,000 cycles since new, depending on the part's accumulated cycles on the effective date.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
General Electric CF6-6 engines with model designators CF6-6D, CF6-6D1, CF6-6D1A, CF6-6K, CF6-6K2, and specific part numbers for HPC rear shafts (9021M68G02-04, 9021M68G07-09, 9021M68G12-13, 1380M55G01-06) and CDP seal supports (9686M62P02-08, 9686M62P10).
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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