AD 77-08-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | General Electric Company | CF6-50A | GENERAL ELECTRIC Models CF6-50A, CF6-50C, CF6-50C1, CF6-50D, CF6-50E, CF6-50E1, and CF6-50H Engines |
| engine | General Electric Company | CF6-50C | GENERAL ELECTRIC Models CF6-50A, CF6-50C, CF6-50C1, CF6-50D, CF6-50E, CF6-50E1, and CF6-50H Engines |
| engine | General Electric Company | CF6-50C1 | GENERAL ELECTRIC Models CF6-50A, CF6-50C, CF6-50C1, CF6-50D, CF6-50E, CF6-50E1, and CF6-50H Engines |
| engine | General Electric Company | CF6-50E | GENERAL ELECTRIC Models CF6-50A, CF6-50C, CF6-50C1, CF6-50D, CF6-50E, CF6-50E1, and CF6-50H Engines |
| engine | General Electric Company | CF6-50E1 | GENERAL ELECTRIC Models CF6-50A, CF6-50C, CF6-50C1, CF6-50D, CF6-50E, CF6-50E1, and CF6-50H Engines |
Unsafe Condition
Burn through of fuel or oil tubes located below the compressor section.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace specific fuel manifold, lube supply, and sump scavenge parts with revised part numbers as per General Electric Service Bulletin 72-447 or FAA-approved revisions.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
January 31, 1978, unless previously accomplished
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
General Electric Models CF6-50A, CF6-50C, CF6-50C1, CF6-50D, CF6-50E, CF6-50E1, and CF6-50H engines with serial numbers excluding those with steel high pressure compressor rotors/cases (specifically excluding serial numbers 517451, 517452, 517472-517475, 517502, subsequent 517 prefixed numbers, and 455907-455912, 455920, subsequent 455 prefixed numbers).
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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