AD 84-20-51
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Honeywell International Inc. | ATF3-6 | GARRETT TURBINE ENGINE COMPANY (GTEC) (formerly AiResearch Manufacturing Company of Arizona) Models ATF3-6-4C, -6A-3C, and -6A- 4C Engines |
| engine | Honeywell International Inc. | ATF3-6A | GARRETT TURBINE ENGINE COMPANY (GTEC) (formerly AiResearch Manufacturing Company of Arizona) Models ATF3-6-4C, -6A-3C, and -6A- 4C Engines |
Unsafe Condition
The possibility of an uncontained engine failure due to seal/rotor contact and/or seal looseness in the stationary seal/sixth stage low pressure turbine rotor assembly area.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the stationary seal/sixth stage low pressure turbine rotor assembly area for evidence of seal/rotor contact and/or seal looseness using specified maintenance manuals. Disassemble engines with unsuccessful inspection results to modify the exhaust deflector liner and seal assembly and inspect the sixth stage turbine rotor assembly. Incorporate the exhaust deflector liner and seal assembly bolted flange system within 200 operating hours after the effective date or prior to April 15, 1985.
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Compliance Time
Prior to the accumulation of an additional 5 hours in service after the effective date of this AD, and at intervals not to exceed 25 operational hours thereafter, until incorporation of the exhaust deflector liner and seal assembly bolted flange system.
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Affected Aircraft
GARRETT TURBINE ENGINE COMPANY (GTEC) models ATF3-6-4C, -6A-3C, and -6A-4C engines with exhaust deflector liner and seal assembly, Garrett part number 3001313-11 through -14 installed.
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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