AD 86-08-06 R1
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Honeywell International Inc. | TPE331-25AA | GARRETT TURBINE ENGINE COMPANY (GTEC) Model TPE331-25AA, -25AB, -25DA, -25DB, -25FA, -43A, -43BL, -47A, -55B, and -61A Engines |
| engine | Honeywell International Inc. | TPE331-25AB | GARRETT TURBINE ENGINE COMPANY (GTEC) Model TPE331-25AA, -25AB, -25DA, -25DB, -25FA, -43A, -43BL, -47A, -55B, and -61A Engines |
| engine | Honeywell International Inc. | TPE331-25DA | GARRETT TURBINE ENGINE COMPANY (GTEC) Model TPE331-25AA, -25AB, -25DA, -25DB, -25FA, -43A, -43BL, -47A, -55B, and -61A Engines |
| engine | Honeywell International Inc. | TPE331-25DB | GARRETT TURBINE ENGINE COMPANY (GTEC) Model TPE331-25AA, -25AB, -25DA, -25DB, -25FA, -43A, -43BL, -47A, -55B, and -61A Engines |
| engine | Honeywell International Inc. | TPE331-25FA | GARRETT TURBINE ENGINE COMPANY (GTEC) Model TPE331-25AA, -25AB, -25DA, -25DB, -25FA, -43A, -43BL, -47A, -55B, and -61A Engines |
| engine | Honeywell International Inc. | TPE331-43-A | GARRETT TURBINE ENGINE COMPANY (GTEC) Model TPE331-25AA, -25AB, -25DA, -25DB, -25FA, -43A, -43BL, -47A, -55B, and -61A Engines |
| engine | Honeywell International Inc. | TPE331-43-B | GARRETT TURBINE ENGINE COMPANY (GTEC) Model TPE331-25AA, -25AB, -25DA, -25DB, -25FA, -43A, -43BL, -47A, -55B, and -61A Engines |
| engine | Honeywell International Inc. | TPE331-47-A | GARRETT TURBINE ENGINE COMPANY (GTEC) Model TPE331-25AA, -25AB, -25DA, -25DB, -25FA, -43A, -43BL, -47A, -55B, and -61A Engines |
| engine | Honeywell International Inc. | TPE331-55-B | GARRETT TURBINE ENGINE COMPANY (GTEC) Model TPE331-25AA, -25AB, -25DA, -25DB, -25FA, -43A, -43BL, -47A, -55B, and -61A Engines |
| engine | Honeywell International Inc. | TPE331-61-A | GARRETT TURBINE ENGINE COMPANY (GTEC) Model TPE331-25AA, -25AB, -25DA, -25DB, -25FA, -43A, -43BL, -47A, -55B, and -61A Engines |
Unsafe Condition
Uncontained failure of the second stage turbine rotor assembly due to misassembly or warpage of the second stage turbine stator seal plate assemblies.
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Required Actions
Radiographically inspect specified second stage turbine stator seal plate assemblies per Garrett Alert Service Bulletins TPE331-A72-0522 (Rev. 2) and TPE331-A72-0560. Inspections must be done within 200 engine hours after April 18, 1986 or prior to next 500 engine hours since last overhaul, whichever is later, then every 300 engine hours. Engines must be removed from service if assemblies fail inspection standards.
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Compliance Time
Within the next 200 engine hours time in service after April 18, 1986, or prior to the next 500 engine hours time in service since the last engine overhaul, whichever comes later, and at intervals not to exceed 300 engine hours thereafter.
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Affected Aircraft
GARRETT TURBINE ENGINE COMPANY (GTEC) Model TPE331-25AA, -25AB, -25DA, -25DB, -25FA, -43A, -43BL, -47A, -55B, and -61A engines.
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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