AD 93-05-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Honeywell International Inc. | TPE331-1 | ALLIED-SIGNAL INC., GARRETT ENGINE DIVISION Model TPE331-1, -2, -2UA, -3U, -3UW, -5, -5A, -5AB, -5B, -6, and -6A, and TSE331-3U Engines |
| engine | Honeywell International Inc. | TPE331-2 | ALLIED-SIGNAL INC., GARRETT ENGINE DIVISION Model TPE331-1, -2, -2UA, -3U, -3UW, -5, -5A, -5AB, -5B, -6, and -6A, and TSE331-3U Engines |
| engine | Honeywell International Inc. | TPE331-2UA | ALLIED-SIGNAL INC., GARRETT ENGINE DIVISION Model TPE331-1, -2, -2UA, -3U, -3UW, -5, -5A, -5AB, -5B, -6, and -6A, and TSE331-3U Engines |
| engine | Honeywell International Inc. | TPE331-3U | ALLIED-SIGNAL INC., GARRETT ENGINE DIVISION Model TPE331-1, -2, -2UA, -3U, -3UW, -5, -5A, -5AB, -5B, -6, and -6A, and TSE331-3U Engines |
| engine | Honeywell International Inc. | TPE331-3UW | ALLIED-SIGNAL INC., GARRETT ENGINE DIVISION Model TPE331-1, -2, -2UA, -3U, -3UW, -5, -5A, -5AB, -5B, -6, and -6A, and TSE331-3U Engines |
| engine | Honeywell International Inc. | TPE331-5 | ALLIED-SIGNAL INC., GARRETT ENGINE DIVISION Model TPE331-1, -2, -2UA, -3U, -3UW, -5, -5A, -5AB, -5B, -6, and -6A, and TSE331-3U Engines |
| engine | Honeywell International Inc. | TPE331-5A | ALLIED-SIGNAL INC., GARRETT ENGINE DIVISION Model TPE331-1, -2, -2UA, -3U, -3UW, -5, -5A, -5AB, -5B, -6, and -6A, and TSE331-3U Engines |
| engine | Honeywell International Inc. | TPE331-5AB | ALLIED-SIGNAL INC., GARRETT ENGINE DIVISION Model TPE331-1, -2, -2UA, -3U, -3UW, -5, -5A, -5AB, -5B, -6, and -6A, and TSE331-3U Engines |
| engine | Honeywell International Inc. | TPE331-5B | ALLIED-SIGNAL INC., GARRETT ENGINE DIVISION Model TPE331-1, -2, -2UA, -3U, -3UW, -5, -5A, -5AB, -5B, -6, and -6A, and TSE331-3U Engines |
| engine | Honeywell International Inc. | TPE331-6 | ALLIED-SIGNAL INC., GARRETT ENGINE DIVISION Model TPE331-1, -2, -2UA, -3U, -3UW, -5, -5A, -5AB, -5B, -6, and -6A, and TSE331-3U Engines |
Unsafe Condition
Failure of the third stage turbine wheel due to insufficient cycles in service (CIS) limits on third stage turbine stator assemblies Part Number 868379-1, -3, or -5.
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Required Actions
Replace third stage turbine stator assemblies with new or reworked assemblies according to specified cycles in service (CIS) schedules. Perform a one-time X-ray inspection for weld penetration as required. Remark assemblies P/N 868379-1 to P/N 868379-3 during replacement.
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Compliance Time
Required as indicated, unless accomplished previously.
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Affected Aircraft
Allied-Signal Inc., Garrett Engine Division Model TPE331-1, -2, -2UA, -3U, -3UW, -5, -5A, -5AB, -5B, -6, -6A turboprop and TSE331-3U turboshaft engines with third stage turbine stator assemblies P/N 868379-1, -3, or -5.
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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