AD 92-26-08
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, -6, -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, -6, -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, -6, -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, -6, -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, -6, -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, -6, -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, -6, -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, -6, -6A and TSE331-3U Engines |
| engine | Honeywell International Inc. | TPE331-6A | ALLIED-SIGNAL INC., GARRETT ENGINE DIVISION Model TPE331-1, -2, -2UA, -3U, -3UW, -5, -5A, -6, -6A and TSE331-3U Engines |
| engine | Honeywell International Inc. | TSE331-3U | ALLIED-SIGNAL INC., GARRETT ENGINE DIVISION Model TPE331-1, -2, -2UA, -3U, -3UW, -5, -5A, -6, -6A and TSE331-3U Engines |
Unsafe Condition
Cracking of third stage stator assemblies, which could lead to an uncontained failure of the third stage turbine wheel.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace affected third stage stator assemblies (P/N 868379-3) with serviceable assemblies based on cycles in service since repair by National Flight Services. Calculate cycles by multiplying hours time in service by 1.5 if cycles cannot be determined. Alternative methods of compliance may be approved by the Los Angeles Aircraft Certification Office.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 50 cycles in service after the effective date for 900+ cycles; within 150 cycles but not exceeding 950 cycles for 450-899 cycles; prior to accumulating 600 cycles for less than 450 cycles.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Allied-Signal Inc., Garrett Engine Division Model TPE331-1, -2, -2UA, -3U, -3UW, -5, -5A, -6, -6A and TSE331-3U engines with third stage stator assemblies (P/N 868379-3) repaired at National Flight Services between February 20, 1990, and April 6, 1992, and identified by serial numbers in NF331-A72-11921.
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
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.