AD 88-14-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Honeywell International Inc. | LTS101-600A | TEXTRON LYCOMING Model LTS101 Engines |
| engine | Honeywell International Inc. | LTS101-600A-1 | TEXTRON LYCOMING Model LTS101 Engines |
| engine | Honeywell International Inc. | LTS101-600A-2 | TEXTRON LYCOMING Model LTS101 Engines |
| engine | Honeywell International Inc. | LTS101-600A-3 | TEXTRON LYCOMING Model LTS101 Engines |
| engine | Honeywell International Inc. | LTS101-600B | TEXTRON LYCOMING Model LTS101 Engines |
| engine | Honeywell International Inc. | LTS101-600B-3 | TEXTRON LYCOMING Model LTS101 Engines |
| engine | Honeywell International Inc. | LTS101-650A | TEXTRON LYCOMING Model LTS101 Engines |
| engine | Honeywell International Inc. | LTS101-650A-1 | TEXTRON LYCOMING Model LTS101 Engines |
| engine | Honeywell International Inc. | LTS101-650A-2 | TEXTRON LYCOMING Model LTS101 Engines |
| engine | Honeywell International Inc. | LTS101-650B-1 | TEXTRON LYCOMING Model LTS101 Engines |
Unsafe Condition
Failure of the Number 3 or Number 4 bearings could result in an uncontained failure of the power turbine (PT) disk.
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Required Actions
Visually inspect chip detectors and determine debris category per SB LT 101-77-30-0104 when debris monitor lights illuminate. Check RBSH and full flow scavenge debris monitor continuity daily. Check engine oil pump output pressure within 50 hours in service after specific priority letters or December 23, 1987, adjusting pressure to specified ranges (80-100 or 90-100 psig). Inspect RBSH scavenge debris monitors every 50 hours in service. Conduct clogging inspections and disassemble RBSH if limits are exceeded.
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Compliance Time
within 50 hours in service after December 23, 1987, or after receipt of specific priority letters
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Affected Aircraft
Textron Lycoming LTS101 series turboshaft engines including models LTS101-600A, LTS101-600A-1, LTS101-600A-2, LTS101-600A-3, LTS101-600B, LTS101-600B-3, LTS101-650B-1, LTS101-650C-2, LTS101-650C-3, LTS101-750B-1, LTS101-750B-2, LTS101-750C-1, and others as listed in the AD.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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