AD 92-15-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Honeywell International Inc. | LTP 101-600 | TEXTRON LYCOMING Model LTS101 Series and LTP101 Series Engines |
| engine | Honeywell International Inc. | LTP 101-600A | TEXTRON LYCOMING Model LTS101 Series and LTP101 Series Engines |
| engine | Honeywell International Inc. | LTP 101-600A-1A | TEXTRON LYCOMING Model LTS101 Series and LTP101 Series Engines |
| engine | Honeywell International Inc. | LTP 101-700A-1A | TEXTRON LYCOMING Model LTS101 Series and LTP101 Series Engines |
| engine | Honeywell International Inc. | LTS101-600A | TEXTRON LYCOMING Model LTS101 Series and LTP101 Series Engines |
| engine | Honeywell International Inc. | LTS101-600A-1 | TEXTRON LYCOMING Model LTS101 Series and LTP101 Series Engines |
| engine | Honeywell International Inc. | LTS101-600A-2 | TEXTRON LYCOMING Model LTS101 Series and LTP101 Series Engines |
| engine | Honeywell International Inc. | LTS101-600A-3 | TEXTRON LYCOMING Model LTS101 Series and LTP101 Series Engines |
| engine | Honeywell International Inc. | LTS101-600B | TEXTRON LYCOMING Model LTS101 Series and LTP101 Series Engines |
| engine | Honeywell International Inc. | LTS101-600B-3 | TEXTRON LYCOMING Model LTS101 Series and LTP101 Series Engines |
Unsafe Condition
Fracture of the integrally cast power turbine (PT) rotor blade can result in engine power loss and uncontained engine failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Perform fluorescent penetrant inspections (Type I, Method C and D) on PT rotors per SB LT 101-72-00-0093, replace cracked rotors, avoid certain PT speed operations per SB LTS 101C-72-00-0131, and install cockpit decals/flight manual supplements per Bell SBs.
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Compliance Time
Within 50 hours time in service (TIS) or 300 PT cycles in service (CIS), whichever occurs first, since the last inspection under AD 87-11-09. Thereafter, reinspect at intervals not exceeding 50 hours TIS or 300 PT CIS. Compliance required within 20 hours TIS after the AD's effective date for speed avoidance measures.
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Affected Aircraft
Textron Lycoming LTS101 series turboshaft and LTP101 series turboprop engines installed on Aerospatiale AS350, Bell 222, MBB BK117 helicopters; Piaggio P166-DL3, Airtractor AT302, Cessna 421 airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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