AD 94-18-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Honeywell International Inc. | LTP 101-600 | Textron Lycoming LTS101 Series Turboshaft and LTP101 Series Turboprop Engines |
| engine | Honeywell International Inc. | LTP 101-600A | Textron Lycoming LTS101 Series Turboshaft and LTP101 Series Turboprop Engines |
| engine | Honeywell International Inc. | LTP 101-600A-1A | Textron Lycoming LTS101 Series Turboshaft and LTP101 Series Turboprop Engines |
| engine | Honeywell International Inc. | LTP 101-700A-1A | Textron Lycoming LTS101 Series Turboshaft and LTP101 Series Turboprop Engines |
| engine | Honeywell International Inc. | LTS101-600A | Textron Lycoming LTS101 Series Turboshaft and LTP101 Series Turboprop Engines |
| engine | Honeywell International Inc. | LTS101-600A-1 | Textron Lycoming LTS101 Series Turboshaft and LTP101 Series Turboprop Engines |
| engine | Honeywell International Inc. | LTS101-600A-2 | Textron Lycoming LTS101 Series Turboshaft and LTP101 Series Turboprop Engines |
| engine | Honeywell International Inc. | LTS101-600A-3 | Textron Lycoming LTS101 Series Turboshaft and LTP101 Series Turboprop Engines |
| engine | Honeywell International Inc. | LTS101-600B | Textron Lycoming LTS101 Series Turboshaft and LTP101 Series Turboprop Engines |
| engine | Honeywell International Inc. | LTS101-600B-3 | Textron Lycoming LTS101 Series Turboshaft and LTP101 Series Turboprop Engines |
Unsafe Condition
No. 2 bearings with roller cages either undercut or staked improperly, increasing cage stress levels and causing high cycle fatigue fractures at the cross web area, leading to engine power loss and inflight engine shutdown.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove and replace No. 2 bearings (Part Number 4-301-362-01 with specified serial numbers) in accordance with Textron Lycoming ASB A-LT101-72-50-0163. For single-engine or twin-engine aircraft with both affected bearings, do this prior to further flight. For others, within 25 hours time in service after the AD's effective date.
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Compliance Time
prior to further flight (for single-engine or twin-engine with both affected bearings) or within 25 hours time in service after the effective date (for all other aircraft)
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Affected Aircraft
Textron Lycoming LTS101 series turboshaft and LTP101 series turboprop engines with No. 2 bearings, Part Number 4-301-362-01, serial numbers 3-740 through 3-839, 3-1288 through 3-1361, and 4-534 through 4-680. Installed on Aerospatiale AS350/SA-366, Bell 222, MBB BK117 helicopters; Airtractor AT302, Piaggio P166, Cessna 421 (STC), and Page Thrush airplanes.
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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