AD 2011-23-13
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Honeywell | International Inc | Airworthiness Directives; Honeywell International Inc. Turboshaft Engines |
Unsafe Condition
Power turbine governor (PTG) spool bearings, part number 2523973 Revision N and P/N 2523973 Revision P, could fail prematurely, leading to sudden engine power loss and emergency autorotation landing.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace affected PTGs model AL-AB1 with specific part numbers marked with compliance symbol N or P, or with no compliance symbol, according to specified intervals based on operating hours. Initial replacements are required within 50 or 200 operating hours, followed by repetitive replacements every 200 or 900 operating hours, depending on the compliance symbol.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within specified operating hours as detailed in the AD.
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Affected Aircraft
Honeywell International Inc. LTS101-600A-2, -3, -3A, and LTS101-700D-2 turboshaft engines with PTG model AL-AB1, part numbers 4-301-289-03, 4-301-289-05, 4-301-289-09, 4-301-101-16, or 4-301-101-18, marked with compliance symbol N or P, or with no compliance symbol.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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