# Proposed AD FAA-2009-1185: Honeywell International LTS101 Series Turboshaft Engines and LTP101 Series Turboprop Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2011-08-06
- Products: Honeywell International
- Product type: Engine
- Action: Supplemental notice of proposed rulemaking (NPRM); reopening of comment period.
- Published: December 17, 2010, 75 FR 78937
- Comments due: February 15, 2011
- Became: [AD 2011-08-06](https://openairdocs.org/ad/2011-08-06)
- Docket: FAA-2009-1185 (https://www.regulations.gov/docket/FAA-2009-1185, where comments are filed)
- Project: 2009-NE-24-AD
- FR document: 2010-31782
- Official PDF: https://openairdocs.org/files/sha256/8e/65/8e6514eb4fdf2702a190fa37717b82e905d70dfd3892ebe4397aea19cdcbb217 (from https://www.govinfo.gov/content/pkg/FR-2010-12-17/pdf/2010-31782.pdf)
- Federal Register: https://www.federalregister.gov/documents/2010/12/17/2010-31782/airworthiness-directives-honeywell-international-lts101-series-turboshaft-engines-and-ltp101-series
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/0D16CEE352C5426E862577FC0050A030.0001
- Page: https://openairdocs.org/proposed/FAA-2009-1185

## Summary

This supplemental NPRM revises an earlier proposed airworthiness directive (AD), for Honeywell International LTS101-600A series and LTS101-700D-2 turboshaft engines, and LTP101-600A-1A and LTP101-700A-1A turboprop engines with power turbine blades, part number (P/N) 4-141-084-06, installed. That proposed AD would have required removing power turbine blades, P/N 4-141-084-06 from service, using a drawdown schedule specified in that proposed AD. That proposal was prompted by reports of fatigue cracks in the airfoil of the power turbine blade. This action revises the proposed rule by expanding and clarifying the applicability to include more engine models and power turbine blade P/Ns that could have the unsafe condition, and by clarifying the applicability by specifying power turbine rotor P/Ns instead of the blade P/Ns. The actions specified by this proposed AD are intended to prevent fracture of the power turbine blade airfoil, which could result in sudden loss of engine powerand prevent continued safe flight or safe landing.

## Notices in this docket

- Dec 21, 2009: Notice of proposed rulemaking (NPRM). (first notice), FR document E9-30220, comments due Feb 19, 2010 (https://www.federalregister.gov/documents/2009/12/21/E9-30220/airworthiness-directives-honeywell-international-lts101-600a-series-and-lts101-700d-2-turboshaft)
- Dec 17, 2010: Supplemental notice of proposed rulemaking (NPRM); reopening of comment period., FR document 2010-31782, comments due Feb 15, 2011 (https://www.federalregister.gov/documents/2010/12/17/2010-31782/airworthiness-directives-honeywell-international-lts101-series-turboshaft-engines-and-ltp101-series)

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