# Proposed AD FAA-2009-0331: Honeywell International Inc. TFE731 Series Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2010-06-11
- Products: Honeywell International
- Product type: Engine
- Action: Supplemental notice of proposed rulemaking (NPRM); reopening of comment period.
- Published: December 11, 2009, 74 FR 65697
- Comments due: January 25, 2010
- Became: [AD 2010-06-11](https://openairdocs.org/ad/2010-06-11)
- Docket: FAA-2009-0331 (https://www.regulations.gov/docket/FAA-2009-0331, where comments are filed)
- Project: 2008-NE-40-AD
- FR document: E9-29482
- Official PDF: https://openairdocs.org/files/sha256/30/9f/309fa04080e80597a19f0ef4e7970a905d258080c709be79d151b5e558109609 (from https://www.govinfo.gov/content/pkg/FR-2009-12-11/pdf/E9-29482.pdf)
- Federal Register: https://www.federalregister.gov/documents/2009/12/11/E9-29482/airworthiness-directives-honeywell-international-inc-tfe731-series-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/C2742E412331F91986257689004F9529.0001
- Page: https://openairdocs.org/proposed/FAA-2009-0331

## Summary

This supplemental NPRM revises an earlier proposed airworthiness directive (AD), for Honeywell International Inc. TFE731 series turbofan engines with certain second stage low-pressure compressor rotor (LPCR) discs and/or certain third stage LPCR discs installed. That proposed AD would have required removing from service certain second stage LPCR discs and/or certain third stage LPCR discs. That proposed AD resulted from a report of cracks found during a fluorescent penetrant inspection (FPI) of the disc bore. This supplemental NPRM revises the proposed AD to correct a P/N error, to clarify the applicability, and to clarify the instructions in the compliance section. This supplemental proposed AD results from a report of cracks found during an FPI of the disc bore. We are proposing this supplemental proposed AD to prevent an uncontained failure of a second stage LPCR disc and or a third stage LPCR disc due to cracks in the bore, which could result in damage to the airplane.

## Notices in this docket

- Apr 13, 2009: Notice of proposed rulemaking (NPRM). (first notice), FR document E9-8309, comments due Jun 12, 2009 (https://www.federalregister.gov/documents/2009/04/13/E9-8309/airworthiness-directives-honeywell-international-inc-tfe731-series-turbofan-engines)
- Dec 11, 2009: Supplemental notice of proposed rulemaking (NPRM); reopening of comment period., FR document E9-29482, comments due Jan 25, 2010 (https://www.federalregister.gov/documents/2009/12/11/E9-29482/airworthiness-directives-honeywell-international-inc-tfe731-series-turbofan-engines)

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