# Proposed AD FAA-2011-0789: Honeywell International Inc. TPE331-10 and TPE331-11 Series Turboprop Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2012-02-06
- Products: Honeywell International
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: August 9, 2011, 76 FR 48749
- Comments due: September 23, 2011
- Became: [AD 2012-02-06](https://openairdocs.org/ad/2012-02-06)
- Docket: FAA-2011-0789 (https://www.regulations.gov/docket/FAA-2011-0789, where comments are filed)
- Project: 2011-NE-04-AD
- FR document: 2011-20170
- Official PDF: https://openairdocs.org/files/sha256/57/1d/571d1280e2dbe55e24a156cdf0275317accca06e49ee73e020221e2c795af267 (from https://www.govinfo.gov/content/pkg/FR-2011-08-09/pdf/2011-20170.pdf)
- Federal Register: https://www.federalregister.gov/documents/2011/08/09/2011-20170/airworthiness-directives-honeywell-international-inc-tpe331-10-and-tpe331-11-series-turboprop
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/50107A86F59504A1862578E70045AF0D.0001
- Page: https://openairdocs.org/proposed/FAA-2011-0789

## Summary

We propose to adopt a new airworthiness directive (AD) for the products listed above. This proposed AD would require inspecting certain serial number (S/N) first stage turbine disks, part number (P/ N) 3101520-1 and P/N 3107079-1. This proposed AD was prompted by a report of an uncontained failure of a first stage turbine disk that had a metallurgical defect. We are proposing this AD to prevent uncontained failure of the first stage turbine disk and damage to the airplane.

## Notices in this docket

- Aug 9, 2011: Notice of proposed rulemaking (NPRM). (first notice), FR document 2011-20170, comments due Sep 23, 2011 (https://www.federalregister.gov/documents/2011/08/09/2011-20170/airworthiness-directives-honeywell-international-inc-tpe331-10-and-tpe331-11-series-turboprop)

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