# Proposed AD FAA-2016-9450: Honeywell International Inc. Turboprop and Turboshaft Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2018-13-05
- Products: Honeywell International
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: September 13, 2017, 82 FR 42957
- Comments due: October 30, 2017
- Became: [AD 2018-13-05](https://openairdocs.org/ad/2018-13-05)
- Docket: FAA-2016-9450 (https://www.regulations.gov/docket/FAA-2016-9450, where comments are filed)
- FR document: 2017-19314
- Official PDF: https://openairdocs.org/files/sha256/a0/22/a0227550bfcbe907a93c00bbc968849633145f2c1c64e5150ba930befddbd20d (from https://www.govinfo.gov/content/pkg/FR-2017-09-13/pdf/2017-19314.pdf)
- Federal Register: https://www.federalregister.gov/documents/2017/09/13/2017-19314/airworthiness-directives-honeywell-international-inc-turboprop-and-turboshaft-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/3ABAFFBC861F95988625819A004B506B.0001
- Page: https://openairdocs.org/proposed/FAA-2016-9450

## Summary

We propose to adopt a new airworthiness directive (AD) for certain Honeywell International Inc. TPE331 turboprop and TSE331 turboshaft engines. This proposed AD was prompted by recent reports of failures of the direct drive fuel control gears and bearings in the hydraulic torque sensor gear assembly, part number (P/N) 3101726-3. This proposed AD would require initial and repetitive engine oil filter sampling and analysis of the affected engines. This proposed AD would also require inspection of hydraulic torque sensor gear assemblies that do not meet oil filter inspection requirements. This proposed AD would further require improved component overhaul procedures that would remove from service, by attrition, certain P/N hydraulic torque sensor gear assemblies. We are proposing this AD to correct the unsafe condition on these products.

## Notices in this docket

- Sep 13, 2017: Notice of proposed rulemaking (NPRM). (first notice), FR document 2017-19314, comments due Oct 30, 2017 (https://www.federalregister.gov/documents/2017/09/13/2017-19314/airworthiness-directives-honeywell-international-inc-turboprop-and-turboshaft-engines)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.