# Proposed AD FAA-2016-9451: Honeywell International Inc. Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2017-20-01
- Products: Honeywell International
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: March 7, 2017, 82 FR 12755
- Comments due: April 21, 2017
- Became: [AD 2017-20-01](https://openairdocs.org/ad/2017-20-01)
- Docket: FAA-2016-9451 (https://www.regulations.gov/docket/FAA-2016-9451, where comments are filed)
- Project: 2016-NE-24-AD
- FR document: 2017-04370
- Official PDF: https://openairdocs.org/files/sha256/fc/56/fc560231ecaa2f87794293ec45cac03d6e026ade678d8a23e77356a663dd6622 (from https://www.govinfo.gov/content/pkg/FR-2017-03-07/pdf/2017-04370.pdf)
- Federal Register: https://www.federalregister.gov/documents/2017/03/07/2017-04370/airworthiness-directives-honeywell-international-inc-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/9EEBF65F7CD6EEDC862580DC0057CD1D.0001
- Page: https://openairdocs.org/proposed/FAA-2016-9451

## Summary

We propose to adopt a new airworthiness directive (AD) for all Honeywell International Inc. TFE731-20 and TFE731-40 turbofan engines. This proposed AD was prompted by two fan disks found with a manufacturing-caused flaw. This proposed AD would require removing affected fan disks, performing a one-time inspection, and replacing fan disks that fail inspection. We are proposing this AD to correct the unsafe condition on these products.

## Notices in this docket

- Mar 7, 2017: Notice of proposed rulemaking (NPRM). (first notice), FR document 2017-04370, comments due Apr 21, 2017 (https://www.federalregister.gov/documents/2017/03/07/2017-04370/airworthiness-directives-honeywell-international-inc-turbofan-engines)

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