# Proposed AD FAA-2017-0020: Honeywell International Inc. Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2018-04-13
- Products: Honeywell International
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: August 2, 2017, 82 FR 35914
- Comments due: September 18, 2017
- Became: [AD 2018-04-13](https://openairdocs.org/ad/2018-04-13)
- Docket: FAA-2017-0020 (https://www.regulations.gov/docket/FAA-2017-0020, where comments are filed)
- Project: 2016-NE-33-AD
- FR document: 2017-16148
- Official PDF: https://openairdocs.org/files/sha256/38/78/3878050b0201595dd84b9df0ac218dd6d39bc9da693ce8a355645fa06616a60f (from https://www.govinfo.gov/content/pkg/FR-2017-08-02/pdf/2017-16148.pdf)
- Federal Register: https://www.federalregister.gov/documents/2017/08/02/2017-16148/airworthiness-directives-honeywell-international-inc-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/E607EDCAAC5E960F8625817000532CAC.0001
- Page: https://openairdocs.org/proposed/FAA-2017-0020

## Summary

We propose to adopt a new airworthiness directive (AD) for certain Honeywell International Inc. AS907 series turbofan engines. This proposed AD was prompted by two loss-of-thrust-control events, and two in-flight shutdowns (IFSDs) of new production, low-time engines attributed to water intrusion of the engine electronic control unit (ECU). This proposed AD would require applying sealant to identified areas of the ECU and requires inserting a copy of certain airplane operating procedures into the applicable flight manuals. We are proposing this AD to correct the unsafe condition on these products.

## Notices in this docket

- Aug 2, 2017: Notice of proposed rulemaking (NPRM). (first notice), FR document 2017-16148, comments due Sep 18, 2017 (https://www.federalregister.gov/documents/2017/08/02/2017-16148/airworthiness-directives-honeywell-international-inc-turbofan-engines)

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