# Proposed AD FAA-2015-4007: Various Model 234 and Model CH-47D Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2018-16-11
- Products: Various Model 234 and Model CH-47D Helicopters
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: March 14, 2017, 82 FR 13567
- Comments due: May 15, 2017
- Became: [AD 2018-16-11](https://openairdocs.org/ad/2018-16-11)
- Docket: FAA-2015-4007 (https://www.regulations.gov/docket/FAA-2015-4007, where comments are filed)
- Project: 2015-SW-064-AD
- FR document: 2017-04735
- Official PDF: https://openairdocs.org/files/sha256/c5/4a/c54af5e2ff8695aeff1f411e20c3c76ba6d89a303df3de6873d59ea2a476f8ed (from https://www.govinfo.gov/content/pkg/FR-2017-03-14/pdf/2017-04735.pdf)
- Federal Register: https://www.federalregister.gov/documents/2017/03/14/2017-04735/airworthiness-directives-various-model-234-and-model-ch-47d-helicopters
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/D8B4A5ED4E2AF598862580E300592205.0001
- Page: https://openairdocs.org/proposed/FAA-2015-4007

## Summary

We propose to adopt a new airworthiness directive (AD) for various Model 234 and Model CH-47D helicopters. This proposed AD would require inspections of the pitch housing and revising the pitch housing retirement life. This proposed AD is prompted by reports of cracking in the pitch housing lugs. The proposed actions are intended to detect and prevent an unsafe condition on these products.

## Notices in this docket

- Mar 14, 2017: Notice of proposed rulemaking (NPRM). (first notice), FR document 2017-04735, comments due May 15, 2017 (https://www.federalregister.gov/documents/2017/03/14/2017-04735/airworthiness-directives-various-model-234-and-model-ch-47d-helicopters)

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