# Proposed AD FAA-2013-0019: Bell Helicopter Textron Canada Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2013-12-07
- Products: Bell Helicopter Textron Canada
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: February 1, 2013, 78 FR 7308
- Comments due: April 2, 2013
- Became: [AD 2013-12-07](https://openairdocs.org/ad/2013-12-07)
- Docket: FAA-2013-0019 (https://www.regulations.gov/docket/FAA-2013-0019, where comments are filed)
- Project: 2010-SW-051-AD
- FR document: 2013-02253
- Official PDF: https://openairdocs.org/files/sha256/ac/43/ac43a25dd4a1999e4a6fdebc94b95d3ce8dac502e33d134113e9592e1134be20 (from https://www.govinfo.gov/content/pkg/FR-2013-02-01/pdf/2013-02253.pdf)
- Federal Register: https://www.federalregister.gov/documents/2013/02/01/2013-02253/airworthiness-directives-bell-helicopter-textron-canada-helicopters
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/EE02964B153609AB86257B050051C2D2.0001
- Page: https://openairdocs.org/proposed/FAA-2013-0019

## Summary

We propose to adopt a new airworthiness directive (AD) for Bell Helicopter Textron Canada (BHTC) Model 407 helicopters with certain tailboom assemblies installed. This proposed AD would require, at specified intervals, inspecting the tailboom assembly for a crack, loose rivet, or other damage. This proposed AD is prompted by a stress analysis of the tailboom skin that revealed high-stress-concentration areas are susceptible to skin cracking. This condition, if not detected, could result in a crack in the tailboom assembly, failure of the tailboom, and subsequent loss of control of the helicopter.

## Notices in this docket

- Feb 1, 2013: Notice of proposed rulemaking (NPRM). (first notice), FR document 2013-02253, comments due Apr 2, 2013 (https://www.federalregister.gov/documents/2013/02/01/2013-02253/airworthiness-directives-bell-helicopter-textron-canada-helicopters)

---
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.