# Proposed AD FAA-2007-27496: Bell Helicopter Textron, Inc. Model 205A, 205A-1, 205B, 212, 412, 412CF, and 412EP Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2007-22-02
- Products: Bell Helicopter Textron
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: March 13, 2007, 72 FR 11295
- Comments due: May 14, 2007
- Became: [AD 2007-22-02](https://openairdocs.org/ad/2007-22-02)
- Docket: FAA-2007-27496 (https://www.regulations.gov/docket/FAA-2007-27496, where comments are filed)
- Project: 2005-SW-37-AD
- FR document: E7-4525
- Official PDF: https://openairdocs.org/files/sha256/54/c2/54c2cf32a661b6224828b914992b402237b889e4fdf99537eb14e5aa253aab54 (from https://www.govinfo.gov/content/pkg/FR-2007-03-13/pdf/E7-4525.pdf)
- Federal Register: https://www.federalregister.gov/documents/2007/03/13/E7-4525/airworthiness-directives-bell-helicopter-textron-inc-model-205a-205a-1-205b-212-412-412cf-and-412ep
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/8C9F8B9A26DE35DA8625729D004C41BA.0001
- Page: https://openairdocs.org/proposed/FAA-2007-27496

## Summary

This document proposes superseding an existing airworthiness directive (AD) for the specified Bell Helicopter Textron, Inc. (Bell) helicopters. That AD currently requires inspecting each affected tail rotor blade (blade) forward tip weight retention block (tip block) and the aft tip closure (tip closure) for adhesive bond voids, and removing any blade with an excessive void from service. That AD also requires modifying certain blades by installing shear pins and tip closure rivets. This action would contain the same requirements but would expand the applicability to include other part and serial-numbered blades. This AD would also clarify the requirement to re-identify the modified blade by adding "FM'' after the part number and would require dynamically balancing the tail rotor. The existing AD was prompted by five occurrences of missing tip blocks or tip closures resulting in minor to substantial damage. This proposal was prompted by the determination that the AD should apply to other affected part and serial-numbered blades. The actions specified by this proposed AD are intended to prevent loss of a tip block or tip closure, loss of a blade, and subsequent loss of control of the helicopter.

## Notices in this docket

- Mar 13, 2007: Notice of proposed rulemaking (NPRM). (first notice), FR document E7-4525, comments due May 14, 2007 (https://www.federalregister.gov/documents/2007/03/13/E7-4525/airworthiness-directives-bell-helicopter-textron-inc-model-205a-205a-1-205b-212-412-412cf-and-412ep)

---
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.