# Proposed AD FAA-2008-0450: Bell Helicopter Textron Canada (BHTC) Model 230 Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2008-16-16
- Products: Bell Helicopter Textron Canada
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
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- Published: April 27, 2008, Federal Register: April 28, 2008
- Comments due: May 22, 2008
- Became: [AD 2008-16-16](https://openairdocs.org/ad/2008-16-16)
- Docket: FAA-2008-0450 (https://www.regulations.gov/docket/FAA-2008-0450, where comments are filed)
- Project: 2007-SW-39-AD
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/38F7DEFAF0A0EED08625743400603C5D.0001
- Page: https://openairdocs.org/proposed/FAA-2008-0450

## Summary

We propose to adopt a new airworthiness directive (AD) for BHTC Model 230 helicopters. This proposed AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The aviation authority of Canada, with which we have a bilateral agreement, states in the MCAI:

It has been determined that the existing rigging procedures for the tail rotor pitch change mechanism have to be changed due to possibility of parts interference.

The cumulative effect of individual part tolerances resulting in the total assemblage of those parts being out of tolerance could result in the tail rotor yoke striking another part other than the flapping stop (parts interference) as cited in the MCAI. Also, the misalignment of the tail rotor counterweight bellcrank may result in higher tail rotor pedal forces and a higher pilot workload after failure of the No. 1 hydraulicsystem. Both parts interference and the misaligned counterweight bellcrank create an unsafe condition. The proposed AD would require actions that are intended to address these unsafe conditions.

## Notices in this docket

- Apr 23, 2008: Notice of proposed rulemaking (NPRM). (first notice), FR document E8-8755, comments due May 23, 2008 (https://www.federalregister.gov/documents/2008/04/23/E8-8755/airworthiness-directives-bell-helicopter-textron-canada-bhtc-model-230-helicopters)
- Apr 27, 2008: Notice of proposed rulemaking (NPRM).
-----------------------------------------------------------------------, comments due May 22, 2008 (https://drs.faa.gov/browse/excelExternalWindow/38F7DEFAF0A0EED08625743400603C5D.0001)

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