# Proposed AD FAA-2021-0377: Bell Textron Canada Limited Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2021-16-12
- Products: Bell Textron Canada
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: May 25, 2021, 86 FR 28038
- Comments due: July 9, 2021
- Became: [AD 2021-16-12](https://openairdocs.org/ad/2021-16-12)
- Docket: FAA-2021-0377 (https://www.regulations.gov/docket/FAA-2021-0377, where comments are filed)
- Project: MCAI-2021-00380-R
- FR document: 2021-10909
- Official PDF: https://openairdocs.org/files/sha256/d7/ad/d7ada5aa73b26f12210e709a92a2575d547d0315c1f77a6f83cae21920c6c204 (from https://www.govinfo.gov/content/pkg/FR-2021-05-25/pdf/2021-10909.pdf)
- Federal Register: https://www.federalregister.gov/documents/2021/05/25/2021-10909/airworthiness-directives-bell-textron-canada-limited-helicopters
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/3A2AEAFF796F47BE862586E00075E377.0001
- Page: https://openairdocs.org/proposed/FAA-2021-0377

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain Bell Textron Canada Limited Model 505 helicopters. This proposed AD was prompted by three occurrences of metallic debris in the engine oil lubrication system causing the 12 volts direct current (VDC) reference voltage to be shorted to ground and loss of important flight information to the pilot. This proposed AD would require replacing a certain part-numbered relay panel assembly. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- May 25, 2021: Notice of proposed rulemaking (NPRM). (first notice), FR document 2021-10909, comments due Jul 9, 2021 (https://www.federalregister.gov/documents/2021/05/25/2021-10909/airworthiness-directives-bell-textron-canada-limited-helicopters)

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