# Proposed AD FAA-2011-1223: Bombardier, Inc. Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2012-08-10
- Products: Bombardier
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: November 8, 2011, 76 FR 69155
- Comments due: December 23, 2011
- Became: [AD 2012-08-10](https://openairdocs.org/ad/2012-08-10)
- Docket: FAA-2011-1223 (https://www.regulations.gov/docket/FAA-2011-1223, where comments are filed)
- Project: 2011-NM-173-AD
- FR document: 2011-28857
- Official PDF: https://openairdocs.org/files/sha256/bd/3f/bd3ffffdbfd50bcba4bcc4108f38e62b9913ce462cdbbb18a3c35e8fd978c837 (from https://www.govinfo.gov/content/pkg/FR-2011-11-08/pdf/2011-28857.pdf)
- Federal Register: https://www.federalregister.gov/documents/2011/11/08/2011-28857/airworthiness-directives-bombardier-inc-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/17C59E6E852CD1A38625794200552ED1.0001
- Page: https://openairdocs.org/proposed/FAA-2011-1223

## Summary

We propose to adopt a new airworthiness directive (AD) for certain Bombardier, Inc. Model CL-600-2B16 (CL-601-3A, CL-601-3R, and CL-604 Variants) airplanes. 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 MCAI describes the unsafe condition as:

There have been several occurrences of the air driven generator (ADG) failure to power essential buses during functional tests of the ADG. It was found that the low threshold setting of the circuit protection on the ADG generator control unit (GCU) can prevent the supply of power from the ADG to the essential buses. In the event of an emergency, loss of power to the essential buses can prevent continued safe flight.

* * * * *

The proposed AD would require actions that are intended to address the unsafe condition described in the MCAI.

## Notices in this docket

- Nov 8, 2011: Notice of proposed rulemaking (NPRM). (first notice), FR document 2011-28857, comments due Dec 23, 2011 (https://www.federalregister.gov/documents/2011/11/08/2011-28857/airworthiness-directives-bombardier-inc-airplanes)

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