# Proposed AD FAA-2011-1228: Bombardier, Inc. Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2012-08-05
- Products: Bombardier
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: November 8, 2011, 76 FR 69166
- Comments due: December 23, 2011
- Became: [AD 2012-08-05](https://openairdocs.org/ad/2012-08-05)
- Docket: FAA-2011-1228 (https://www.regulations.gov/docket/FAA-2011-1228, where comments are filed)
- Project: 2011-NM-176-AD
- FR document: 2011-28834
- Official PDF: https://openairdocs.org/files/sha256/41/a0/41a0cea307a7cff10dca757dfc3675b537d3dc1e023780acedf6765c56da9b0c (from https://www.govinfo.gov/content/pkg/FR-2011-11-08/pdf/2011-28834.pdf)
- Federal Register: https://www.federalregister.gov/documents/2011/11/08/2011-28834/airworthiness-directives-bombardier-inc-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/1F61FF52825D6F348625794200553019.0001
- Page: https://openairdocs.org/proposed/FAA-2011-1228

## Summary

We propose to adopt a new airworthiness directive (AD) for certain Bombardier, Inc. Model CL-600-2C10 (Regional Jet Series 700, 701, & 702), CL-600-2D15 (Regional Jet Series 705), CL-600-2D24 (Regional Jet Series 900), and CL-600-2E25 (Regional Jet Series 1000) 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:

[I]t was found that the * * * ADG [air driven generator] GCU [generator control unit] transformer primary winding can break due to thermal fatigue. Broken transformer primary winding can prevent the supply of power from the ADG to the essential buses. In the event of an emergency, failure for the essential buses to remain powered can prevent continued safe flight.

* * * * *

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

## Notices in this docket

- Nov 8, 2011: Notice of proposed rulemaking (NPRM). (first notice), FR document 2011-28834, comments due Dec 23, 2011 (https://www.federalregister.gov/documents/2011/11/08/2011-28834/airworthiness-directives-bombardier-inc-airplanes)

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