# Proposed AD FAA-2009-0399: Bombardier Model CL-600-2C10 (Regional Jet Series 700, 701 & 702), CL-600-2D15 (Regional Jet Series 705), and CL-600-2D24 (Regional Jet Series 900) Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2009-22-09
- Products: Bombardier
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 30, 2009, 74 FR 19902
- Comments due: June 1, 2009
- Became: [AD 2009-22-09](https://openairdocs.org/ad/2009-22-09)
- Docket: FAA-2009-0399 (https://www.regulations.gov/docket/FAA-2009-0399, where comments are filed)
- Project: 2008-NM-226-AD
- FR document: E9-9866
- Official PDF: https://openairdocs.org/files/sha256/74/8a/748a9dbda1166a963d995a3000f21cf948c0fb7d404ca4c03014fc29960ca7f7 (from https://www.govinfo.gov/content/pkg/FR-2009-04-30/pdf/E9-9866.pdf)
- Federal Register: https://www.federalregister.gov/documents/2009/04/30/E9-9866/airworthiness-directives-bombardier-model-cl-600-2c10-regional-jet-series-700-701-and-702
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FEBB464A62874CD5862575A80052AF4B.0001
- Page: https://openairdocs.org/proposed/FAA-2009-0399

## Summary

We propose to adopt a new airworthiness directive (AD) for the products listed above. 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:

A change in dimensions of the fuse blocks in the Auxiliary Power Unit (APU) Start Contactor Assembly (ASCA) box assembly can cause an incorrect interface between the bus bars and fuses. This condition can result in an increase in temperature, which could damage the ASCA box and/or compromise the availability of battery bus supply.

The unsafe condition could result in the ignition of a fire in the ASCA box. The proposed AD would require actions that are intended to address the unsafe condition described in the MCAI.

## Notices in this docket

- Apr 30, 2009: Notice of proposed rulemaking (NPRM). (first notice), FR document E9-9866, comments due Jun 1, 2009 (https://www.federalregister.gov/documents/2009/04/30/E9-9866/airworthiness-directives-bombardier-model-cl-600-2c10-regional-jet-series-700-701-and-702)

---
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.