# Proposed AD FAA-2008-0363: Bombardier Model CL-600-2B19 (Regional Jet Series 100 & 440) Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2008-12-10
- Products: Bombardier
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: March 27, 2008, 73 FR 16221
- Comments due: April 28, 2008
- Became: [AD 2008-12-10](https://openairdocs.org/ad/2008-12-10)
- Docket: FAA-2008-0363 (https://www.regulations.gov/docket/FAA-2008-0363, where comments are filed)
- Project: 2008-NM-020-AD
- FR document: E8-6299
- Official PDF: https://openairdocs.org/files/sha256/87/5c/875cbee737a1d54c97718e8c53332739a1d101bef4732d9d8531bcc619a5039f (from https://www.govinfo.gov/content/pkg/FR-2008-03-27/pdf/E8-6299.pdf)
- Federal Register: https://www.federalregister.gov/documents/2008/03/27/E8-6299/airworthiness-directives-bombardier-model-cl-600-2b19-regional-jet-series-100-and-440-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/4BBCA14DD83FAEE68625741900510E12.0001
- Page: https://openairdocs.org/proposed/FAA-2008-0363

## 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:

* * * * * This assessment showed that the electrical harness of the Fuel Quantity Gauging System (FQGS) is installed in the same routing as the 28 Volts AC, 28 Volts DC, and 115 Volts AC electrical harnesses. A chafing condition between these electrical harnesses and the FQGS harness could increase the surface temperatures of fuel quantity probes and high level sensors inside the fuel tank, resulting in potential ignition source[s] and consequent fuel tank explosion. * * * * * The proposed AD would require actions that are intended to address the unsafe condition described in the MCAI.

## Notices in this docket

- Mar 27, 2008: Notice of proposed rulemaking (NPRM). (first notice), FR document E8-6299, comments due Apr 28, 2008 (https://www.federalregister.gov/documents/2008/03/27/E8-6299/airworthiness-directives-bombardier-model-cl-600-2b19-regional-jet-series-100-and-440-airplanes)

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