# Airworthiness Directives; Bombardier Model CL-600-2B19 (Regional Jet Series 100 & 440) Airplanes
> **Rule** · Final rule; request for comments. · Published 2006-04-26 · Effective 2006-04-26 · 71 FR 24576
## Document
- **Document number:** 06-3990
- **Category:** airworthiness
- **Manufacturer:** Bombardier Model CL-600-2B19 (Regional Jet Series 100 & 440)
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 71 FR 24576
- **Publication date:** 2006-04-26
- **Effective date:** 2006-04-26
- **FAA docket:** Docket No. FAA-2006-24586
## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain Bombardier Model CL-600-2B19 (Regional Jet Series 100 & 440) airplanes. This AD requires modifying the wiring on an alternating current (AC) service bus contactor that is located in the avionics bay. This AD results from incidents of short circuit failures of certain AC contactors located in the avionics bay. We are issuing this AD to prevent short circuit failures of certain AC contactors, which could result in arcing and consequent smoke or fire.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2006/04/26/06-3990/airworthiness-directives-bombardier-model-cl-600-2b19-regional-jet-series-100-and-440-airplanes)
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