# Airworthiness Directives; Bombardier Model CL-600-2B19 (Regional Jet Series 100 & 440) Airplanes
> **Rule** · Final rule; request for comments. · Published 2006-08-23 · Effective 2006-09-07 · 71 FR 49337
## Document
- **Document number:** E6-13831
- **Category:** airworthiness
- **Manufacturer:** Bombardier Model CL-600-2B19 (Regional Jet Series 100 & 440)
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 71 FR 49337
- **Publication date:** 2006-08-23
- **Effective date:** 2006-09-07
- **FAA docket:** Docket No. FAA-2006-25657
## Abstract

The FAA is superseding an existing airworthiness directive (AD) that applies to certain Bombardier Model CL-600-2B19 (Regional Jet Series 100 & 440) airplanes. The existing AD currently requires inspecting contactors 1K4XD, 2K4XD, and K4XA to determine the type of terminal base plate, and applying sealant on the terminal base plates, if necessary. This new AD revises the effective date of the existing AD. This AD results from incidents of short circuit failures of certain alternating current (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/2006/08/23/E6-13831/airworthiness-directives-bombardier-model-cl-600-2b19-regional-jet-series-100-and-440-airplanes)
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