# Airworthiness Directives; Bombardier Model CL-600-2B19 (Regional Jet Series 100 & 440) Airplanes
> **Rule** · Final rule. · Published 2006-01-25 · Effective 2006-03-01 · 71 FR 4040
## Document
- **Document number:** 06-617
- **Category:** airworthiness
- **Manufacturer:** Bombardier Model CL-600-2B19 (Regional Jet Series 100 & 440)
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 71 FR 4040
- **Publication date:** 2006-01-25
- **Effective date:** 2006-03-01
- **FAA docket:** Docket No. FAA-2005-22793
## 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 replacing the Gask-O-Seal in the coupling of the refuel/defuel shut-off valves. This AD results from a report that Gask-O-Seals that did not incorporate an integral restrictor to limit fuel flow rate and fuel pressure during refueling were installed on certain airplanes. We are issuing this AD to prevent a buildup of excessive static charge, which could create an ignition source inside the fuel tank.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2006/01/25/06-617/airworthiness-directives-bombardier-model-cl-600-2b19-regional-jet-series-100-and-440-airplanes)
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