# Airworthiness Directives; Bombardier, Inc. Airplanes
> **Rule** · Final rule. · Published 2015-08-28 · Effective 2015-10-02 · 80 FR 52179
## Document
- **Document number:** 2015-20959
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 80 FR 52179
- **Publication date:** 2015-08-28
- **Effective date:** 2015-10-02
- **FAA docket:** Docket No. FAA-2015-0823
## Abstract

We are adopting a new airworthiness directive (AD) for certain Bombardier, Inc. Model CL-600-2B19 (Regional Jet Series 100 & 440) airplanes. This AD was prompted by results of a design review indicating that the burst pressure of the flexible hose, used to vent oxygen from the high-pressure relief valve of the oxygen cylinder overboard, was lower than the opening pressure of the high-pressure relief valve, which could cause the flexible hose to burst before it can vent the excess oxygen overboard. This AD requires replacing the oxygen hose assembly with a new, improved assembly. We are issuing this AD to prevent the accumulation of oxygen in an enclosed space, which could result in an uncontrolled oxygen-fed fire if an ignition source is nearby.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2015/08/28/2015-20959/airworthiness-directives-bombardier-inc-airplanes)
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