# Airworthiness Directives; Airbus Canada Limited Partnership (Type Certificate Previously Held by C Series Aircraft Limited Partnership (CSALP); Bombardier, Inc.) Airplanes
> **Rule** · Final rule. · Published 2020-12-30 · Effective 2021-02-03 · 85 FR 86462
## Document
- **Document number:** 2020-28860
- **Category:** airworthiness
- **Manufacturer:** Airbus Canada Limited Partnership (Type Certificate Previously Held by C Series
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 85 FR 86462
- **Publication date:** 2020-12-30
- **Effective date:** 2021-02-03
- **FAA docket:** Docket No. FAA-2020-0683
## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain Airbus Canada Limited Partnership Model BD-500-1A10 and BD-500- 1A11 airplanes. This AD was prompted by a report that during installation on the final assembly line, a foreign object damage (FOD) protective end cap was not removed from an extraction duct of the crew oxygen system. The protective end cap must be removed to prevent a build-up of oxygen under the flight deck floor, which is a fire risk. This AD requires inspecting the air extraction duct installation to determine if a protective end cap is installed, and removing any protective end cap found. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2020/12/30/2020-28860/airworthiness-directives-airbus-canada-limited-partnership-type-certificate-previously-held-by-c)
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