# Airworthiness Directives; De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes
> **Rule** · Final rule. · Published 2020-02-06 · Effective 2020-03-12 · 85 FR 6749
## Document
- **Document number:** 2020-02201
- **Category:** airworthiness
- **Manufacturer:** De Havilland
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 85 FR 6749
- **Publication date:** 2020-02-06
- **Effective date:** 2020-03-12
- **FAA docket:** Docket No. FAA-2019-0702
## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain De Havilland Aircraft of Canada Limited Model DHC-8-400 series airplanes. This AD was prompted by a report of a quality escape in the manufacturing of advanced pneumatic detector (APD) switches, which consisted of the presence of contamination on the switch contact pin. This AD requires identification and testing, and reidentification or replacement if necessary, of affected APDs. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2020/02/06/2020-02201/airworthiness-directives-de-havilland-aircraft-of-canada-limited-type-certificate-previously-held-by)
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