# Airworthiness Directives; De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes
> **Rule** · Final rule. · Published 2024-11-26 · Effective 2024-12-31 · 89 FR 93162
## Document
- **Document number:** 2024-27593
- **Category:** airworthiness
- **Manufacturer:** De Havilland
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 89 FR 93162
- **Publication date:** 2024-11-26
- **Effective date:** 2024-12-31
- **FAA docket:** Docket No. FAA-2024-1692
## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain De Havilland Aircraft of Canada Limited Model DHC-8-401 and - 402 airplanes. This AD was prompted by a report of an in-flight event where isolation valve caution messages were received. This AD requires inspecting the fuse/shuttle valve serial numbers, and replacing certain fuse/shuttle valves, as specified in a Transport Canada AD, which is incorporated by reference (IBR). The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2024/11/26/2024-27593/airworthiness-directives-de-havilland-aircraft-of-canada-limited-type-certificate-previously-held-by)
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