# Airworthiness Directives; De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes
> **Rule** · Final rule. · Published 2024-07-17 · Effective 2024-08-21 · 89 FR 58061
## Document
- **Document number:** 2024-15657
- **Category:** airworthiness
- **Manufacturer:** De Havilland
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 89 FR 58061
- **Publication date:** 2024-07-17
- **Effective date:** 2024-08-21
- **FAA docket:** Docket No. FAA-2023-1885
## 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 reports of moisture in the wing- to-fuselage joint, between the mating front spar and rear spar frame segments. This AD requires a visual inspection of the fuselage front and rear spar frames, an ultrasonic test if applicable, other specified actions, and repair if necessary. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2024/07/17/2024-15657/airworthiness-directives-de-havilland-aircraft-of-canada-limited-type-certificate-previously-held-by)
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