# Airworthiness Directives; Airbus Canada Limited Partnership (Type Certificate Previously Held by C Series Aircraft Limited Partnership (CSALP); Bombardier, Inc.) Airplanes
> **Rule** · Final rule; request for comments. · Published 2023-12-18 · Effective 2024-01-02 · 88 FR 87329
## Document
- **Document number:** 2023-27677
- **Category:** airworthiness
- **Manufacturer:** Airbus Canada Limited Partnership (Type Certificate Previously Held by C Series
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 88 FR 87329
- **Publication date:** 2023-12-18
- **Effective date:** 2024-01-02
- **FAA docket:** Docket No. FAA-2023-2229
## 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 reported interference between the pilot valve fittings and their mating holes in the rear spar of the center wing box (CWB). This AD requires replacing the pilot valve fittings, as specified in a Transport Canada AD, which is incorporated by reference. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2023/12/18/2023-27677/airworthiness-directives-airbus-canada-limited-partnership-type-certificate-previously-held-by-c)
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