# Airworthiness Directives; Airbus Canada Limited Partnership (Type Certificate Previously Held by C Series Aircraft Limited Partnership (CSALP); Bombardier, Inc.) Airplanes
> **Rule** · Final rule. · Published 2025-10-02 · Effective 2025-11-06 · 90 FR 47526
## Document
- **Document number:** 2025-19388
- **Category:** airworthiness
- **Manufacturer:** Airbus Canada Limited Partnership (Type Certificate Previously Held by C Series
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 90 FR 47526
- **Publication date:** 2025-10-02
- **Effective date:** 2025-11-06
- **FAA docket:** Docket No. FAA-2025-0206
## 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 an investigation that showed a change in the feed-through connector O-ring material at a certain frame increased the electrical bonding resistance due to the current torque specification being inadequate. This AD requires electrical bonding tests between the feed-through connectors and the forward side of the bulkhead at a certain frame, and the installation of two electrical bonding plates, as applicable. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2025/10/02/2025-19388/airworthiness-directives-airbus-canada-limited-partnership-type-certificate-previously-held-by-c)
---
*AI Analytics · CC0 1.0*