# Proposed AD FAA-2025-0206: Airbus Canada Limited Partnership (Type Certificate Previously Held by C Series Aircraft Limited Partnership (CSALP); Bombardier, Inc.) Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2025-19-07
- Products: Airbus Canada Limited Partnership
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: February 19, 2025, 90 FR 9876
- Comments due: April 7, 2025
- Became: [AD 2025-19-07](https://openairdocs.org/ad/2025-19-07)
- Docket: FAA-2025-0206 (https://www.regulations.gov/docket/FAA-2025-0206, where comments are filed)
- Project: MCAI-2024-00525-T
- FR document: 2025-02748
- Official PDF: https://openairdocs.org/files/sha256/a0/c9/a0c9b6ab541252eb3ba37c8c0629734ddcb9ada52126c02525b0bb5ddcba9897 (from https://www.govinfo.gov/content/pkg/FR-2025-02-19/pdf/2025-02748.pdf)
- Federal Register: https://www.federalregister.gov/documents/2025/02/19/2025-02748/airworthiness-directives-airbus-canada-limited-partnership-type-certificate-previously-held-by-c
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2025-02748-00000000000.0001
- Page: https://openairdocs.org/proposed/FAA-2025-0206

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain Airbus Canada Limited Partnership Model BD-500-1A10 and BD- 500-1A11 airplanes. This proposed 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 proposed AD would require 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 of connectors, as applicable, as specified in a Transport Canada AD, which is proposed for incorporation by reference (IBR). The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Feb 19, 2025: Notice of proposed rulemaking (NPRM). (first notice), FR document 2025-02748, comments due Apr 7, 2025 (https://www.federalregister.gov/documents/2025/02/19/2025-02748/airworthiness-directives-airbus-canada-limited-partnership-type-certificate-previously-held-by-c)

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