# Proposed AD FAA-2024-2666: 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 2025-12-04
- Products: Airbus Canada Limited Partnership
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: December 20, 2024, 89 FR 104067
- Comments due: February 3, 2025
- Became: [AD 2025-12-04](https://openairdocs.org/ad/2025-12-04)
- Docket: FAA-2024-2666 (https://www.regulations.gov/docket/FAA-2024-2666, where comments are filed)
- Project: MCAI-2024-00261-T
- FR document: 2024-30310
- Official PDF: https://openairdocs.org/files/sha256/ee/d5/eed593fd2fad54cae4367db40f91fee9be8a4a71d21e0830d2a94ea229144aca (from https://www.govinfo.gov/content/pkg/FR-2024-12-20/pdf/2024-30310.pdf)
- Federal Register: https://www.federalregister.gov/documents/2024/12/20/2024-30310/airworthiness-directives-airbus-canada-limited-partnership-type-certificate-previously-held-by-c
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2024-30310-00000000000.0001
- Page: https://openairdocs.org/proposed/FAA-2024-2666

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain Airbus Canada Limited Partnership Model BD-500-1A11 airplanes. This proposed AD was prompted by an investigation of an in- service hydraulic fluid leakage event that indicated the potential use of an uncalibrated torque wrench when tightening the union fittings at the pressure and return interfaces of all three rudder hydraulic power control units (PCUs). This proposed AD would require properly torquing the rudder PCU hydraulic fittings and applying the torque seal on the rudder PCU hydraulic fittings, 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

- Dec 20, 2024: Notice of proposed rulemaking (NPRM). (first notice), FR document 2024-30310, comments due Feb 3, 2025 (https://www.federalregister.gov/documents/2024/12/20/2024-30310/airworthiness-directives-airbus-canada-limited-partnership-type-certificate-previously-held-by-c)

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