# Proposed AD FAA-2026-4634: 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: Comment period closed
- Products: Airbus Canada Limited Partnership
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: May 12, 2026, 91 FR 25809
- Comments due: June 26, 2026
- Docket: FAA-2026-4634 (https://www.regulations.gov/docket/FAA-2026-4634, where comments are filed)
- Project: MCAI-2024-00508-T
- FR document: 2026-09381
- Official PDF: https://openairdocs.org/files/sha256/5e/05/5e056534d0c4a017dd0256515f685058e189dc1f1958363ac863b850412a21cb (from https://www.govinfo.gov/content/pkg/FR-2026-05-12/pdf/2026-09381.pdf)
- Federal Register: https://www.federalregister.gov/documents/2026/05/12/2026-09381/airworthiness-directives-airbus-canada-limited-partnership-type-certificate-previously-held-by-c
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2026-09381-00000000000.0001
- Page: https://openairdocs.org/proposed/FAA-2026-4634

## Summary

The FAA proposes to supersede Airworthiness Directive (AD) 2022-25-05, which applies to certain Airbus Canada Limited Partnership Model BD-500-1A10 and BD-500-1A11 airplanes. AD 2022-25-05 requires repetitive cleaning and greasing of all slat tracks to prevent damage or corrosion; doing repetitive inspections of the slat tracks for any damage or corrosion, and the correct application of grease; and applicable corrective actions. Since the FAA issued AD 2022-25-05, it has been discovered that previous slat track repairs required the use of inappropriate non-destructive test (NDT) methods and, therefore, may have allowed cracks to remain undetected on slat tracks that were previously repaired. This proposed AD would continue to require the actions in AD 2022-25-05 and would require a rework NDT inspection on all slat tracks previously repaired using an inappropriate NDT method. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- May 12, 2026: Notice of proposed rulemaking (NPRM). (first notice), FR document 2026-09381, comments due Jun 26, 2026 (https://www.federalregister.gov/documents/2026/05/12/2026-09381/airworthiness-directives-airbus-canada-limited-partnership-type-certificate-previously-held-by-c)

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