# Proposed AD FAA-2025-2558: De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2026-11-06
- Products: De Havilland Aircraft of Canada
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: September 29, 2025, 90 FR 46538
- Comments due: November 13, 2025
- Became: [AD 2026-11-06](https://openairdocs.org/ad/2026-11-06)
- Docket: FAA-2025-2558 (https://www.regulations.gov/docket/FAA-2025-2558, where comments are filed)
- Project: MCAI-2021-00022-T
- FR document: 2025-18805
- Official PDF: https://openairdocs.org/files/sha256/6b/58/6b58318b96a1be8d5ce2b737a69404727f7ce4fb3c3118eea59a67195c2d2e32 (from https://www.govinfo.gov/content/pkg/FR-2025-09-29/pdf/2025-18805.pdf)
- Federal Register: https://www.federalregister.gov/documents/2025/09/29/2025-18805/airworthiness-directives-de-havilland-aircraft-of-canada-limited-type-certificate-previously-held-by
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2025-18805-00000000000.0001
- Page: https://openairdocs.org/proposed/FAA-2025-2558

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for all De Havilland Aircraft of Canada Limited Model DHC-8 airplanes. This proposed AD was prompted by reports of cracked barrel nuts at the wing front spar and horizontal stabilizer to vertical stabilizer joint. This proposed AD would require repetitive inspections for cracking and corrosion of the affected barrel nuts and applicable corrective actions. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Sep 29, 2025: Notice of proposed rulemaking (NPRM). (first notice), FR document 2025-18805, comments due Nov 13, 2025 (https://www.federalregister.gov/documents/2025/09/29/2025-18805/airworthiness-directives-de-havilland-aircraft-of-canada-limited-type-certificate-previously-held-by)

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