# Proposed AD FAA-2026-0728: MHI RJ Aviation ULC (Type Certificate Previously Held by Bombardier, Inc.) Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2026-08-02
- Products: MHI RJ Aviation ULC
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: January 27, 2026, 91 FR 3394
- Comments due: March 13, 2026
- Became: [AD 2026-08-02](https://openairdocs.org/ad/2026-08-02)
- Docket: FAA-2026-0728 (https://www.regulations.gov/docket/FAA-2026-0728, where comments are filed)
- Project: MCAI-2025-01823-T
- FR document: 2026-01495
- Official PDF: https://openairdocs.org/files/sha256/66/6d/666dbe26d785287d4e0709fef4a4e59413d693ba98ace99298c3c28eb144e366 (from https://www.govinfo.gov/content/pkg/FR-2026-01-27/pdf/2026-01495.pdf)
- Federal Register: https://www.federalregister.gov/documents/2026/01/27/2026-01495/airworthiness-directives-mhi-rj-aviation-ulc-type-certificate-previously-held-by-bombardier-inc
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2026-01495-00000000000.0001
- Page: https://openairdocs.org/proposed/FAA-2026-0728

## Summary

The FAA proposes to supersede Airworthiness Directive (AD) 2025-22-02, which applies to certain MHI RJ Aviation ULC (type certificate previously held by Bombardier, Inc.) Model CL-600-2C10 (Regional Jet Series 700, 701 &702), CL-600-2C11 (Regional Jet Series 550), CL-600-2D15 (Regional Jet Series 705), CL-600-2D24 (Regional Jet Series 900), and CL-600-2E25 (Regional Jet Series 1000) airplanes. AD 2025-22-02 requires repetitive torque checks of the H-stab anti-yaw steady fitting block bolts. Since the FAA issued AD 2025-22-02, it was determined that additional actions must be done to address the unsafe condition. This proposed AD would continue to require the actions in AD 2025-22-02 and would require replacing the H-Stab anti-yaw steady fitting block hardware. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Jan 27, 2026: Notice of proposed rulemaking (NPRM). (first notice), FR document 2026-01495, comments due Mar 13, 2026 (https://www.federalregister.gov/documents/2026/01/27/2026-01495/airworthiness-directives-mhi-rj-aviation-ulc-type-certificate-previously-held-by-bombardier-inc)

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