# Airworthiness Directives; MHI RJ Aviation ULC (Type Certificate Previously Held by Bombardier, Inc.) Airplanes
> **Rule** · Final rule; request for comments. · Published 2025-11-05 · Effective 2025-11-20 · 90 FR 49251
## Document
- **Document number:** 2025-19784
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 90 FR 49251
- **Publication date:** 2025-11-05
- **Effective date:** 2025-11-20
- **FAA docket:** Docket No. FAA-2025-3995
## Abstract

The FAA is adopting a new airworthiness directive (AD) for 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. This AD was prompted by reports of loose and missing bolts on the horizontal stabilizer (H-stab) anti- yaw steady fitting block. This AD requires repetitive torque checks of the H-stab anti-yaw steady fitting block bolts. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2025/11/05/2025-19784/airworthiness-directives-mhi-rj-aviation-ulc-type-certificate-previously-held-by-bombardier-inc)
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