Airworthiness Directives; MHI RJ Aviation ULC (Type Certificate Previously Held by Bombardier, Inc.) Airplanes

Built by the Tribune's code from the Federal Register. No AI wrote this page. Published in the Federal Register April 21, 2026. Document 2026-07736. Updated Nov. 12, 2026.

What it does

The FAA is superseding Airworthiness Directive (AD) 2025-22- 02, which applied 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 required repetitive torque checks of the horizontal stabilizer (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 AD continues to require the actions in AD 2025-22-02 and requires replacing the H-stab anti-yaw steady fitting block hardware. The FAA is issuing this AD to address the unsafe condition on these products.

The Federal Aviation Administration's summary, as published in the Federal Register.

What changed in the regulation

1 part of Title 14 of the Code of Federal Regulations:

14 CFR 39

Wording on eCFR: the day before it took effect and from the day it took effect (first part listed).

Compared with

The Federal Aviation Administration has published 485 final rules in 2026 so far, compared with 518 in all of 2025.

Counted by the Tribune from Federal Register records since Jan. 1, 2025.

Before this

747 earlier Federal Register documents under regulation identifier 2120-AA64 since Jan. 1, 2025.

April 21, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Various Helicopters
April 15, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Airbus Helicopters
April 15, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Airbus SAS Airplanes
April 14, 2026 Final rule. Airworthiness Directives; Pilatus Aircraft Ltd. Airplanes
April 14, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Columbia Helicopters, Inc. and Restricted Category Model CH-47D Helicopters
April 14, 2026 Final rule; request for comments. Airworthiness Directives; Airbus SAS Airplanes
April 14, 2026 Final rule. Airworthiness Directives; Airbus Helicopters
April 14, 2026 Final rule; removal. Airworthiness Directives; Airbus Helicopters

Since then:

What happens next and when

This AD is effective May 26, 2026.

The agency's dates, word for word.

Check it yourself

The record as published

Document number	2026-07736
Action	Final rule.
Agencies	Transportation Department; Federal Aviation Administration
Published	April 21, 2026
Effective date	May 26, 2026
Regulation identifier (RIN)	2120-AA64
Docket	FAA-2026-0728

Source: the Federal Register (public domain). The document in the Federal Register