# 2026-07736: Bolt Check Time: FAA Mandates Airplane Hardware Replacements

2026-07736, Airworthiness Directives; MHI RJ Aviation ULC (Type Certificate Previously Held by Bombardier, Inc.) Airplanes, is a Federal Register rule from Transportation Department, Federal Aviation Administration published 2026-04-21, effective 2026-05-26; PRIA reads it as touching household money (as of 2026-06-11).

- Canonical: https://policyrisk.com/federal-register/2026-07736
- As of: 2026-06-11
- Plain-text twin of the page above; the HTML and this file carry the same facts.

## Facts
- Document number: 2026-07736
- Title: Airworthiness Directives; MHI RJ Aviation ULC (Type Certificate Previously Held by Bombardier, Inc.) Airplanes
- Type: Rule
- Agencies: Transportation Department; Federal Aviation Administration
- Citation: 91 FR 21245
- Published: 2026-04-21
- Effective: 2026-05-26
- Comments close: not stated
- Significant: no
- Touches household money: yes
- Regulation identifier numbers: 2120-AA64
- Last updated: 2026-06-11

## In one line

Bolt Check Time: FAA Mandates Airplane Hardware Replacements

## Summary

If you fly MHI RJ Aviation ULC regional jets (formerly Bombardier models), listen up! The FAA is updating safety rules to not just keep checking bolts on the horizontal stabilizer but also replace some hardware to keep flights safe. These changes kick in May 26, 2026, and might cost some time and money but are super important for safe skies.

## Abstract

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.

## Effects PRIA read

- Mandatory H‑stab Hardware Replacement: cost, medium. If you operate the listed MHI RJ/Bombardier regional jets, the FAA requires you to continue repetitive torque checks and to replace the horizontal stabilizer (H‑stab) anti‑yaw steady fitting block hardware. This requirement applies to the specified CL‑600‑2C10, CL‑600‑2C11, CL‑600‑2D15, CL‑600‑2D24…
- Estimated Compliance Costs and Scope: cost, medium. The FAA estimates this AD affects 597 U.S.-registered airplanes. The retained actions from AD 2025-22-02 are estimated up to $510 per airplane (up to $304,470 for U.S. operators), the new required actions are estimated $622 per airplane (labor 7 hours at $85/hour plus $27 parts) totaling $371,334 f…
- Fix to Prevent Stabilizer Loss: benefit, high. The AD addresses reports of loose or missing bolts on the H‑stab anti‑yaw steady fitting block that, when combined with a bird strike or gust loading, may result in loss of the horizontal stabilizer and consequent loss of control of the airplane. The FAA issued this AD to eliminate that unsafe cond…

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## Sources
- [2026-07736 on federalregister.gov](https://www.federalregister.gov/documents/2026/04/21/2026-07736/airworthiness-directives-mhi-rj-aviation-ulc-type-certificate-previously-held-by-bombardier-inc)
- [2026-07736 as published (PDF)](https://www.govinfo.gov/content/pkg/FR-2026-04-21/pdf/2026-07736.pdf)

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Source: PRIA, https://policyrisk.com/federal-register/2026-07736 (as of 2026-06-11).