Bolt Swap Alert: FAA Orders Fixes for Regional Jet Stabilizers
Published Date: 4/21/2026
Rule
Summary
If you fly or fix certain MHI RJ Aviation ULC regional jets (formerly Bombardier), listen up! The FAA is updating safety rules to not just check but replace some key bolts on the horizontal stabilizer 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.
Analyzed Economic Effects
3 provisions identified: 1 benefits, 2 costs, 0 mixed.
Required bolt replacement and checks
The FAA now requires replacing the horizontal stabilizer (H-stab) anti-yaw steady fitting block hardware and continuing repetitive torque checks for certain MHI RJ (formerly Bombardier) regional jets. The AD is effective May 26, 2026, applies to 597 U.S.-registered airplanes, and the FAA estimates retained actions cost up to $510 per airplane (up to 6 work-hours x $85), while the new replacement action is estimated at $622 per airplane (7 work-hours x $85 = $595 plus $27 in parts), with fleet totals of up to $304,470 and $371,334 respectively.
Prevents potential stabilizer loss
The rule 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 loss of control. Replacing the hardware and continuing checks is intended to reduce that safety risk; the AD becomes effective May 26, 2026.
Possible on-condition repair costs
If inspections or replacements identify additional damage, operators may incur an on-condition action estimated at up to $113 per airplane (1 work-hour x $85 plus up to $28 in parts). The FAA states it cannot predict how many airplanes will need this work.
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