2026-21387Proposed RuleWallet

FAA Wants Airbus Helicopter Owners to Tighten a Rotor Nut

Published Date: 10/19/2026

Proposed Rule

Summary

The FAA wants all owners of certain Airbus Helicopters to check the tightness of a key nut on the main rotor servo-control to prevent safety issues. If the nut isn’t tight enough, they’ll need to fix it and report the results. Comments on this plan are open until December 3, 2026, so act fast to keep your helicopter flying safe and sound!

Analyzed Economic Effects

5 provisions identified: 1 benefits, 4 costs, 0 mixed.

Possible costly repairs if defects found

If the inspection finds problems, corrective actions can include cleaning threads, inspecting threads, replacing one ball bearing end (up to $615 including labor), or replacing one MR servo-control (up to $54,640 including labor and parts). The FAA states it cannot predict how many helicopters will require these replacements.

Mandatory nut-torque inspection for MR servo-controls

If you own or operate an Airbus Helicopters Model AS350B3, AS355F, AS355F1, AS355F2, AS355N, AS355NP, EC130B4, or EC130T2, you must inspect the tightening torque of the nut at the upper ball bearing end of each main-rotor (MR) servo-control. The rule requires a one-time inspection and also requires inspecting the nut torque after every removal and installation of an MR servo-control, in accordance with EASA AD 2026-0132 (dated July 8, 2026).

FAA estimates fleet and aggregate compliance costs

The FAA estimates this proposed AD would apply to 980 U.S.-registered helicopters. The FAA estimates total inspection costs on U.S. operators of $269,500 for the torque inspections and $83,300 for the reporting burden, using its unit cost assumptions.

Mandatory reporting of inspection results

You must report the inspection results to the authority as required by the AD; reporting is a mandatory information collection under OMB Control Number 2120-0056. The FAA estimates public reporting will take about 1 hour per response.

Credit if you already followed April 1, 2026 service bulletins

If you performed the required inspection actions before the AD's effective date using Airbus Service Bulletin AS350-67-30-0002 (dated 2026-04-01), AS355-67-30-0001 (dated 2026-04-01), or EC130-67-30-0001 (dated 2026-04-01), you get credit and do not need to repeat those actions to comply with this AD.

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Key Dates

Published Date
Comments Due
10/19/2026
12/3/2026

Department and Agencies

Department
Independent Agency
Agency
Transportation Department
Federal Aviation Administration
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