Helicopter Tail Fins Face Mandatory Crackdown Inspections
Published Date: 12/8/2025
Rule
Summary
If you fly certain Airbus Helicopters like the AS355 or some AS350B3 models, this new rule means you’ll keep checking the vertical fin for cracks like before—but now you also have to replace the upper fin with a new, safer version. This replacement stops the need for those repeated inspections. The rule kicks in January 12, 2026, so get ready to upgrade and keep your helicopter flying safe!
Analyzed Economic Effects
4 provisions identified: 0 benefits, 3 costs, 1 mixed.
Required upper-fin replacement
If you operate Airbus Helicopters Model AS350B3 or AS355 (AS355E, AS355‑F, AS355‑F1, AS355F2, AS355N, AS355NP), you must replace the upper fin assembly with the modified upper fin assembly P/N 355A14-0522-1751. That replacement is a terminating action for the repetitive inspections. This AD is effective January 12, 2026; the FAA estimates the modification cost is $26,975 per helicopter and $17,533,750 across 650 U.S.-registered helicopters.
Ongoing repetitive inspections kept
Until you install the modified upper fin assembly, you must continue the repetitive cleaning and visual/detailed inspections of the right-hand side of the vertical fin spar and upper attachments for cracks as required by the AD. The FAA estimates the cost to clean and inspect the vertical fin spar is $213 per helicopter and $138,450 total for U.S. operators. These inspection obligations remain in force under the AD effective January 12, 2026.
RFM amendment and placard (speed limit)
The AD requires amending the rotorcraft flight manual (RFM) and installing a placard to add a speed limitation (a VNE reduction) as specified in the incorporated EASA AD; this AD item is effective January 12, 2026. The FAA estimates the cost to amend the RFM and install the placard is $110 per helicopter and $71,500 for U.S. operators.
On-condition inspection and repair costs
If inspections require a dye-penetrant inspection (DPI) or fluorescent penetrant inspection (FPI) as specified, the FAA estimates an on-condition DPI/FPI cost of $85 per action. The AD states repair costs for any damage found will vary by helicopter and may be covered under warranty per the manufacturer.
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