FAA to Helicopter Owners: Check Those Mislabeled Tail Rotors Now!
Published Date: 10/1/2026
Rule
Summary
If you own or work with Airbus Helicopters AS355 models, listen up! The FAA found some tail rotor parts were mislabeled during production, so they’re requiring checks and possible replacements to keep flights safe. Starting November 5, 2026, you’ll need to verify serial numbers and maybe do inspections—plus, some parts can’t be installed anymore. This keeps your helicopter flying safely without surprise costs or delays.
Analyzed Economic Effects
3 provisions identified: 0 benefits, 3 costs, 0 mixed.
Some parts must be replaced or cannot be installed
If inspections show affected parts, you must replace or re-identify them and you may not install certain parts (fan wheel P/N 704A33691014 amdt C and impeller second stage P/N 704A33691015 amdt C with listed S/Ns). Estimated on-condition replacement costs are: replace fan wheel = $1,704 (2 work-hours $170 + parts $1,534), replace impeller second stage = $1,389 (2 work-hours $170 + parts $1,219), balancing tail rotor drive shaft = $170, and other part re-identification actions at $85.
AD applies to all AS355 helicopters
If you own or operate an Airbus Helicopters Model AS355E, AS355F, AS355F1, AS355F2, or AS355N, this AD applies to your helicopter starting November 5, 2026. You must verify the serial number and amend the log card for affected tail rotor drive fan wheels and impeller second stages; the FAA estimates this AD affects four U.S.-registered helicopters.
One-time borescope inspection may be required
Depending on the log-card findings, you may need to perform a one-time borescope inspection of the fan wheel and/or impeller second stage to confirm identification. The estimated labor cost for each borescope inspection is 1 work-hour at $85, and re-identifying a part is estimated at 1 work-hour ($85).
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