AD 2025-24-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus | Helicopters Model AS355E | Airworthiness Directives; Airbus Helicopters |
Unsafe Condition
Cracking in the upper fin spar and fracturing of the front attachment screws could result in in-flight separation of the upper part of the vertical fin and consequent loss of control of the helicopter.
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Required Actions
Replace the upper fin assembly with a modified upper fin assembly (P/N 355A14-0522-1751). Perform repetitive inspections of the right-hand side of the vertical fin spar and vertical fin upper attachments for discrepancies (cracking), with corrective action if necessary. Revise the rotorcraft flight manual (RFM) and install a placard to add a speed limitation.
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Compliance Time
Before further flight
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Affected Aircraft
Airbus Helicopters Model AS355E, AS 355-F, AS 355-F1, AS355F2, AS355N, and AS355NP helicopters, all serial numbers, and Model AS 350B3 helicopters, all serial numbers except those that have Airbus Helicopters Modification 073148 in production.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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