AD/AS 355/97 - Rotor Flight Control - Collective Lever Recess

This Airworthiness Directive requires operators of Eurocopter AS 355 E/F/F1/F2 helicopters (all pre‑MOD 071995) to modify the collective‑lever recess per Eurocopter Alert Service Bulletin No. 67.00.12 Rev 2 (or later) and forbids fitting cover P/N 355A27‑2373‑20. Compliance is required within 550 flight hours or 12 months from the AD’s effective date (13 March 2008). The AD says the measure prevents foreign objects entering the recess and jamming the collective, which could lead to loss of collective pitch control. Operators pay for and schedule the work.