Polyvalent air inlet for turboshaft engine of e.g. helicopter, has movable closing unit for closing non filtering air inlets when aircraft is at proximity of ground and filtering air inlets during flying of aircraft

摘要

The inlet has radial filtering air inlets (11) provided with particle filters (14) and filtering external air before the air is passed into turboshaft engines (3, 4). Radial non filtering air inlets (12) are protected by a grid (13). A movable closing unit (15) e.g. hollow cylinder, closes the air inlets (12) when an aircraft is at the proximity of the ground and air inlets (11) during flying of the aircraft. The air inlets (11, 12) are respectively arranged along two planes (P1, P2), where the plane (P2) presents an angle of 90 degrees with respect to the plane (P1).