Air intake system of an aircraft

In an air intake system for use in an aircraft having an airframe, said air intake system including a main air intake port at an upper surface of the airframe, whereby during normal cruising flight suitable air intake will be through said main air intake port and a lower surface of the airframe will have low reflectiveness of radar beam irradiation from below, but whereby during flight at a large angle of attack and at high maneuverability air turbulence at said main air intake port will prevent suitable air intake therethrough, the improvement comprising means for ensuring suitable air intake at flight at said large angle of attack and at high maneuverability and for maintaining said low reflectiveness during normal cruising flight, said means comprising:

• an auxiliary air intake port at the lower surface of the airframe intake of air therethrough;
• and
• closure means mounted on said air frame for movement between an open position, whereat said closure means opens said auxiliary air intake port and allows suitable air intake therethrough during flight at said large angle of attack and at high maneuverability, and a closed position, whereat said closure means closes said auxiliary air intake port and thereby maintains said low reflectiveness during normal cruising flight.