The Fiat G.91 is a lightweight tactical ground attack aircraft designed for simplicity and agility. It is a subsonic aircraft, being powered by a single Bristol Siddeley Orpheus turbojet engine. A key function of the aircraft is its short-field capability, having been constructed with a rugged airframe to withstand the demands imposed by high-intensity operations and the use of semi-prepared airstrips; the undercarriage is furnished with low-pressure tyres for the same purpose. The standard mission of the G.91 was the attack of targets within a 170-mile radius of its base with a typical loiter time of ten minutes, travelling at maximum speed in the combat area and traversing at cruise speeds.