AIRCRAFT HANGARS APPLICATION Aircraft hangars are large, open floor areas with tall roof decks to house high-value aircraft. A fire would cause severe financial losses. TYPICAL RISKS Typical features for Aircraft hangars are:Main fire risk is a spill fire.Aircraft maintenance activities include several potential ignition sources.Large quantities of liquid jet fuel are present. TYPICAL REQUIREMENTS Shadow effect by the wings of the airplane should be considered.Big heights and distances.Combination of sufficient sensitivity, fast response and good resistivity to false alarms is needed.Only allowing unfueled aircraft will drastically lower the impact of a fire, but normally aircraft are fueled, for operations reasons.The floor area strongly varies from 500 m2 for small airplanes to 20000 m2 for the biggest commercial airplanes.Detector choice. Recommended: UV/IR or IR3 Flame Detectors.