The O.S. TYPE 20C automatic carburettor, fitted to the O.S. MAX-32SX-H helicopter engine, incorporates an automatic mixture control device to ensure a correctly balanced fuel and air mixture at all throttle settings. It provides steady revolutions and a smooth response for reliable helicopter ascent and descent. The carburettor features two adjustable controls: the Needle Valve for maximum power at full throttle and the Mixture Control Valve for adjusting the mixture strength at part-throttle and idling speeds.