The new 400ppm ASU was recently designed and developed by GUINAULT engineers to start up all aircrafts type including the most difficult to start up: the B777 with GE90 engine. This new design ASU is fitted with Detroit Diesel engine and GHH-Rand screw compressor. Its exclusive air flow regulation system automatically regulates to engine speed according to aircraft air flow requirement. As a consequence, fuel consumption and noise level are optimised according to each aircraft type.