气动活门、作动器 Pneumatic Valve, Actuator 空调系统(热交换器、压力调节器等)Air Conditioning(Heat-Exchanger, Pressure regulator) 液压系统 Hydraulic Systems 操纵系统 Flight Controls
ATA-21,27 ,28,29,30,32,36,47,50,
52,78,79等