Flight Deck  Galley FWD Compt  MID Compt  AFT Compt  Turbine Compressor Water separator  Anti-ice screen Turbine bypass  valve Pack anti- ice valve  Trim air check valve Trim air pressure regulating valve Trim air check valve Trim air pressure regulating valve Flow control valve Ground pneumatic  connector  Engine No. 1 bleed air Engine No. 3  bleed air  Heat to FWD cargo compt  and galley ventilation  Conditioned air check valve  Trim air valve Trim air valve  Trim air valve Ground  conditioned air connector  Trim air valve  Trim air valve Ground  conditioned air connector  Overboard Overboard Water injector Fan Ram air Turbine Compressor Anti-ice screen  Turbine bypass valve Pack anti-ice valve Pressure relief Flow control valve Conditioned air check valve Potable water  Fan Ram air Heat exchanger No. 1 Pack No. 3 Pack No. 2 Pack Heat exchanger Turbine Compressor Water separator Water separator Anti-ice screen Turbine bypass  valve Pack anti-ice valve Isolation valves  Flow control  valve  Ground pneumatic  connector  Heat to center cargo compt  Engine No. 2 / APU bleed air  Heat to AFT bulk cargo compt and AFT LAV ventilation  Conditioned air check valve Overboard Fan Ram air Heat exchanger Figure 16-69.  The air cycle air conditioning system of a DC-10 transport category aircraft uses only one heat exchanger per ACM.  16-42