INBD FWD INBD FWD No. 1 Pump pressure Rear spar Wing structure Tubing coil Mounting clamp (3 places) Hydraulic line connectors No. 1 Engine pump supply To No. 1 hydraulic pump No. 1 pump pressure From case drain filter Hydraulic system A heat exchanger Bonding jumper Hydraulic supply (fire) shutoff valve Case drain return line Outlet Inlet Figure 12-65.  Boeing 737 hydraulic case drain fluid heat exchanger installed in the fuel tank. Left and Right System Description 12-43 The left and right hydraulic systems are functionally the same.  The left hydraulic system supplies pressurized hydraulic  fluid to operate the left thrust reverser and the flight control  systems. The right hydraulic system supplies pressurized  thrust reversers, primary flight controls, landing gear, and  flaps/slats. Under emergency conditions, hydraulic power is  generated by the ram air turbine (RAT), which is deployed  automatically and drives a variable displacement inline pump.  The RAT pump provides flow to the center system flight  controls.  [Figure 12-66]