A320

Major Components Additional Components (Not shown above) Leak Measurement Valves Each system has a leak measurement valve upstream of the primary flight controls. These valves, which measure the leakage in each circuit, are closed by operation of the LEAK MEASUREMENT VALVES pushbutton switch on the maintenance panel. Priority Valves Priority valves cut off hydraulic power

Fire Detection The engines and the APU each have a fire and overheat detection system consisting of: Two identical detection loops (A and B) mounted in parallel A Fire Detection Unit (FDU). The fire detection loops consist of: Three or four (as installed) engine fire sensing elements, in the pylon nacelle, in the engine core,