ENGINE FUEL SYSTEM D/O (3)GENERAL OPERATION (continued) SHUTDOWNDuring a normal engine shut down, when the ENGine MASTER switch is selected OFF, the fuel shut-off TM is directly controlled to close the PRSOV. This command overrides any EEC command to make sure that the operator always has the option to shut down the engine for any reason. The LP fuel valve also closes when the Master switch is selected OFF. The shut-off servo pressure helped by the spring force, hydraulically closes the PRSOV. When the PRSOV closes, the dump valve opens and the fuel is drained to the drain tank. The ENGine FIRE P/B also controls the LP fuel valve to the closed position in order to isolate the engine from the fuel tanks.The EEC receives a closed position signal from the PRSOV microswitches.