- 楼主 [讨论]737NG EDP关断活门电路如何理解 2016-12-15 11:58:54.0
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The EDP and the electric motor-driven pump (EMDP) each have a switch on
the hydraulic panel. The switches have two positions, ON and OFF.
The ENG 1 HYD PUMP switch controls the EDP for system A. The ENG 2
HYD PUMP switch controls the EDP for system B. Each pump has a
depressurization solenoid valve. The valve blocks pump output pressure to
the main hydraulic power system when the ENG 1 or ENG 2 HYD PUMP
switch is in the OFF position.
Engine Fire Switches
The engine fire switches isolate the engine if there is an engine fire. Each
engine fire switch controls the supply shutoff valve for its related EDP.
When you operate one of the engine fire switches, the pump LOW
PRESSURE amber light is disarmed and the hydraulic fluid supply to the
related EDP stops.