Electric motor-driven pump.
Both hydraulic systems A and B also have an associated electric motor-driven pump. These produce hydraulic fluid pressure of 3,000 psi.
The power source for the System A pump is AC Transfer Bus 2, while the source for the System B pump is AC Transfer Bus 1.
Both pumps use fluid for cooling and lubrication. The heat exchangers for systems A and B are located in main fuel tanks #1 and #2 respectively. Because fuel is required to cool the fluid, a minimum amount of 1,675 lbs of fuel in the related fuel tank is required.
Although the EDMPs will automatically shut off when they sense a high temperature, the EDMP switch must be manually shut off as part of the non-normal checklist.