MD-11 Flight Crew Operations Manual
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Hydraulics -
Controls and Displays
Hyd.30.3
The switch, when pushed, tests the electric aux pumps and RMPs. If the test
is stopped before completion, the RMPs and aux pumps turn off. If the
electric AUX PUMP switches are pushed during the test, the test stops.
6. SYS 1/2/3 L/R PUMP Switches - amber
These system (SYS 1/2/3) switches command the left (L) engine-driven
hydraulic pump on or off, and the right (R) engine-driven pump armed or off,
when the respective system is in manual mode. The respective switches have
no effect when the system is in auto.
The right pump is armed when the L PUMP switch is commanded on. If the
left pump pressure is less than 2400 psi, the right pump is commanded on.
FAULT - Illuminates amber on the respective system PUMP switch when
pump pressure is less than 2400 psi and the pump is on, or the pump case
drain temperature is more than 100°C.
Both FAULT and OFF on the L PUMP switch are extinguished when the left
pump is pressurizing its respective hydraulic system (SYS 1/2/3).
Both FAULT and OFF on the R PUMP switch are extinguished when the
right pump is armed or is pressurizing its respective hydraulic system (SYS
1/2/3).
The pumps are commanded off when:
• Pump pressure is low.
• Pump case drain temperature is high.
• Fluid quantity is low.
• System temperature is high.
• System pressure is low.
• System pressure is high.
• The engine is started.
• The engine FIRE handle is pulled.
October 02, 2006
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