MD-11 Flight Crew Operations Manual
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Hydraulics Chapter Hyd
Controls and Displays Section 30
Hyd.30.1
Hyd.30 Hydraulics-Controls and Displays
Hydraulic Control Panel
1. SYS1/2/3 PRESS Light - amber
PRESS - Illuminates amber when system pressure is less than 2400 psi or
more than 3500 psi. Extinguishes when system pressure is within limits.
2. 1-3/2-3 RMP Switch - blue/amber
This switch is a momentary switch that controls the RMP shutoff valves when
the system is in manual mode. The switch has no effect in the auto mode.
ON - Illuminates blue when the pump is commanded on (valves commanded
open).
The RMPs are commanded on and provide hydraulic system pressure when:
• Any engine N2 falls below 45 percent during taxi or takeoff and landing
phases of flight.
• The engine-driven pumps are not able to maintain necessary system
pressure during taxi, takeoff and landing phases of flight.
• The pump receives an auto slat extend signal.
DISAG - Illuminates amber when one of the valves does not open and the
RMP is commanded on. DISAG also illuminates if the RMP is commanded
off and the internal pump pressure is more than 600 psi, but is inhibited for 8
seconds when the Hydraulic System Controller (HSC) is in auto.
DB1-2-1761
SYS 1
SYS 2
1-3 RMP
ON
DISAG
H
Y
D
FAULT
FAULT
OFFOFF OFFOFF
OFF OFF
FAULT
FAULT
FAULTFAULT
ON
DISAG
ON
SYS 3
2
TEST
PRESSPRESS PRESS
2-3 RMP
SYSTEM
SELECT
MANUAL
ON
1
2
3
4
5
6
HYD PRESS
TEST
1
(ADG)
L PUMP
R PUMP L PUMP
R PUMP
L PUMP
R PUMP
AUX PUMP
FORWARD OVERHEAD PANEL
October 02, 2006
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