MD-11 Flight Crew Operations Manual
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Hydraulics -
Controls and Displays
Hyd.30.2
ON and DISAG extinguish when the pump is commanded off. This pump is
commanded off when:
• It is not required for the phase of flight.
• The associated hydraulic reservoir has less than 1.0 gallon of fluid (all
phases of flight).
• The Air Driven Generator (ADG) is released and the ADG switch is in
the hydraulic position.
3. Electric AUX PUMP 1 (ADG)/2 Switch - blue
The electric AUX PUMP switch is a momentary switch that commands the
electric auxiliary hydraulic pump on and off when the system is in manual or
auto mode. The aux pumps are under automatic control only during the
manually activated preflight hydraulic pressure test.
ON - Illuminates blue when the AUX PUMP is commanded ON. When on,
the applicable pump supplies pressure to hydraulic system 3.
When either pump is commanded ON, the recirculation fans are
automatically commanded off. When the pumps are commanded off, the
recirculation fans are automatically commanded on.
AUX PUMP 1 is powered by the ADG when the ADG is deployed in the
hydraulic mode.
4. HYD SYSTEM SELECT/MANUAL Switch - amber
This is an alternate action switch that allows selection between manual and
auto modes.
There are 2 alternating auto channels. During auto operation, one of the 2 auto
channels is not used. Each time auto is selected, the previous unused auto
channel is activated.
SELECT - Illuminates amber when the system reverts to manual with auto
selected. The SEL HYD SYS MAN alert is displayed on the EAD. Pushing
the HYD SYSTEM SELECT/MANUAL switch locks the system in manual.
MANUAL - Illuminates amber when the system is in manual.
MANUAL - Flashes amber when auto is selected and a switch on the HYD
control panel has been pushed that has no effect in auto.
5. HYD PRESS TEST Switch - blue
The HYD PRESS TEST switch is a guarded momentary switch that initiates
the hydraulic pressure test in the HSC. The switch has no effect when the
system is in manual.
TEST - Illuminates blue when testing is in progress.
October 02, 2006
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