MD-11 Flight Crew Operations Manual
k
Fuel -
Controls and Displays
Fuel.30.4
This switch is guarded, safetied, and amber stripes will be visible on the side
of the switch when not activated.
10. ARM/FILL Valve Switch (Tanks 1, 2, and 3) - blue
The FILL valve switch is a momentary switch that opens and closes the
respective tank fill valves when the system is in the manual mode. Pushing
the switch arms the fill valve for as long as the switch is held. Tank 2 fill valve
will remain armed following switch release if any upper aux tank pump is on.
Tank 1 and 3 fill valves will remain armed following switch release if tank 2
contains more than 18,144 kilograms of fuel. When the fill valve is armed,
pushing the switch causes the fill valve to disarm.
ARM illuminates blue when the respective fill valve is armed.
FILL illuminates blue when the respective fill valve is open. In the auto mode,
the light is inhibited.
11. 1/3 PUMPS LOW/OFF Switch (Tanks 1 and 3) - amber
The tank 1/3 PUMPS switch is a momentary switch that turns the respective
tank forward and aft pumps on and off when the fuel system is in the manual
mode.
LOW illuminates amber when all pumps that are commanded on have low
pressure.
In manual mode, OFF illuminates amber when neither pump is commanded
on. In auto mode, OFF illuminates amber when pumps are off due to suction
feed.
12. XFEED ON/DISAG Switch (3) - blue/amber
The XFEED switch opens and closes the respective crossfeed valves when
the fuel system is in the manual mode.
ON illuminates blue when the respective crossfeed valve is commanded
open.
DISAG illuminates amber when the actual valve position differs from the
commanded position. In the auto mode, the light is inhibited for 4 seconds to
prevent illumination during valve transition.
13. 2 PUMPS LOW/OFF Switch (Tank 2) - amber
The tank 2 PUMPS switch is a momentary switch that turns the forward, left
aft, and right aft tank 2 pumps on and off when the system is in the manual
mode.
LOW illuminates amber when all pumps are commanded on and have low
pressure.
October 02, 2006
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