MD-11 Flight Crew Operations Manual
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APU -
Controls and Displays
APU.30.4
APU Air Switch
1. APU Air Switch - blue/amber
This switch is an alternate action switch that opens and closes the APU load
bleed valve.
ON - Illuminates blue when the valve is selected open.
USE ENG AIR - Illuminates amber when the APU air switch is on and cabin
differential pressure is more than 1.3 psi.
If APU air is desired for engine start, this switch must be pushed prior to
pulling the ENG START switch.
NOTE: When the air system is in auto mode, the 1-2 and 1-3 isolation
valves are automatically controlled.
MANF
PRESS
OFF
APU
AIR 2
AIR 3
1-3 ISOL
BLEED
BLEED
MANF
PRESS
OFF
TEMP HI
TEMP HI
USE ENG
AIR
ON
DISAG
ON
1
FORWARD OVERHEAD PANEL
DB1-2-1627
October 02, 2006
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