MD-11 Flight Crew Operations Manual
k
Air -
Controls and Displays
Air.30.4
10. BLEED AIR 1/2/3 PRESS/OFF Switch (3) - amber
The BLEED AIR 1/2/3 PRESS/OFF switch is a momentary switch that
operates in parallel with and identically to the BLEED AIR 1/2/3
MANF/TEMP HI switch. The switch controls the pneumatic pressure
regulator valve and provides the respective engine bleed air disconnect
capability when in manual mode. The switch has no effect in auto mode.
PRESS - Illuminates amber when the air pressure is less than 11 psi.
OFF - Illuminates amber when bleed air is selected off.
11. PACK 1/2/3 Switch (3) - amber
The PACK switch is a momentary switch controlling the respective pack flow
control valve when the system is in manual mode. When on, air conditioning
system control of the respective pack is provided. When off, the associated
pack flow control valve and ram air door is commanded closed. The switch
has no effect when the system is in auto mode.
FLOW - Illuminates amber when the respective pack is commanded on but
air flow is insufficient to allow it to operate, or the pack is commanded off
and flow is present.
OFF - Illuminates amber when the respective pack is commanded off.
12. PAX LOAD Selector
The number of passengers is entered to the nearest 10 (rounded up) by using
the thumbwheels. The range is 100 to 590. The airflow rate through the packs
is adjusted for passenger comfort.
In economy mode, the recirculation fans are on and the packs provide a
minimum of ten cubic feet per minute of fresh air per passenger. The default
of 240 passengers is selected by the ACC when a passenger number less than
240 is selected.
October 02, 2006
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