MD-11 Flight Crew Operations Manual
k
Air -
Controls and Displays
Air.30.3
6. TRIM AIR Switch - amber
The TRIM AIR switch is an alternate action switch that opens/closes the trim
air pressure regulator valves when the system is in manual mode. When on,
hot air tempers the air conditioning system cold air output. When off, hot air
is prevented from entering the trim air manifold. The switch has no effect in
auto mode.
AVNCS OVHT - Illuminates amber when an overheat condition is sensed in
the avionics compartment. Trim air is latched off.
OFF - Illuminates amber when the trim air pressure regulator valves are
commanded off.
7. APU Air Switch - blue/amber
Refer to the APU chapter for switch description.
8. 1-2 ISOL/1-3 ISOL Switch - blue/amber
The 1-2 and 1-3 ISOL switches are alternate action switches that open/close
the respective pneumatic isolation valves when the system is in manual mode.
The switch has no effect in auto mode.
ON - Illuminates blue when the ISOL valve is commanded on. If the APU is
providing the air conditioning, and the air system is in manual mode, ON
illuminates.
DISAG - Illuminates amber when the valve position is not in agreement with
the commanded position. The light is inhibited for ten seconds when the
system is in auto mode. In manual mode, DISAG illuminates when the
isolation valves are in transit.
9. BLEED AIR 1/2/3 MANF/TEMP HI Switch (3) - red
The BLEED AIR 1/2/3 MANF/TEMP HI switch is a momentary switch that
operates in parallel with and identically to the BLEED AIR PRESS 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.
MANF - Illuminates red when a high temperature is sensed in any
compartment through which the respective manifold is routed. A failed or
leaking manifold is indicated.
TEMP HI - Illuminates red when engine bleed air temperature is excessively
high downstream of the precooler.
November 16, 2009
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