MD-11 Flight Crew Operations Manual
k
Air -
Controls and Displays
Air.30.2
MANUAL - Illuminates when the system is in manual. Also, MANUAL
flashes when the system is in auto and a switch on the AIR control panel is
pushed that has no effect in auto.
3. ECON Switch - red/amber
The ECON switch is an alternate action switch that starts/stops the economy
operation of the packs and recirculation fans. ECON mode may be manually
selected on/off when the Environmental Systems Controller (ESC) is
operating in auto or in manual.
In ECON mode, the packs operate on low and the recirculating fans are
sequenced on. When not in ECON mode, the packs operate normally and the
recirculating fans are off.
The Air Conditioning Controllers (ACC) and the ESC automatically turn the
ECON mode on and off, as required by flight conditions.
CAB ALT - Illuminates red when cabin altitude is above 10,000 feet.
OFF - Illuminates amber when ECON mode is manually selected off.
4. MASK Switch - red
The NO MASKS switch is a guarded momentary switch that illuminates if
cabin altitude exceeds approximately 14,770 feet and the automatic systems
have not deployed the oxygen masks.
NO MASKS - Illuminates red when pushed and held for more than 3 seconds.
The oxygen mask deploys by using an independent electrical source. The red
light in the switch extinguishes.
5. AVNCS FAN Switch - amber
The AVNCS FAN switch is an alternate action switch that starts/stops
override operation of the avionics exhaust fan and the venturi shutoff valve
when the system is in manual mode. Normal operation provides automatic
cooling airflow through the avionics compartment. Override operation closes
the venturi shutoff valve and turns on the avionics exhaust fan. The switch has
no effect when the system is in auto mode.
FLOW - Illuminates amber when cooling airflow through the avionics is
below normal, or cabin inflow is insufficient for pressurization, or cabin
altitude is greater than 10,000 feet.
OVRD - Illuminates amber when the avionics fan and the venturi valve are
commanded to override.
October 02, 2006
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