Indicates temperature at location selected with AIR TEMP source selector.
ZONE TEMP Lights
Illuminated (amber) –
CONT CAB indicates a duct temperature overheat or failure of the flight deck primary and standby temperature control.
FWD CAB or AFT CAB indicates duct temperature overheat.
During Master Caution light recall:
CONT CAB indicates failure of the flight deck primary or standby temperature control
Either FWD CAB or AFT CAB indicates failure of the associated zone temperature control.
Lights will extinguish when Master Caution is reset.
Temperature Selector
AUTO: Provides automatic temperature control for the associated zones. Rotating the control toward C (cool) or W (warm) manually sets the desired temperature.
OFF: Closes the associated trim air modulating valve.
Air Conditioning PACK Switch
OFF:
Turns pack OFF.
AUTO:
With both packs operating, each pack regulates to low flow.
With one pack operating, the operating pack regulates to high flow in flight with flaps up.
When operating one pack from APU (both engine BLEED air switches OFF), regulates to high flow.
HIGH:
Pack regulates to high flow.
Provides maximum flow rate on ground with APU BLEED air switch ON.
AIR Temperature (TEMP) Source Selector
SUPPLY DUCT: Selects appropriate zone supply duct temperature.
PASS CAB: Selects forward or aft passenger cabin temperature.
PACK: Selects left or right pack temperatures.
TRIM AIR Switch
ON: Trim air pressure regulating and shutoff valve signaled open.
OFF: Trim air pressure regulating and shutoff valve signaled closed.
Recirculation (RECIRC) FAN Switches
OFF: Turns fan off.
AUTO:
In-flight:
The left recirculation fan operates if both packs are operating unless either PACK switch is in HIGH.
The right recirculation fan operates if both packs are operating unless both PACK switches are in HIGH.
On the ground:
The left recirculation fan operates unless both PACK switches are in HIGH.
The right recirculation fan operates even if both PACK switches are in HIGH.
PACK Light
Illuminated (amber):
Indicates pack trip off or failure of both primary and standby pack controls, or
Indicates failure of the Flow Control Valve to open when commanded on, or
An incorrect pack switch configuration after takeoff – turning either PACK switch ON will extinguish both PACK lights if lights illuminated because of a configuration problem.
During Master Caution recall:
Indicates failure of either primary or standby pack control.
Extinguishes when Master Caution is reset.
TRIP RESET Switch
Push (if fault condition is corrected):
Resets PACK, ZONE TEMP, and BLEED lights.
Related engine bleed valve opens, or related pack valve opens, or related trim air modulating valve opens.
