737 Flight Crew Operations Manual
Air Systems -
Controls and Indicators
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
2.10.4 D6-27370-866-EGP
2 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.
3 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.
4 RAM DOOR FULL OPEN Light
Illuminated (blue) – indicates ram door in full open position.
5 Air Conditioning PACK Switch
OFF – pack signaled OFF.
AUTO –
• with both packs operating, each pack regulates to low flow
• with one pack operating, 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.
6 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.
September 28, 2006
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