.
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.

RAM DOOR FULL OPEN Light
Illuminated (blue) – indicates ram door in full open position.

Air Conditioning PACK Switch
OFF – pack signalled 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.

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.
Copyright . The Boeing Company. See title page for details.
Air Systems -Controls and Indicators 737 Flight Crew Operations Manual

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 - fan signalled 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

.  
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 BLEED TRIP OFF, PACK and ZONE TEMP lights

.  
related engine bleed air valves open, or related pack valves open, or
related air mix valves open

.
lights remain illuminated until reset.

Copyright . The Boeing Company. See title page for details.
2.10.12   September 26, 2003

Air Systems -Controls and Indicators
Equipment Cooling Panel

Equipment (EQUIP) COOLING SUPPLY Switch
NORM – normal cooling supply fan activated.
ALTN – alternate cooling supply fan activated.

Equipment Cooling Supply OFF Light
Illuminated (amber) – no airflow from selected cooling supply fan.

Equipment (EQUIP) COOLING EXHAUST Switch
NORM – normal cooling exhaust fan activated.
ALTN – alternate cooling exhaust fan activated.

Equipment Cooling Exhaust OFF Light
Illuminated (amber) – no airflow from selected cooling exhaust fan.
Copyright . The Boeing Company. See title page for details.
Air Systems -Controls and Indicators 737 Flight Crew Operations Manual

Cabin Altitude Panel

FORWARD OVERHEAD PANEL

CABIN Altimeter (ALT)/Differential Pressure (DIFF PRESS) Indicator
Inner Scale – indicates cabin altitude in feet.
Outer Scale – indicates differential pressure between cabin and ambient in psi.

CABIN Rate of CLIMB Indicator
Indicates cabin rate of climb or descent in feet per minute.

Altitude (ALT) HORN CUTOUT Switch
Push –
.
cuts out intermittent cabin altitude warning horn

.
altitude warning horn sounds when cabin reaches 10,000 feet altitude.

Copyright . The Boeing Company. See title page for details.
2.10.14  September 26, 2003

Air Systems -Controls and Indicators
　
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