.  
related engine bleed valve opens, or related pack valve opens, or related air mix valve opens

.  
lights remain illuminated until reset.

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

Air Systems -Controls and Indicators
Air Conditioning Controls and Indicators
YA613 - YA809 YA721 - YA809
PACK TRIP OFF 
WING-BODY OVERHEAT 
BLEED TRIP OFF 

PACK TRIP OFF 
WING-BODY OVERHEAT 
BLEED TRIP OFF 

Copyright . The Boeing Company. See title page for details.
September 26, 2003  2.10.5

Air Systems -Controls and Indicators

YA613 - YA687
PACK TRIP OFF 
WING-BODY OVERHEAT 
BLEED TRIP OFF 

PACK TRIP OFF 
WING-BODY OVERHEAT 
BLEED TRIP OFF 

AIR Temperature (TEMP) Source Selector
SUPPLY DUCT – selects main distribution supply duct sensor for TEMP indicator.
PASS CABIN – selects passenger cabin sensor for TEMP indicator.
Copyright . The Boeing Company. See title page for details.
2.10.6  September 26, 2003

Air Systems -Controls and Indicators 737 Flight Crew Operations Manual

DUCT OVERHEAT Light
Illuminated (amber) –
.
bleed air temperature in related duct exceeds limit

.
air mix valves drive full cold

.
requires reset.

Control (CONT) CABIN and Passenger (PASS) CABIN Temperature Selector
AUTO – automatic temperature controller controls passenger cabin or flight deck temperature as selected.
MANUAL – air mix valves controlled manually. Automatic temperature controller bypassed.

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 MIX VALVE Indicator
Indicates position of air mix valves:
.
controlled automatically with related temperature selector in AUTO

.
controlled manually with related temperature selector in MANUAL.

Air Temperature (TEMP) Indicator
Indicates temperature at location selected with AIR TEMP source selector.

Recirculation (RECIRC) FAN Switch
OFF - fan signalled off.
Copyright . The Boeing Company. See title page for details.
Air Systems -Controls and Indicators 737 Flight Crew Operations Manual

AUTO – fan signalled on except when both packs operating with either PACK switch in HIGH.

PACK TRIP OFF Light
Illuminated (amber) –
.
indicates pack temperature has exceeded limits

.
related pack valve automatically closes and mix valves drive full cold

.
requires reset.

TRIP RESET Switch
Push (if fault condition is corrected) –
.  
resets BLEED TRIP OFF, PACK TRIP OFF and DUCT OVERHEAT
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.
2.10.8   June 1, 2003

Air Systems -Controls and Indicators 737 Flight Crew Operations Manual
YC153 -YK104
YC411 -YK104

PACK 
WING-BODY OVERHEAT 
BLEED TRIP OFF 

PACK 
WING-BODY OVERHEAT 
BLEED TRIP OFF 

Copyright . The Boeing Company. See title page for details.
June 1, 2005  2.10.9

Air Systems -Controls and Indicators

YC153, YC154
PACK 
WING-BODY OVERHEAT 
BLEED TRIP OFF 

PACK 
WING-BODY OVERHEAT 
BLEED TRIP OFF 

Air Temperature (TEMP) Indicator
Indicates temperature at location selected with AIR TEMP source selector.
Copyright . The Boeing Company. See title page for details.
2.10.10  September 26, 2003

Air Systems -Controls and Indicators 737 Flight Crew Operations Manual

ZONE TEMP Lights
Illuminated (amber) –
.  
CONT CAB indicates a duct temperature overheat or failure of the flight deck primary and standby temperature control
　
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