.
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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