Bleed Air Controls and Indicators
PACK TRIP OFF
OVERHEAT WING-BODY
TRIP OFF BLEED
DUAL BLEED Light
Illuminated (amber) – APU bleed air valve open and engine No. 1 BLEED air switch ON, or engine No. 2 BLEED air switch ON, APU bleed air valve and isolation valve open.
ISOLATION VALVE Switch
CLOSE – closes isolation valve.
AUTO –
. closes isolation valve if both engine BLEED air switches are ON and both air conditioning PACK switches are AUTO or HIGH
. opens isolation valve automatically if either engine BLEED air or air
conditioning PACK switch positioned OFF.
Air Systems -Controls and Indicators 737 Operations Manual
OPEN – opens isolation valve.
WING–BODY OVERHEAT Light
Illuminated (amber) –
.
left light indicates overheat from bleed air duct leak in left engine strut,
left inboard wing leading edge, left air conditioning bay, keel beam or
APU bleed air duct
.
right light indicates overheat from bleed air duct leak in right engine strut, right inboard wing leading edge or right air conditioning bay.
Engine BLEED Air Switches
OFF – closes engine bleed air valve.
ON – opens engine bleed air valve when engines are operating.
APU BLEED Air Switch
OFF – closes APU bleed air valve.
ON – opens APU bleed air valve when APU is operating.
Bleed Air DUCT PRESSURE Indicator
Indicates pressure in L and R (left and right) bleed air ducts.
Wing–Body Overheat (OVHT) TEST Switch
PUSH –
.
tests wing–body overheat detector circuits
.
illuminates both WING–BODY OVERHEAT lights.
BLEED TRIP OFF Light
Illuminated (amber) – excessive engine bleed air temperature or pressure
.
related engine bleed air valve closes automatically
.
requires reset.
TRIP RESET Switch
PUSH (if fault condition is corrected) –
.
resets BLEED TRIP OFF, PACK TRIP OFF and DUCT OVERHEAT
lights
.
lights remain illuminated until reset.
Copyright . The Boeing Company. See title page for details.
2.10.2 December 7, 2001
Air Systems -Controls and Indicators
Air Conditioning Controls and Indicators
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.
Copyright . The Boeing Company. See title page for details.
December 7, 2001 2.10.3
Air Systems -Controls and Indicators 737 Operations Manual
PASS CABIN – selects passenger cabin sensor for TEMP indicator.
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.
Copyright . The Boeing Company. See title page for details.
2.10.4 December 7, 2001
Air Systems -Controls and Indicators 737 Operations Manual
Recirculation (RECIRC) FAN Switch
OFF – fan signalled OFF
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