Air Systems -Table of Contents
737 Flight Crew Operations Manual
Pressurization Outflow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.40.2 Outflow Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.40.3 Overboard Exhaust Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.40.3 Pressurization Outflow Schematic . . . . . . . . . . . . . . . . . . . . . 2.40.4 Auto Mode Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.40.5 Flight Path Events – Auto Mode . . . . . . . . . . . . . . . . . . . . . . 2.40.7 Manual Mode Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.40.8
Copyright . The Boeing Company. See title page for details.
March 29, 2004 2.TOC.0.3
Air Systems -Table of Contents 737 Flight Crew Operations Manual
Intentionally
Blank
Copyright . The Boeing Company. See title page for details.
2.TOC.0.4 March 29, 2004
Bleed Air Controls and Indicators
YA613 - 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.
June 1, 2003 2.10.1
Air Systems -Controls and Indicators
YC153 -YK104
PACK
WING-BODY OVERHEAT
BLEED TRIP OFF
PACK
WING-BODY OVERHEAT
BLEED TRIP OFF
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.
OPEN – opens isolation valve.
Copyright . The Boeing Company. See title page for details.
2.10.2 September 26, 2003
Air Systems -Controls and Indicators 737 Flight Crew Operations Manual
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 YA613 - YA809
Push (if fault condition is corrected) –
.
resets BLEED TRIP OFF, PACK TRIP OFF and DUCT OVERHEAT
lights
.
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.
Air Systems -Controls and Indicators 737 Flight Crew Operations Manual
TRIP RESET Switch
YC153 - YK104
Push (if fault condition is corrected) –
.
resets BLEED TRIP OFF, PACK and ZONE TEMP lights
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