Air Supply Distribution System
Figure 1 (Sheet 1)
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C45368
DUAL RAM DOOR
RAM DOOR
BLEED
FULL OPENFULL OPEN
RECIRC FAN
OFF
AUTO
40 60
OVHT
80
PSI
0100
TEST
L PACK R PACK
ISOLATION
OFF VALVE OFF
AUTO CLOSE AUTO
HIGH AUTO HIGH
TO CABIN TEMPERATURE CONTROL VALVES ANDPACK
WING
WING
ANTI
PACK
OPEN ANTI
PRIMARY HEAT EXCHANGERS
TRIP OFF
TRIP OFF
ICE
ICE
WING-BODY
WING-BODY
OVERHEAT
TRIP
OVERHEAT
APU TRIP OFF BLEED
BLEED
TRIP OFF
RESET
OFF OFF APU BLEED
ON ON
1 APU2
AIR VALVEBLEED
PACK FLOW
AUTO
OFF SCHED
FAIL
TO LEFT TO TAT PROBE
STANDBY MANUAL
CONTROL AND
DESCENT
TURBOFAN (REF 34-12)
SHUTOFF VALVE
P5-10 AIR CONDITIONING MODULERELIEFVALVE
TO RIGHTGROUND WTAI
TURBOFAN SOLENOID VALVE
APU BLEED
AIR CHECK
PRECOOLER
VALVE
CONTROL
VALVE
LEFT TURBOFAN
FAN TO WING
RIGHT
CONTROL VALVETAI VALVE
TURBOFAN TO COWL
HYDRAULIC RESERVOIR
CONTROL TAI VALVE
PRESSURE TAP VALVE
PRECOOLER
BLEED AIR 490` F CONTROL PNEUMATIC
5TH-CHECK VALVE PRESSURE OVERHEATVALVE PRESSURE
POTABLE WATER TAP
STAGE
REGULATOR AND SWITCH SENSOR
TRANSMITTER
SHUTOFF VALVE
PRE-
9TH-
450` F
BLEED AIR
STAGE
COOLER
THERMOSTAT
ISOLATION
VALVE
BLEED AIR
HIGH-STAGE
REGULATOR ENGINE 1
REGULATOR ENGINESTART TO POTABLEHIGH-STAGE ENGINE SYSTEM
WATER SYSTEM VALVE
CORE
1
CAVITY LEGEND HOT BLEED AIR
COLD AIR
DISCHARGE AIR
AIRPLANES AFTER LINE NO. 1527 PRECOOLED AIR
1
Air Supply Distribution SystemFigure 1 (Sheet 2)
PACK FLOW
CONTROL AND
SHUTOFF VALVE
TO WING
TAI VALVE
PRECOOLER
PNEUMATIC CONTROL 490` F
PRESSURE VALVE OVERHEAT
TRANSMITTER SENSOR SWITCH
PRE-
450` F
COOLER
THERMOSTAT
GROUNDPNEUMATICCONNECTION ENGINE
HYDRAULICSTARTSYSTEM
ENGINE
RESERVOIR
CORE
PRESSURE
CAVITY
TAP
GROUND WTAISOLENOID VALVE PRECOOLERCONTROLVALVE
FANTO COWLTAI VALVE
BLEED AIR
PRESSURE CHECK VALVE
5TH-REGULATOR AND
STAGESHUTOFF VALVE
9TH-STAGEBLEED AIR
REGULATOR HIGH-STAGEREGULATOR ENGINE 2HIGH-STAGE
VALVE
A 737-300/400/500MAINTENANCE MANUAL
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A
737-300/400/500MAINTENANCE MANUAL
PNEUMATIC SYSTEM - MAINTENANCE PRACTICES (PRESSURIZE/DEPRESSURIZE
_________________________________________________________________ PNEUMATIC SYSTEM)
_________________
1. General_______
A. This procedure contains four tasks. The first task uses a ground air source to pressurize the pneumatic system. The second task uses the auxiliary power unit (APU) to pressurize the pneumatic system. The third task uses the engines to pressurize the pneumatic system. The fourth task removes the pressure from the pneumatic system.
B. You must supply pressure to the pneumatic system before you can operate an air-driven system or component.
TASK 36-05-00-862-001
2. Use a Ground Air Source to Pressurize the Pneumatic System__________________________________________________________
A. Equipment
(1)
A ground source which can supply clean air at the correct pressure and flow values. It must have a connection which will mate with the ground pneumatic service connector on the airplane.
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