CLOSED
ANTI-ICE
PRECOOLER CONTROL VALVE
REVERSE FLOW SENSEOPEN DOWNSTREAM SENSE
LINE (TO BLEED AIRREGULATOR)CHECK VALVE LINE TO PRSOV
TOSTAGE5TH-USERSYSTEMS
490`F/254`CREVERSE450`F/232`C
OVERHEAT
PRECOOLER9TH-
THERMOSTATSTAGE FLOW SENSESWITCH LINE (TOHIGH-STAGEOVERBOARD
PRECOOLER CONTROLREGULATOR)
VALVE SENSOR(390-440`F/199-227`C)TOSTARTER
OPEN
CLOSED
HIGH-STAGE REGULATOR
(REMOTELY MOUNTED)
WATER
PRESSURIZATION
TAP
CLOSE OPEN

13
HIGH-STAGE
1 ENGINE NO. 1 ONLY2
NOT INSTALLED ON ALL AIRPLANES
OPEN
VALVE
3 AIRPLANES AFTER LINE NO. 1527 CLOSED
Engine Bleed Air Distribution System Control SchematicFigure 12 (Sheet 1)
C94153
A 737-300/400/500MAINTENANCE MANUAL
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH BLEED AIR REGULATOR ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
GROUND WTAILOW FLOWSOLENOID 2 BLEED AIR REGULATOR
(REMOTELY MOUNTED) CLOSE
OPEN
PRESSUREREGULATORTO NOSE
AND SHUTOFFCOWL THERMAL
VALVE
FAN

CLOSED
ANTI-ICE
PRECOOLER CONTROL VALVE
DOWNSTREAM SENSEOPEN
LINE TO PRSOVCHECK VALVE
TOSTAGE5TH-
USERSYSTEMS 490`F/254`CREVERSE FLOW 450`F/232`C
OVERHEAT
PRECOOLERSENSE LINE
9TH-
THERMOSTATSTAGE SWITCH (TO HIGH-STAGE OVERBOARD PRECOOLER CONTROLREGULATOR)
VALVE SENSOR(390-440`F/199-227`C)TOSTARTER
OPEN
CLOSED
HIGH-STAGE REGULATOR
WATER(REMOTELY MOUNTED)
PRESSURIZATION
TAP

13CLOSE OPEN1ENGINE NO. 1 ONLYHIGH-STAGE2
NOT INSTALLED ON ALL AIRPLANES
OPEN
VALVE
3 AIRPLANES AFTER LINE NO. 1527 CLOSED
Engine Bleed Air Distribution System Control SchematicFigure 12 (Sheet 2)
E64323
A 737-300/400/500MAINTENANCE MANUAL

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 ALL  ú ú 04 Page 28 ú Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 ENGINE BLEED AIR DISTRIBUTION SYSTEM - TROUBLE SHOOTING
_______________________________________________________
 1.  General
_______
 A.  Fault isolation for the engine bleed air distribution system uses these procedures and operations to isolate problems:
 -Fault report from flight crew
 -Operation of the system on the ground
 -System checks with or without the use of ground equipment.
 B.  It is necessary to use electrical and pneumatic power during fault isolation procedure.
 WARNING: YOU MUST RELEASE THE PRESSURE IN THE PNEUMATIC SYSTEM BEFORE
_______ MAINTENANCE OPERATIONS CAN OCCUR. THE HOT, HIGH PRESSURE AIR CAN CAUSE DAMAGE AND INJURY.
 2.  Pneumatic Bleed System References
_________________________________
 Figure 101 Engine Bleed Air Distribution System - Component Location. Figure 102 Duct Pressure vs N1 at Sea Level and 5000 Feet.
 WARNING: YOU MUST DISCONNECT THE POWER TO THE THRUST REVERSER BEFORE YOU DO WORK
_______ ADJACENT TO IT. OPERATION OF THE THRUST REVERSER DURING MAINTENANCE CAN CAUSE INJURY AND DAMAGE.
 3.  Fault Isolation Procedures
__________________________
 Figure 103 The "BLEED TRIP OFF" Light Was On. The Engine Was the
 Bleed Source. Figure 104 Low Duct Pressure. The Engine Was the Bleed Source. Figure 105 High Duct Pressure. The Engine Was the Bleed Source. Figure 106 Zero Duct Pressure. The BLEED TRIP OFF Light Did Not Come
 On. The Engine Was the Bleed Source. Figure 107 The Bleed Valve Will Not Close When the Bleed Switches Are Turned OFF. The Engine Was the Bleed Source. Figure 108 The Isolation Valve Does Not Open or Close Properly.
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