____ A HIGH-STAGE VALVE
45 REMOVE THE PRESSURE FROM
DID THE BLEED TRIP OFF LIGHT COME ON DURING A NOBLEEDS TAKEOFF?

NO SEE SHEET 3
(BLOCK 4)

The BLEED TRIP OFF Light Was On. The Engine Was the Bleed Source. Figure 103 (Sheet 2)
A48002
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
FROM SHEET 2
(BLOCK 3)
NO NO

4 DECREASE Ps TO ZERO. USE
46 REMOVE THE PRESSURE FROM
A MIRROR TO EXAMINE THE POSI-THE SYSTEM.
TION INDICATOR ON THE PRE-REPLACE THE PRECOOLER CON-COOLER CONTROL VALVE. THE TROL VALVE (AMM 36-12-35/401).
POSITION INDICATOR IS ON TOP
OF THE VALVE (SEE SHEET 5).

NOTE:  A PROBLEM WITH THE PRE-COOLER CONTROL VALVE CAN CAUSE THE ACTIVA-TION OF THE ENGINE BLEED AIR OVERHEAT SWITCH (490`F).
 IS THE VALVE IN THE FULL OPEN POSITION?
NOTE:  ON VALVE WITH MANUAL WRENCHING DRIVE, USE A WRENCH TO OPEN AND CLOSE THE VALVE TO MAKE SURE THAT IT IS NOT STUCK.

YES YES

5 KEEP THE PRESSURE GAUGE
47 REMOVE THE PRESSURE FROM
(0-200 PSIG)(Ps), PRESSURE THE SYSTEM.
REGULATOR AND NITROGEN BOTTLE REPLACE THE PRECOOLER CON-CONNECTED TO THE INLET OF THE TROL VALVE (AMM 36-12-35/401).
TEE (SEE SHEET 7).

 DISCONNECT THE CONTROL PRESSURE LINE TO THE PRECOOLER CONTROL VALVE SENSOR AT THE PRECOOLER CONTROL VALVE. INSTALL A PRESSURE GAUGE (Pc) AND A NEEDLE VALVE TO THE PRECOOLER CONTROL VALVE (SEE SHEET 8).
WITH THE NEEDLE VALVE IN THE CLOSED POSITION, SLOWLYINCREASE Ps TO 50-60 PSIG (SEE SHEET 7).
NOTE:  HIGH REGULATION PRES-SURE CAN PREVENT THE PRECOOLER CONTROL VALVE FROM MODULATING TO ITS CORRECT POSITION.
IS Pc GREATER THAN 10 PSIG?

NO SEE SHEET 4
(BLOCK 6)

The BLEED TRIP OFF Light Was On. The Engine Was the Bleed Source.
Figure 103 (Sheet 3)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A48015
A 737-300/400/500MAINTENANCE MANUAL
FROM SHEET 3 (BLOCK 5)

NO

YES
6
WITH Ps ADJUSTED TO
60 PSIG, SLOWLY OPEN THE
NEEDLE VALVE AND REDUCE Pc
UNTIL THE PRECOOLER CONTROL
VALVE GOES TO THE FULL OPEN
POSITION.

 IS Pc LESS THAN 3 PSIG WHEN THE PRECOOLER CONTROL VALVE GOES TO THE FULL OPEN POSITION?

48 REMOVE THE PRESSURE FROM THE SYSTEM.
 REPLACE THE PRECOOLER CONTROL VALVE (AMM 36-12-35/ 401).

THE SYSTEM.
 THE COMPONENTS LISTED BELOW CAN CAUSE THE BLEED TRIP OFF LIGHT TO COME ON. HOW-EVER, YOU CANNOT DO ON-WING TROUBLESHOOTING OF THESE COM-PONENTS. YOU SHOULD REPLACE THESE COMPONENTS IN THE ORDER SHOWN UNTIL YOU CORRECT THE PROBLEM.
. HIGH-STAGE VALVE . PRECOOLER CONTROL VALVE
SENSOR . 450`F THERMOSTAT . ENGINE BLEED AIR OVERHEAT
SWITCH (490`F) . PRECOOLER.
The BLEED TRIP OFF Light was On. The Engine was the Bleed Source. Figure 103 (Sheet 4)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A48041
A 737-300/400/500MAINTENANCE MANUAL
SEE  A  RECIRC FAN OVHT OFF FULL OPEN RAM DOORRAM DOOR FULL OPENBLEED DUAL AUTO HIGH AUTOAUTO L PACK AUTO CLOSE VALVE ISOLATION R PACK TEST OFF 100 80 6040 PSI HIGH OFF 0 
FLIGHT COMPARTMENT  WING-BODY OFF BLEED ON ICE APU OFF AUTO STANDBY TRIP OFF OPEN MANUAL TRIP ICE ANTI WING ANTI BLEED OVERHEAT WING-BODY TRIP OFF PACK TRIP OFF BLEED 2 OVERHEAT TRIP OFF PACK 1 ON DESCENTFAIL RESET WING OFF SCHED BLEED TRIP OFF LIGHT 
BUTTON TRIP RESET 
A 
SEE  B 
1 MANUAL WRENCHING DRIVE 
POSITION INDICATOR 
　
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