____A LEAKY SENSE LINE CAN
NOTE: CAUSE ZERO DUCT PRES-SURE.
INCREASE Ps TO 60-70 PSIG.
EXAMINE THESE ITEMS FOR LEAKAGE:. THE SENSE LINE FROM THE
BLEED AIR REGULATOR TO THE
PRSOV

.  THE SENSE LINE FROM THE PRSOV TO THE 450`F THERMOSTAT
. 450`F THERMOSTAT.
IS THERE ANY LEAKAGE?

NO
SEE SHEET 3 (BLOCK 5)

Zero Duct Pressure. The BLEED TRIP OFF Light Did Not Come On.
The Engine Was the Bleed Source.
Figure 106 (Sheet 2)

B04192
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 4)
NO NO YES
5 ____A BLEED AIR REGULA-
22 DISCONNECT CONNECTOR D3064
NOTE: TOR THAT SUPPLIES FROM THE BLEED AIR REGULATOR. LOW CONTROL PRES-MEASURE THE VOLTAGE FROM SURE CAN CAUSE THE PIN 5 TO PIN 6 ON CONNECTORDUCT PRESSURE TO BE D3064. ZERO. IS THERE 28V DC?
REMOVE THE CONTROL PRES-SURE LINE AT THE TEE ON THE
PRSOV (SEE SHEET 6).

INSTALL A CONTROL PRESSURE
GAUGE (Pc) AT THE TEE (SEE
SHEET 6).

PUT THE BLEED SWITCH TO
THE ON POSITION (P5 PANEL).
 INCREASE Ps TO 60-70 PSIG.
 IS Pc ABOVE 4 PSIG?

EXAMINE THE CIRCUIT THAT SWITCHES THE BLEED SYSTEM ON/OFF AS NECESSARY (WDM 36-10-01).
 REPAIR THE PROBLEMS THAT YOU FIND.

YESDECREASE Ps TO ZERO.
DISCONNECT THE SENSE LINE TO THE 450`F THERMOSTAT AT THE PRSOV.
INSTALL A CAP AT THE PORT ON THE PRSOV THAT GOES TO THE 450`F THERMOSTAT (SEESHEET 7, VIEW E).
SLOWLY INCREASE Ps TO 60-70 PSIG.
IS Pc ABOVE 20 PSIG?

NO
YES
24 DECREASE Ps TO ZERO.
 RECONNECT THE 450`F SENSE LINE.
 DISCONNECT THE CONTROL PRESSURE SENSE LINE TO THEPRSOV AT THE TEE AND INSTALL A CAP ON THE SENSE LINE (SEE SHEET 7, VIEW F).

INCREASE Ps TO 60-70 PSIG.
IS Pc ABOVE 20 PSIG?
NO 23

Zero Duct Pressure. The BLEED TRIP OFF Light Did Not Come On.
The Engine Was the Bleed Source.
Figure 106 (Sheet 3)

C45361
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

737-300/400/500
MAINTENANCE MANUAL

DUCT PRESSURE INDICATOR  DUAL BLEED FULL OPEN RAM DOOR  OFF RAM DOOR FULL OPEN RECIRC FAN 
SEE  A  AUTO 
40  60 80  OVHT 
0 PSI 100  TEST 
BLEED AIR ISOLATION VALVE  OFF HIGH L PACK AUTO  ISOLATION VALVE CLOSE AUTO  R PACK AUTO HIGH OFF 
WING ANTI ICE  PACK TRIP OFF OVERHEAT BLEED TRIP OFF OFF WING-BODY  RESET TRIP OPEN  PACK TRIP OFF WING-BODY OVERHEAT BLEED TRIP OFF OFF  WING ANTI ICE  OFF LIGHT BLEED TRIP 
FLIGHT COMPARTMENT  1  ON  APU BLEED  ON  2 
FAIL AUTO OFF SCHED DESCENT STANDBY  MANUAL 
TRIP RESET 
BUTTON 
A 

CONTROL 
PRESSURE 
PRESSURE REGULATING 
AND SHUTOFF VALVE  TO THERMOSTAT 
(PRSOV) 
SEE  B 
PRESSURE REGULATION 
AND SHUTOFF VALVE 
(PRSOV) 

DOWNSTREAM SENSE LINE TO THE PRECOOLER
MANUAL CONTROL AND INDICATION
B
Zero Duct Pressure. The BLEED TRIP OFF Light Did Not Come On.
The Engine Was the Bleed Source.
Figure 106 (Sheet 4)

A99828
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 ALL  ú ú 02 Page 137 ú Nov 15/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
SUPPLY LINE TO THE PRECOOLER CONTROL VALVE
5TH-STAGE SEE C SUPPLY LINE
　
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