____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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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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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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A 737-300/400/500MAINTENANCE MANUAL
SUPPLY LINE TO THE PRECOOLER CONTROL VALVE
5TH-STAGE SEE C SUPPLY LINE
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