A99799
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A 737-300/400/500MAINTENANCE MANUAL
SEE D
PRECOOLER SUPPLY PRESSURE SENSE LINE TO BLEED AIR REGULATOR TO 450`F SENSE LINE THERMOSTAT
CONTROL PRESSURE GAUGE (Pc)
PRSOV
TEST LINE MS-6 (UNION) MS-6 (UNION)
CONTROL PRESSURE SENSE LINE FROM BLEED AIR REGULATOR
D
High Duct Pressure. The Engine Was the Bleed Source. Figure 105 (Sheet 5)
C43836
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
PREREQUISITES
MAKE SURE THESE CIRCUIT BREAKERS ARE CLOSED (P6-4): B1,B2,B3,D1,D2,D3,D4
MAKE SURE THE AIRPLANE IS IN THIS CONFIGURATION: ELECTRICAL POWER IS ON (AMM 24-22-00/201) NO PRESSURE IN THE PNEUMATIC SYSTEM (AMM 36-00-00/
201) APPLICABLE ENGINE BLEED SWITCH (P5 PANEL) IN THE OFF POSITION
EQUIPMENT: 0-200 PSIG GAS SOURCE (NITROGEN BOTTLE) PRESSURE GAUGES (2 REQUIRED) MS-6 UNION FITTINGS (3 REQUIRED) NEEDLE VALVE CAP
ZERO DUCT PRESSURE.
____. ZERO DUCT PRESSURE CAN BE CAUSED BY A PROBLEM
NOTE:
THE BLEED TRIP OFF
WITH ONE OF THESE ITEMS:
LIGHT DID NOT COME
-PRESSURE INDICATION SYSTEM ON. THE ENGINE WAS
-PRSOV OR BLEED AIR REGULATOR (BAR)THE BLEED SOURCE. - LEAKY SENSE LINES.
YES YES
1 ____NOTE: A PROBLEM WITH THE
21 REMOVE THE PNEUMATIC
41 REMOVE THE PNEUMATIC DUCT PRESSURE PRESSURE FROM THE SYSTEM PRESSURE FROM THE SYSTEM TRANSMITTER OR (AMM 36-05-00/201). (AMM 36-05-00/201). INDICATOR CAN CAUSE REPLACE THE DUCT PRESSURE REPLACE THE DUCT PRESSURE A ZERO DUCT PRES-TRANSMITTER ON THE AFFECTEDINDICATOR ON THE P5 PANEL.SURE CONDITION. SIDE (AMM 36-21-11/401).
SUPPLY PNEUMATIC PRESSURENOTE: MAKE SURE THE AMBIENT
WITH THE APU OR GROUND AIR VENT ON THE DUCT PRES-
SOURCE (AMM 36-05-00/201). SURE TRANSMITTER IS NOT PUT THE ISOLATION VALVE TO CAPPED.
THE OPEN POSITION ON THE P5
SUPPLY PNEUMATIC PRESSURE
PANEL (SEE SHEET 4, VIEW A).
WITH THE APU OR GROUND AIR
IS THE DUCT PRESSURE ON
SOURCE WITH THE ISOLATION
ONE SIDE AT ZERO?
VALVE OPENED.
NO
DOES THE ZERO DUCT PRES-SURE CONDITION STILL OCCUR?
SEE SHEET 2
NO
(BLOCK 2)
42 REMOVE THE PNEUMATIC PRESSURE FROM THE SYSTEM (AMM 36-05-00/201).
CONTINUE THE AIRPLANE IN SERVICE.
Zero Duct Pressure. The BLEED TRIP OFF Light Did Not Come On.
The Engine Was the Bleed Source.
Figure 106 (Sheet 1)
B04135
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ú 02 Page 134
ú Nov 15/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500
MAINTENANCE MANUAL
FROM SHEET 1 (BLOCK 1)
NO
NO
2
____A DEFECTIVE PRSOV
NOTE:
OR BLEED AIR REGU-LATOR CAN CAUSE A
ZERO DUCT PRESSURE
CONDITION.
REMOVE THE PNEUMATIC PRESSURE FROM THE SYSTEM(AMM 36-05-00/201).
EXAMINE THE POSITION INDICATOR ON THE PRSOV (SEESHEET 4, VIEW B).
IS THE PRSOV IN THE FULLY CLOSED POSITION?
YES
NO
3 USE A WRENCH TO OPEN AND
CLOSE THE PRSOV.
DOES THE PRSOV MOVE TO THE OPEN AND CLOSE POSITIONS SMOOTHLY?
YES YES
4 CONNECT A SUPPLY PRESSURE
GAUGE (Ps), PRESSURE REGULA-TOR, AND NITROGEN BOTTLE TO
THE SUPPLY PRESSURE INLET LINE
AT THE TEE FROM THE 5TH-STAGE
DUCT (SEE SHEET 5).
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