36-11-05
 ALL  ú
 ú  02  Page 147
 ú  Nov 12/01 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
G61130
A
737-300/400/500MAINTENANCE MANUAL
FROM SHEET 1 (BLOCK 1)
NO NO

2 REMOVE THE PNEUMATIC PRES-
43 REPLACE THE PRECOOLER
SURE FROM THE SYSTEM CONTROL VALVE (AMM 36-12-35/
(AMM 36-05-00/201). 401).

NOTE:  A PRECOOLER CONTROL VALVE THAT WILL NOT MODULATE CORRECTLY CAN CAUSE A SPLIT DUCTPRESSURE CONDITION.
OPEN THE FAN COWL PANELS AND THRUST REVERSER PANELS (AMM 71-11-02/201).
 USE A MIRROR TO EXAMINE THE POSITION INDICATOR ON THE PRECOOLER CONTROL VALVE. THE POSITION INDICATOR IS ON TOP OF THE VALVE.
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
NO

3 CONNECT A SUPPLY PRESSURE
44 DECREASE THE SUPPLY
GAUGE (Ps), PRESSURE REGULA-PRESSURE (Ps) TO ZERO.
TOR, AND NITROGEN BOTTLE TO REPLACE THE PRECOOLER
THE SUPPLY PRESSURE INLET LINE CONTROL VALVE (AMM 36-12-35/
AT THE TEE FROM THE 5TH-STAGE 401).
DUCT (SEE SHEET 5).

INSTALL A CONTROL PRESSURE GAUGE (Pc) AND A NEEDLE VALVE TO THE CONTROL LINE PORT OFTHE PRECOOLER CONTROL VALVE SENSOR (SEE SHEET 6).
WITH THE NEEDLE VALVE CLOSED, SLOWLY INCREASE Ps TO 50-60 PSIG.
IS Pc BELOW 11 PSIG?
YES NO
4 SLOWLY OPEN THE NEEDLE45 DECREASE THE SUPPLY
VALVE AND REDUCE Pc TO 3 PSI. PRESSURE (Ps) TO ZERO.

 DID THE PRECOOLER CONTROL REPLACE THE PRECOOLER VALVE GO TO THE FULLY OPENCONTROL VALVE (AMM 36-12-35/ POSITION? 401) AND THE PRECOOLER CONTROL

VALVE SENSOR (AMM 36-12-45/ YES 401).
SEE SHEET 3
(BLOCK 5)

Split Duct Pressure. The Engine Was the Bleed Source.
Figure 109 (Sheet 2)

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 36-11-05
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 ú  02  Page 148
 ú  Nov 15/97 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
G60912
A

737-300/400/500
MAINTENANCE MANUAL

FROM SHEET 2
(BLOCK 4)
YES

NO
5
DECREASE THE SUPPLY
PRESSURE (Ps) TO ZERO.

 REMOVE THE CONTROL PRES-SURE GAUGE (Pc) AND THE NEEDLE VALVE FROM THE CONTROL LINE PORT OF THE PRECOOLER CONTROL VALVE AND RECONNECT THE SENSE LINE.
KEEP THE SUPPLY PRESSUREGAUGE (Ps), PRESSURE REGULA-TOR, AND NITROGEN BOTTLE CONNECTED AT THE TEE FOR THE 5TH-STAGE DUCT.
EXAMINE THE POSITION INDICATOR ON THE PRSOV. IS THE VALVE IN THE FULLY CLOSED POSITION?

YES NO

6 USE A WRENCH TO OPEN AND
CLOSE THE PRSOV.

 DOES THE PRSOV MOVE TO THE OPEN AND CLOSED POSITIONS SMOOTHLY?

YES YES
7 PUT THE BLEED SWITCH TO

THE ON POSITION (P5 PANEL). INCREASE Ps TO 70 PSIG. EXAMINE THESE SENSE LINES
FOR LEAKAGE: . SENSE LINE FROM THE BAR TO THE PRSOV (SEE SHEET 7)
. SENSE LINE FROM THE PRSOV TO THE 450`F THERMOSTAT(SEE SHEET 7).
IS THERE ANY LEAKAGE?

NO NO YES

8 DECREASE THE SUPPLY
22 DECREASE Ps TO ZERO.
PRESSURE Ps TO ZERO. DISCONNECT AND CAP THE

REMOVE THE CONTROL PRES-SENSE LINE PORT ON THE PRSOVSURE SENSE LINE AT THE TEE ON THAT LEADS TO THE 450`FTHE PRSOV. INSTALL A CONTROL THERMOSTAT (SEE SHEET 10, PRESSURE (Pc) GAUGE AT THE TEE VIEW F). (SEE SHEET 7). INCREASE Ps TO 60-70 PSIG

INCREASE Ps TO 60-70 PSIG. IS Pc ABOVE 20 PSIG?
IS Pc ABOVE 20 PSIG?

NO YES

SEE SHEET 4 SEE SHEET 4 (BLOCK 23) (BLOCK 52)

Split Duct Pressure. The Engine Was the Bleed Source.
Figure 109 (Sheet 3)

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 36-11-05
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 ú  02  Page 149
 ú  Nov 15/97 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
G60914
A 737-300/400/500MAINTENANCE MANUAL
FROM SHEET 3 FROM SHEET 3 (BLOCK 8) (BLOCK 22)
YES

NO YES

23 DECREASE Ps TO ZERO. RECONNECT THE 450`F SENSE REPLACE THE PRSOV LINE.(AMM 36-11-15/401).
DISCONNECT THE CONTROL PRESSURE SENSE LINE TO THE PRSOV AT THE TEE AND INSTALL A CAP ON THE SENSE LINE (SEESHEET 10, VIEW G).
　
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