PRSOV
MS-6 (UNION) MS-6 (UNION)TEST LINE
CONTROL PRESSURE SENSE LINE FROM BLEED AIR REGULATOR
B

Bleed Air Regulator and Pressure Regulating Shutoff Valve Test Equipment
Figure 501 (Sheet 2)

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C43848
A 737-300/400/500MAINTENANCE MANUAL
SEEC D
PRSOV
SENSE LINE TO 450`F THERMOSTAT
FWD
CAP
C
PRSOV
FWD
CAP CONTROL PRESSURE SENSE LINE FROM BLEED AIR REGULATOR
D
Bleed Air Regulator and Pressure Regulating Shutoff Valve Test EquipmentFigure 501 (Sheet 3)
C44698
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A 737-300/400/500MAINTENANCE MANUAL
 S 795-021
 (9) Is Pc between 20 and 28 psig?
 (a) No, was control pressure above or below the given range?
 1)  Below, do the steps that follow to examine these areas for leakage: a) Sense line to the BAR. b) Sense line from the BAR to the PRSOV. c) Sense line from PRSOV to 450°F sensor. d) 450°F sensor. e) Repair all leakage found.
 NOTE: You may hear nitrogen leakage from the BAR.
____ This is from honest orifices on the BAR and is not abnormal.
 f)  If no leakage was found, install a cap at the port on the PRSOV that goes to the 450°F sensor (View C, Fig. 501) and do a check of the control pressure again.
 g)  Is Pc between 20 and 28 psig?
 1.  
Yes, replace the 450°F sensor (AMM 36-12-55/401).

_

 2.  
No, remove the cap installed at the port on the

_ PRSOV. Reconnect the sense line to the 450°F sensor on to the port on the PRSOV. Then, do as follows:
 -Disconnect the control pressure sense line at the tee on the PRSOV and install a cap on the sense line to isolate the BAR from the system (View D, Fig. 501).
 -Do a check of the control pressure again.  If Pc is between 20 and 28 psig, replace the PRSOV (AMM 36-11-15/401). If Pc is not between 20 and 28 psig, replace the BAR (AMM 36-11-16/401).
 2)  Above, replace the bleed air regulator (AMM 36-11-16/401).
 (b) Yes, continue.
 S 865-022
 (10)
 Decrease Ps to 0 psig.

 (11)
 Slowly increase Ps until the PRSOV goes to the fully open position.

 S 725-024

 (12)
 Was Ps less than 5 psig when the PRSOV was at the fully open position?

 (a)
No, replace the PRSOV (AMM 36-11-15/401).

 (b)
Yes, continue.

 S 715-023
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A
737-300/400/500MAINTENANCE MANUAL
 S 865-037
 (13) If the airplane's own electrical power is available, do the steps that follow:
 (a)  
AIRPLANES WITH BLEED AIR REGULATORS WITH PART NUMBERS 10-62008-23 OR 10-62008-37; Slowly increase the supply pressure (Ps) to 170-190 psig.

 (b)  
AIRPLANES WITH BLEED AIR REGULATORS WITH PART NUMBERS 10-62008-40; Slowly increase the supply pressure (Ps) to 210-230 psig.

 (c)  
Did the control pressure (Pc) go to less than 6 psig? 1) No, replace the bleed air regulator (AMM 36-11-16/401). 2) Yes, continue.

 (d)  
Decrease Ps to 0 psig.

 S 085-028
 (14)
 Remove the nitrogen source, supply and control pressure gages and test hoses.

 S 865-033

 (15)
 Push the trip reset switch on the P5 panel to put the bleed system to its usual condition.

 G. Put the Airplane Back to Its Usual Condition
　
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