S 015-004
(3)
Open the fan cowl panels (AMM 71-11-02/201).
S 015-005
WARNING: OBEY THE INSTRUCTIONS IN THE PROCEDURE TO OPEN THE THRUST
_______ REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS, INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR.
(4) Open the thrust reversers (AMM 78-31-00/201).
F. Procedure
S 215-006
(1)
Examine the position indicator on the PRSOV.
S 715-007
(2)
Is the PRSOV in the fully closed position?
(a) No, use a wrench to open and close the PRSOV.
1) Does the PRSOV move to the open and closed positions smoothly? a) No, replace the PRSOV (AMM 36-11-15/401) b) Yes, continue.
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(b) Yes, continue.
S 865-035
(3) There are two methods you can use to electrically enable the bleed air regulator. Method 1 uses the airplane's own electrical power to put the applicable bleed switch to the ON position. Method 2 uses a separate 28 VDC power supply to enable the bleed air regulator if the bleed switch is in the OFF position. (a) With Method 1 (with the airplane's own electrical power), put the applicable engine bleed switch in the ON position (P5 panel). (b) With Method 2, do the steps that follow: 1) Remove the electrical connector from the bleed air regulator. 2) Apply 28 VDC to pins 5 and 6 of the bleed air regulator for approximately 5 seconds. a) You should hear the ON/OFF solenoid click at the bleed air regulator. b) Remove the 28 VDC power supply. c) Install the electrical connector back on the bleed air regulator.
S 035-039
(4) Disconnect the 5th-stage supply line at the tee for the supply line to the bleed air regulator.
S 485-036
(5) Connect a supply pressure gage (Ps) and nitrogen source to the supply pressure inlet line at the tee from the 5th stage duct (View A, Fig. 501).
S 035-018
(6) Disconnect the control pressure sense line at the tee on the PRSOV (View B, Fig. 501).
S 485-019
(7) Install a control pressure gage (Pc) to the control pressure line (View B, Fig. 501).
S 725-020
(8) Slowly increase Ps to 60-70 psig.
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SUPPLY LINE TO THE PRECOOLER CONTROL VALVE
SEE A
5TH-STAGE SUPPLY LINE
MS-6 (UNION)
SUPPLY LINE
TO THE BLEED
AIR REGULATOR
5TH-STAGE
CHECK VALVE
SUPPLY
PRESSURE
GAUGE (Ps)
TEST LINE 5TH-STAGE
DUCT
FWD
NITROGEN
PRESSURE
SUPPLY
REGULATOR
PRESSURE
A
Bleed Air Regulator and Pressure Regulating Shutoff Valve Test Equipment
Figure 501 (Sheet 1)
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A54870
A 737-300/400/500MAINTENANCE MANUAL
SEE B
PRECOOLER TO 450`F SENSE LINE THERMOSTAT
SUPPLY PRESSURE SENSE LINE TO BLEED AIR REGULATOR
CONTROL PRESSURE GAUGE (Pc)
