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737-300/400/500MAINTENANCE MANUAL
 S 865-019
 (13) Push and release the TRIP RESET switch on the P5-10 panel.
 (a)  Make sure these steps occur:
 1)  The bleed air regulator solenoid air goes to the ON position.
 NOTE: The movement of the solenoid will make a click.
____
 2) The MASTER CAUTION lights go off.
 3) The AIR COND annunciator light goes off.
 4) The left (right) BLEED TRIP OFF light goes off.

 S 435-015
 (14)
 Install the bleed air overheat switch (AMM 36-11-71/401).

 S 865-147

 (15)
 Put the ENGINE 1 FIRE (ENGINE 2 FIRE) switch, on the P8 panel, to the ON position.

 (a)  Make sure the left (right) bleed air regulator solenoid goes to the OFF position.
 S 865-020
 (16) Put the ENGINE 1 FIRE (ENGINE 2 FIRE) switch to the NORMAL position.
 (a)  Make sure the left (right) bleed air regulator solenoid goes to the ON position.
 S 865-022
 (17) Put the BLEED 1 (BLEED 2) switch, on the P5-10 panel, to the OFF position.
 (a) Make sure the regulator solenoid goes to the OFF position.
 G.  Put The Airplane Back To Its Usual Condition
 S 415-024
 WARNING: OBEY THE INSTRUCTIONS IN THE PROCEDURE TO CLOSE THE THRUST
_______ REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS WHEN YOU CLOSE THE THRUST REVERSERS, INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
 (1)  Close the thrust reversers (AMM 78-31-00/201).
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A 737-300/400/500MAINTENANCE MANUAL
 S 415-014
 (2)  
Close the fan cowl panels (AMM 71-11-02/201).

 S 865-026

 (3)  
Remove the electrical power if it is not necessary
 (AMM 24-22-00/201).

 S 095-027

 (4)  
Remove the DO-NOT-OPERATE tags.

 TASK 36-11-05-715-028
 3. Bleed Air Isolation Valve Operational Test
__________________________________________
 A. General
 (1)  This procedure does the operational test for the bleed air isolation valve. It examines the position of the isolation valve in relation to the position of the PACK switch and the BLEED switch.
 B. References
 (1)  
AMM 12-31-01/201, Zone Diagrams

 (2)  
AMM 12-31-31/201, Body Section 46 Access Doors and Panels

 (3)  
AMM 24-22-00/201, Manual Control

 C. Access
 (1)  
Location Zones (AMM 12-31-01/201)
 212 Left Air Conditioning Equipment Bay
 214 Right Air Conditioning Equipment Bay

 (2)  
Access Panels (AMM 12-31-31/201)
 3303 Left Air Conditioning Access Panel
 3403 Right Air Conditioning Access Panel

 

 D. Prepare To Do the Operational Test for the Isolation Valve
 S 865-148
 (1)  
Supply electrical power (AMM 24-22-00/201).

 (2)
Open the access panels for the air conditioning equipment bay.

 S 015-030
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A
737-300/400/500MAINTENANCE MANUAL
 E. Do the Operational Test
 S 865-149
 (1)  
Put the ISOLATION VALVE switch, on the P5-10 panel, to the AUTO position.

 S 865-150

 (2)  
Put the PACK switch and the BLEED switch to the position shown in the table that follows:

 (a)  Make sure the isolation valve is in the position shown in the table.
 PACK SWITCH___________ BLEED SWITCH____________ ISOLATION VALVE POSITION________ POSITION________ POSITION
 L-R AUTO 1-2 ON  CLOSED
 L OFF - R AUTO 1-2 ON  OPEN
 L AUTO - R OFF 1-2 ON  OPEN
 L-R AUTO 1 ON - 2 OFF OPEN L-R AUTO 1 OFF - 2 ON OPEN L-R OFF 1-2 OFF OPEN L-R HIGH 1-2 ON CLOSED
　
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