S 865-146
 (3) Put the switch for the isolation valve to the CLOSE position.
 (a)  Make sure the isolation valve moves to the CLOSED position.
 S 865-151
 (4) Put the switch for the isolation valve to the OPEN position.
 (a)  Make sure the isolation valve moves to the OPEN position.
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737-300/400/500MAINTENANCE MANUAL
 F. Put The Airplane Back To Its Usual Condition
 S 415-035
 (1)
Close the access panels for the air conditioning equipment bay.

 S 865-036

 (2)  
Remove the electrical power if it is not necessary (AMM 24-22-00/201).

 TASK 36-11-05-715-037
 4.  Wing-to-Body Overheat Operational Test______________________________________
 A. General
 (1)  This procedure does the operational test of the overheat detection system for the wing-to-body.
 B. References
 (1)  AMM 24-22-00/201, Manual Control
 C. Prepare To Do the Operational Test
 S 865-038
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 865-039

 (2)  
Push and hold the OVHT TEST switch on the P5-10 panel.

 S 215-082

 (3)  
Make sure these lights come ON:

 (a)  
The MASTER CAUTION (2 Locations) on the P7 glare shield.

 (b)  
The AIR COND annunciator on the P7 glare shield.

 (c)  
The L WING-TO-BODY OVERHEAT on the P5-10 panel.

 (d)  
The R WING-TO-BODY OVERHEAT on the P5-10 panel.

 S 215-083
 (4)  Make sure these lights do not come on:
 (a)  
The L BLEED TRIP OFF light on the P5 panel.

 (b)  
The R BLEED TRIP OFF light on the P5 panel.

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737-300/400/500MAINTENANCE MANUAL
 S 865-040
 (5)  Push and release one of the two MASTER CAUTION lights.
 (a)  Make sure these light go off:
 1) The AIR COND annunciator.
 2) The MASTER CAUTION light.

 S 865-041
 (6)  Release the OVHT TEST switch.
 (a)  Make sure these lights go off:
 1) The L WING-BODY OVERHEAT light.
 2) The R WING-BODY OVERHEAT light.

 D. Put the Airplane Back To Its Usual Condition
 S 865-152
 (1)  Remove the electrical power if it is not necessary
 (AMM 24-22-00/201).

 TASK 36-11-05-715-043
 5.  Bleed Air Control System Operational Test - Engine (Fig. 503)__________________________________________________
 A. General
 (1)  
This procedure does the operational test of the control system for the engine bleed air. It uses the components that follow:

 (a)  
The high stage valve

 (b)  
The high stage regulator

 (c)  
The pressure regulating and shutoff valve (PRSOV)

 (d)  
The bleed air regulator.

 (2)  
This procedure examines the operation of the PRSOV and the crossover between the 9th and 5th stage bleed.

 B. References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 71-00-00/201, Power Plant

 C. Prepare For The Operational Test
 S 215-044
 (1)  Examine the oil levels of the Turbofans and the Air Cycle Machines.
 (a)  Make sure the oil levels are 3/4 of the distance to the top of their sight glasses.
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