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737-300/400/500MAINTENANCE MANUAL
 (b)  Concentration leakage must be repaired.
 NOTE: Concentration leakage is leakage which you can feel
____ with your hand at a distance of 12 inches.
 S 795-129
 (7) Do a test of the pneumatic ducts downstream of the crossover duct:
 (a)  
Put the L PACK switch to the AUTO position.

 (b)  
Examine the ducts downstream of the crossover ducts. 1) Diffused leakage is permitted. 2) Concentration leakage must be repaired.

 NOTE: Concentration leakage is leakage which you can feel
____ with your hand at a distance of 12 inches.
 (c)  
Put the L PACK switch to the OFF position.

 (d)  
Put the R PACK switch to the AUTO position.

 (e)  
Examine the pneumatic ducts downstream of the crossover duct. 1) Diffused leakage is permitted. 2) Concentration leakage must be repaired.

 NOTE: Concentration leakage is leakage which you can feel
____ with your hand at a distance of 12 inches.
 (f)  Put the R PACK switch to the OFF position.
 S 865-072
 (8)  
Put the 1 BLEED switch to the OFF position.

 S 865-166

 (9)  
Put the 2 BLEED switch to the OFF position.

 G. Put The Airplane Back To Its Usual Condition
 S 865-120
 (1) Remove the pressure from the pneumatic system (AMM 36-05-00/201).
 (a)  Make sure the pressure gage on the P5-10 panel shows 0.0 psig.
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737-300/400/500MAINTENANCE MANUAL
 S 865-121
 (2)  
Disconnect the air source from the air supply ground connect.

 S 985-172

 (3)  
Put the high stage valve on each engine back to its normal position.

 S 415-132
 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.
 (4)  
Close the thrust reverser (AMM 78-31-00/201).

 S 415-133

 (5)  
Close the fan cowl panels (AMM 71-11-02/201).

 S 415-008

 (6)  
Close the removable slat access panels, 6307L and 6407R (AMM 12-30-00/201).

 (7)  
Close the air conditioning access panels.

 S 865-091

 (8)  
Remove the electrical power if it is not necessary (AMM 24-22-00/201).

 S 415-007
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737-300/400/500MAINTENANCE MANUAL
 ENGINE BLEED AIR CONTROL SYSTEM - INSPECTION/CHECK
__________________________________________________
 1.  General_______
 A.  This procedure contains a task to inspect and check the engine bleed air control system with the use of a portable valve actuating test set. The task will examine the individual engine bleed air control system components for correct operation. The test will isolate the faulty component but will not determine the reason for the components fault.
 B.  In this inspection/check procedure, it is necessary to disconnect pneumatic supply pressure lines and pneumatic control pressure lines at the applicable engine. Instructions for these steps are given below. However, it is recommended that the figures in each procedure be used to help set up for each individual test.
 C.  The three procedures examine the items listed below:
 (1)  
Precooler Control Valve

 (2)  
Pressure Regulating and Shutoff Valve (PRSOV)

 (3)  
Bleed Air Regulator

 (4)  
　
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