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 3)  Supply electrical power (Ref 24-22-00/201).
 (b)  Do the test with the engine in operation. 1) Make sure the oil level for the air conditioning systems turbofans are not below the add line on the dipsticks. 2) Make sure the ACM's oil level is not less than 3/4 of the
 distance to the top of their sight glasses. 3) Start the engine (Ref 71-00-00/201).
 NOTE: Ignore the changes in the manifold pressure gage
____ when these conditions occur:
 -You move the 1 BLEED and 2 BLEED switches.
 -
The isolation valve closes

 -
The PACK switch is in the CLOSED position.

 4)  Put the switches that follow, on the overhead panel, to the position shown: a) The ISOLATION valve switch to the CLOSED position. b) The BLEED switch to the OFF position c) The PACK switch to the AUTO or HIGH position. d) The RECIRC FAN switch to the AUTO position.
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 5)
6)
7)
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737-300/400/500MAINTENANCE MANUAL
 e)  The cabin temperature selectors to the MANUAL-OFF
 position. f) The APU BLEED switch to the OFF position. g) Make sure the indicator for the bleed air pressure
 shows not more than 10 psi.With the engine at idle, do the steps that follow: a) Put the BLEED switch to the ON position. b) Permit the pressure to become stable. c) Make sure the indicator for the bleed air pressure
 shows 10-25 psi.Do the steps that follow while you monitor the pressure indicator:
 NOTE: When the bleed system changes from the 9th stage
____ to the 5th stage, the duct pressure will decrease approximately 6 psig. When you continue to increase the engine power, the duct pressure will increase and become stable between 36-52 psig.
 a)  Slowly increase the engine power.
 b)  Make sure the pressure goes to 25-33 Psig (25-35 psig. for airplanes with the improved high stage regulator). and becomes stable.
 c) Continue to increase the engine power to 80% N1. d) The pressure will become stable between 36-52 psig.Slowly decrease the engine power.
 NOTE: When the bleed system goes from the 5th stage to
____ the 9th stage, the duct pressure will go to approximately 20 psig. This occurs before the 9th stage valve can open and regulate the duct pressure between 25-33 psig (25-35 psig for airplanes with the improved high stage regulator).
 a)  Make sure the pressure indicator goes in the opposite direction to the step above.
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 8) Put the BLEED switch to the OFF position.
 9) Make sure the pressure indicator for the bleed air shows

 not more than 10 psi. 10) Stop the engine (Ref 71-00-00/201). 11) Do the test again for the other engine.
 E. Put the Airplane to Its Usual Condition
 S 864-028
 (1)  
Remove the electrical power if it is not necessary
 (Ref 24-22-00/201).

 S 864-029

 (2)  
Remove the pneumatic power if it is not necessary (36-05-00/201).

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 HIGH-STAGE VALVE AND HIGH-STAGE REGULATOR - ADJUSTMENT/TEST
___________________________________________________________
 1.  General_______
 A.  This procedure contains a task to operationally check the High-Stage Valve and High-Stage Regulator. The procedure will check that the:
 -Sense lines have no leaks
 -
High stage valve will operate satisfactorily
　
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