(b)  
If this test is for the right engine, set the ISOLATION VALVE switch on the P5 panel to OPEN.

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737-300/400/500MAINTENANCE MANUAL
 (c)  Make sure that the applicable duct pressure pointer on the P5 panel shows 30 to 45 psi.
 NOTE: It is necessary that no other airplane systems use
____
 pneumatic power at this time.

 S 985-042
 WARNING: YOU MUST USE A RATCHETING-TYPE SOCKET WRENCH TO MANUALLY OPEN
_______ THE PRSOV. THE PRSOV WILL SUDDENLY TURN THE WRENCH SOCKET BUT THE RATCHET WILL PREVENT MOVEMENT OF THE WRENCH HANDLE. IF YOU DO NOT USE A RATCHETING-TYPE WRENCH, THE SUDDEN MOVEMENT OF THE PRSOV CAN CAUSE INJURY TO YOU.
 (6)  
Manually open the PRSOV with a ratcheting type wrench and hold it open.

 S 715-007

 (7)  
Do this test of the TAI valve operation:

 CAUTION: DO NOT ALLOW THE COWL TAI VALVE TO BE OPEN FOR MORE THAN
_______ 30 SECONDS. IF THE VALVE IS OPEN FOR MORE THAN 30 SECONDS, THERE CAN BE DAMAGE TO THE INLET COWL.
 (a)  
Set the applicable ENG ANTI-ICE switch to ON. 1) Make sure that the COWL VALVE OPEN light comes on bright (this shows that the valve is in transit).

 2)  Make sure that the COWL VALVE OPEN light becomes dim and stays on (this shows that the valve is open).

 (b)  
Make a record of the APU EGT after it becomes stable.

 (c)  
Make sure that the APU EGT is at least 30° C larger than the EGT you found before you opened the PRSOV.

 (d)  
Set the ENG ANTI-ICE switch to OFF. 1) Make sure that the COWL VALVE OPEN light comes on bright. 2) Make sure that the COWL VALVE OPEN light goes off.

 S 865-010
 (8)  
Put the pneumatic system to its initial condition:

 (a)  
Remove the wrench from the PRSOV.

 (b)  
BEJ B-2535 AND ON; Connect the electrical connector to the bleed air regulator.

 (c)  
Set the applicable engine BLEED switch to OFF.

 (d)  
If this test was for the right engine, set the ISOLATION VALVE switch to CLOSE.

 (9)  
Do the normal APU shutdown procedure (AMM 49-11-00/201).

 (10)
 Close the left thrust reverser half (AMM 78-31-00/201).

 S 865-008
 S 415-009
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 S 865-041
 (11) Remove electrical power (AMM 24-22-00/201).
 TASK 30-21-00-715-073
 4. Inlet Cowl Anti-Ice Operational Test with Ground Air Source
___________________________________________________________
 A. General
 (1)  If you do the Inlet Cowl Anti-Ice Operational Test with a Ground Air Source, do not do these procedures: Inlet Cowl Anti-Ice Operational Test with Engine power and Inlet Cowl Anti-Ice Operational Test with APU power.
 B. Equipment
 (1)  A ground source which can supply clean air at the correct pressure and flow values. It must have a connection which will mate with the ground pneumatic service connector on the airplane.
 C. References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 36-05-00/201, Ground Air Source (OPerational Procedures)

 (3)  
AMM 78-31-00/201, Thrust Reverser Systen

 D. Access
 (1)  
Location Zones
 101/102 Control Cabin
 200 Lower Half of the Fuselage

 (2)  
Access Panel
 3404 A/C Access Door, Right

 E. Inlet Cowl Anti-Ice Operational Test with Ground Air Source.
 S 015-048
 (1)  Open the right A/C access door, 3404, to get access to the pneumatic ground service connector.
 NOTE: The access door to the pneumatic ground service connector is
　
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