(a)  Align the duct with the mixture valve and the check valve for the cold air.

 (10)
 Install the forward and the aft clamps of the hot air duct.

 S 434-022

 (11)
 Tighten the support clamp.Do the Installation Check for the Pack Valve

 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 434-021
 S 864-039
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 S 864-038
 (2)  
Supply pneumatic pressure with the APU (AMM 36-05-00/201).

 S 864-049

 (3)  
Make sure the APU BLEED switch is set to ON.

 S 864-024

 (4)  
Put the ISOLATION VALVE switch to OPEN.

 S 864-027

 (5)  
Position the BLEED 1 switch to ON.

 S 864-025

 (6)
Put the PACK switch for the pack valve that was replaced to AUTO.

 (a)  Make sure that the pack valve moves to an open position.
 S 794-028
 (7)  Examine the duct connections for leakage.
 (a)  
A small leak is OK

 (b)  
You must repair a large leak

 S 864-030
 (8)  Position the L and R PACK switches to HIGH.
 (a)  Make sure the two pack valves move to the full open position.
 S 864-040
 (9)  Set the pack switch to OFF on the pack that does not have the new pack valve.
 (a)  Make sure the valve that you installed moves away from the full open position.
 NOTE: If the valve does not move, it is possible that there is
____ a problem with the APU. If the valve did not move, put the pack that operates in AUTO. Make sure the valve moves away from the open position.
 S 214-041
 (10) Disconnect electrical connector D392 (left pack valve) or D394 (right pack valve) from the valve that you installed.
 (a)  Make sure the valve moves farther away from the open position.
 E. Put the Airplane Back to Its Usual Position
 S 864-042
 (1)  
Set the L and R PACK switches to OFF.

 S 864-047

 (2)  
Connect electrical connector D392 (left pack valve) or D394 (right pack valve).

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 (3)  S 864-043Turn the isolation valve switch to its usual position.
 (4)  S 864-044Remove pneumatic pressure (AMM 36-05-00/201).
 (5)  S 414-032Close the equipment bay access doors for the air conditioning.
 (6)  S 864-045Remove the electrical power if it is not necessary (AMM 24-22-00/201).

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 RAM AIR SYSTEM - DESCRIPTION AND OPERATION
__________________________________________
 1.  General_______
 A.  The ram air system provides for two different methods of operation. During flight, ram air is used as a cooling medium for the air cycle system heat exchangers. An air cycle system utilizes a turbofan to induce airflow through the same ducts for ground operation and during flight when flaps are in any position other than retracted. A ram air system is included for each air cycle system (Fig. 1).
 B.  The ram air system provides a cooling medium for the air-to-air primary and secondary heat exchangers. The heat exchangers are located so that air passing through the ram air ducts must pass through the heat exchangers. A turbofan is installed between duct sections near the aft end of the ram air system.
　
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