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 ú  1) Do a check that high velocity warm air flows from the ram
 ú  air exhaust duct.
 ú 
        ú
 NOTE: If high velocity warm air flows from the ram air____
 ú  exhaust duct, the turbofan valve has opened to let
 ú  pneumatic air operate the turbofan to pull air
 ú  through the ram air duct.
 ú
 (h) Do a check for air leakage at the connections.
 1) You must repair all large leaks at the connections.
 NOTE: Small leaks are permitted.____
 (i) Put the air conditioning PACK switch in the OFF position.
 1) Make sure the turbofan valve closes.
 ú  a) Do a check that high velocity warm air no longer flows
 ú  from the ram air duct.
 (j) Put the air conditioning PACK switch in the HIGH position.
 1) Make sure the turbofan valve opens.
 ú  a) Do a check that high velocity warm air flows from the
 ú  ram air exhaust duct.

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737-300/400/500MAINTENANCE MANUAL
 (k)  Put the air conditioning PACK switch in the OFF position.
 1)  Make sure the turbofan valve closes.
 ú  a)  Do a check that high velocity warm air no longer flows
 ú  from the ram air exhaust duct.
 F.  Put the Airplane Back to Its Usual Condition
 S 864-010
 (1)  Put the ISOLATION VALVE switch in the CLOSE position.
 S 864-009
 (2)  Remove the pneumatic system pressure if it is not necessary
 (Ref 36-05-00/201).
 S 864-011
 (3)  Remove the electrical power if it is not necessary
 (Ref 24-22-00/201).
 S 414-012
 (4)  Close the applicable A/C access panel 3304 or 3404.

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737-300/400/500MAINTENANCE MANUAL
RAM AIR DUCTACCESS DOOR
SEE B
EQUIPMENT BAY DOORS SEE A
SEE C
CLAMP  ELECTRICAL 
CONNECTOR  FWD 
A 
CLAMP 
TURBOFAN 
VALVE 

ELECTRICAL CONNECTORFWD
BONDING
BONDING JUMPER
JUMPER INBD

ELECTRICAL CONNECTOR
ELECTRICAL
CONNECTOR
RIGHT TURBOFAN VALVE
CLAMP

B TURBOFAN VALVE
INBD FWD
LEFT TURBOFAN VALVE
C
Turbofan Valve Installation Figure 401
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737-300/400/500MAINTENANCE MANUAL
 RAM AIR INLET CONTROL CABLES - ADJUSTMENT/TEST
______________________________________________
 1.  General_______
 A.  There are two tasks in this procedure:
 (1)  
Ram Air Inlet Control Cables - Adjustment

 (2)  
Ram Air Modulation System - Operational Test

 B.  The adjustment procedure is applicable to the control cables on the left or right side. You can adjust the left side cables and the right side cables at the same time.
 C.  The operational test makes sure that the modulation system operates correctly after the control cables have been adjusted.
 TASK 21-52-81-825-001
 2.  Ram Air Inlet Control Cables - Adjustment_________________________________________
 A.  Special Tools and Equipment
 (1)  
　
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