NOTE: This will decrease the risk of failure of the actuator that
____
 is installed.

 TASK 21-52-11-004-001
 2.  Remove The Ram Air Actuator (Fig. 401)
___________________________
 A.  References
 (1)  AMM 21-52-12/401, Ram Air Temperature Controller
 B.  Access
 (1)  Location Zones
 211 Left Ram Air Duct
 213 Right Ram Air Duct

 C.  Procedure
 S 014-002
 (1)  
Open the access door for the ram air duct.

 (2)  
Remove the electrical connector from the actuator.

 (3)  
Remove the bonding jumper from the actuator.

 S 024-005

 (4)  
Remove the bolt assemblies at the top and bottom of the actuator that attach the actuator to the structure.

 S 034-003
 S 034-004
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737-300/400/500MAINTENANCE MANUAL
 S 024-023
 (5)  Remove the ram air controller.
 NOTE: You must remove the controller only if the actuator that
____ you will install has a part number of 541674-3 or -5.
 (a)  
Open the applicable circuit breaker on the P6-4 power panel: 1) AIR COND RAM MOD RIGHT C400 2) AIR COND RAM MOD LEFT C399

 (b)  
Install a DO-NOT-CLOSE tag on the circuit breaker.

 (c)  
Disconnect the electrical connector from the ram air controller.

 NOTE: The ram air controller is installed on the inboard
____ side of the keel beam downstream of the turbofan.
 (d) Remove the ram air controller (AMM 21-52-12/401).
 TASK 21-52-11-404-006
 3.  Install The Ram Air Actuator (Fig./401)
____________________________
 A.  Special Tools and Equipment
 (1)  F70207-93 Rigging Pin Kit
 B.  References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 21-52-12/401, Ram Air Temperature Controller

 (3)  
AMM 32-09-10/001, Landing Gear Logic Shelf

 C.  Access
 (1)  Location Zones
 205 Electronic Compartment
 211 Left Ram Air Duct
 213 Right Ram Air Duct

 D.  Procedure
 S 424-027
 (1)  Install the ram air controller if it was removed.
 (a)  Make sure that a check has been performed on the ram air controller if you install an actuator with a part number of 541674-3 or -5.
 NOTE: This will decrease the risk of the failure of the
____ actuator that is installed.
 1)  Use the instructions of the manufacturer of the ram air controller to do the check.
 (b) Install the ram air controller (AMM 21-52-12/401).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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A 737-300/400/500MAINTENANCE MANUAL
 (c)  
Connect the electrical connector to the ram air controller.

 (d)  
Remove the DO-NOT-CLOSE tag from the circuit breaker on the P6-4 power panel.

 (e)  
Close the applicable circuit breaker on the P6-4 panel: 1) AIR COND RAM MOD RIGHT C400 2) AIR COND RAM MOD LEFT C399

 S 984-007
 (2)  
Manually turn the torque shaft quadrant until you can install the rigging pin.

 S 834-008

 (3)  
Install the rigging pin.

 S 424-009

 (4)  
Put the actuator in its position and install the bolt assemblies at the top of the actuator.

 S 434-010

 (5)  
Install the bonding jumper.

 S 434-011

 (6)  
Install the electrical connector.

 S 864-018
 CAUTION: MANUALLY HOLD THE ACTUATOR AWAY FROM THE TORQUE SHAFT QUADRANT
_______ WHEN YOU DO THE TEST. IF THE ACTUATOR AND TORQUE SHAFT QUADRANT TOUCH WITH THE RIGGING PIN INSTALLED, DAMAGE TO THE EQUIPMENT CAN RESULT.
　
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