C. Prepare for the Removal
 S 864-025
 (1)  
Supply electrical power (Ref 24-22-00/201).

 S 014-026

 (2)  
Remove the left sidewall lining of the forward cargo compartment at station 580 (Ref 25-52-01/401).

 S 864-027

 (3)  
Make sure the supply fan and the exhaust fan for the equipment cooling system are on.

 S 864-067

 (4)  
Open this circuit breaker, on the P180 DC Power Distribution Panel, and attach a DO-NOT-CLOSE tag:

 (a)  180H30, EQUIP COOL CONT EXH FAN
 S 864-028
 (5)  Open this circuit breaker, on the P415 Power Distribution Center -Right, and attach a DO-NOT-CLOSE tag:
 (a)  415R14, EQPT COOLING EXHAUST FAN
 S 864-053
 (6)  
If the ambient temperature is more than 85°F (29°C), supply the conditioned air to the airplane (Ref 21-00-00/201).

 S 864-029

 (7)  
Make sure the equipment cooling system is in the closed loop mode:

 (a) Make sure the bypass valve is in the OPEN position
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747-400 MAINTENANCE MANUAL
 (b)  
Make sure the inboard supply valve is in the CLOSED position

 (c)  
Make sure the supply fan is on

 (d)  
Make sure the exhaust fan is off.

 D. Remove the Actuator
 S 034-064
 (1)  
Remove the moisture shroud from the valve.

 S 034-030

 (2)  
Loosen the clamps on the inboard exhaust valve.

 S 984-052

 (3)  
Turn the inboard exhaust valve until you can get access to the actuator.

 S 984-031

 (4)  
If the inboard exhaust valve is not fully closed, turn the manual override handle until the position indicator is in the CLOSED position.

 S 864-032

 (5)  
Open this circuit breaker, on the P414 Power Distribution Center -Left, and attach a DO-NOT-CLOSE tag:

 (a)  414A14, INBD EQPT COOL CONT VLV
 S 034-033
 (6)
Disconnect the electrical connector DV445 from the actuator.

 S 034-034

 (7)  
Remove the four bolts from the actuator.

 (8)  
Remove the actuator.

 S 024-051
 TASK 21-58-04-404-035
 5.  Inboard Exhaust Valve Actuator Installation___________________________________________
 A. References
 (1)  21-00-00/201, Air Conditioning
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MAINTENANCE MANUAL

 (2)  
24-22-00/201, Manual Control

 (3)  
25-52-01/401, Containerized Cargo Compartment Ceiling and Sidewall Linings

 (4)  
IPC 21-58-04 Fig. 3

 (5)  
WDM 21-58-13

 (6)  
SSM 21-58-03

 B. Access
 (1)  Location Zone
 121 Forward Cargo Compartment Forward Half, LH

 C. Prepare for the Installation
 S 824-037
 (1)  Make sure the actuator is in the closed position.
 (a)  
Connect the electrical connector DV445 to the actuator.

 (b)  
Close this circuit breaker on the P414 panel: 1) 414A14, INBD EQPT COOL CONT VLV

 (c)  
Make sure the position indicator on the actuator is at the CLOSED position.

 S 024-038
 (2)  If it is necessary to disconnect the electrical connector DV445 to put the actuator in its position, do the steps that follow:
 (a)  
Open this circuit breaker on the P414 panel:
 1) 414A14, INBD EQPT COOL CONT VLV

 (b)  
Disconnect the electrical connector DV445 from the actuator.

 D. Install the Actuator
　
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