S 866-024
 S 866-025
 S 866-026
 S 866-027
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747-400 MAINTENANCE MANUAL
 S 866-003
 (25)
 Close circuit breakers as follows for the applicable cargo door.

 (a)  
P59 Aft Equipment Panel
 1) AFT CARGO DOOR POWER UNITS

 (b)  
P414 Power Distribution Center - Left
 1) 414A21 LOWER CARGO DOOR FORWARD
 2) 414F15 CARGO DOOR CONTROL FORWARD
 3) 414F16 CARGO DOOR CONTROL AFT

 S 866-012
 (26) Close the door electrically (Ref 52-34-00/001)
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747-400 MAINTENANCE MANUAL
 CARGO DOOR EXTERNAL CONTROL SWITCH - REMOVAL/INSTALLATION
_________________________________________________________
 1.  General_______
 A. This procedure contains two tasks:
 (1)  
The first task is the removal of the external control switch from the cargo door.

 (2)  
The second task is the installation of the external control switch on the cargo door.

 TASK 52-34-10-004-001
 2.  External Control Switch - Removal_________________________________
 A. References
 (1)  
IPC 52-34-10 Fig 2

 (2)  
SSM 52-34-01, 52-35-01

 (3)  
WDM 52-34-11, 52-35-11

 B.
Access

 (1)  
Location Zone 122 Forward Cargo Container Compartment, Forward Half 142 Aft Cargo Container Compartment

 (2)  
Access Panel 122AR Door, Access - Forward Cargo Door Control Switch 142AR Door, Access - Control Switch Aft Cargo Door

 C.
Procedure

 S 864-003
 (1)  
Open these circuits breakers for the applicable cargo door and attach DO-NOT-CLOSE tags:

 (a)  
P59 Aft Equipment Panel
 1) AFT CARGO DOOR POWER UNITS

 (b)  
P414 Power Distribution Center - Left 1) 414A21 LOWER CARGO DOOR FWD 2) 414F15 CARGO DOOR CONTROL FWD 3) 414F16 CARGO DOOR CONTROL AFT

 S 024-005
 (2)  
Remove the switch as follows (Fig. 401):

 (a)  
Remove the four screws that attach the switchplate to the panel (View A, Fig. 401).

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747-400
MAINTENANCE MANUAL

BUSHING BUSHING SEAL SWITCH PAN NUT LOCKWASHER CARGO DOOR EXTERIOR CONTROL SWITCH SEE A  SWITCH NUT  SWITCH (6 LOCATIONS) TERMINAL 
CARGO DOOR EXTERIOR CONTROL SWITCH SEE A  CARGO DOOR CONTROL SWITCH  0.0025 OHMS RESISTANCE MAXIMUM LEVER PLATE SWITCH  A-A WASHER 
DOOR ACCESS 
A 
A 
(4 LOCATIONS) SCREW PLATE ATTACH  PAN SWITCH
A CARGO DOOR EXTERIOR CONTROL SWITCH 
Figure 401 Cargo Door Exterior Control Switch 

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 (b)  
Pull the switchplate with the switches installed.
　
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