C.
Procedure

 S 864-131
 (1)
Open these circuit breakers for the applicable EICAS system:

 (a)  
P7 Overhead Circuit Breaker Panel
 1) 7F8 UPR EICAS

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A
747-400
MAINTENANCE MANUAL

DOOR WARNING SWITCH
SEE

 C20799
Figure 405

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747-400 MAINTENANCE MANUAL
 2) 7F9 EIU L
 3) 7F10 EIU C
 4) 7F14 LWR EICAS
 5) 7F15 EIU R

 S 024-132
 (2)  Remove the warning switch for the upper deck door.
 WARNING:_______BE CAREFUL WHEN YOU WORK NEAR THE OPEN DOORWAY. THE DOOR SILL IS APPROXIMATELY 25 FEET ABOVE THE GROUND. IF YOU FALL THROUGH THE DOORWAY, INJURY CAN OCCUR.
 (a)  
Open the upper deck door.

 (b)  
Remove the door warning switch. 1) Disconnect the electrical wire from the switch. 2) Remove the nut from the switch. 3) Remove the lockwasher and the keywasher. 4) Remove the door warning switch from the mounting bracket.

 TASK 52-71-01-004-102
 9.  Switch Removal from the Nose Cargo Door Warning System (Fig. 406)______________________________________________________
 A. References
 (1)  
24-22-00/201, Manual Control

 B.
Access

 (1)  
Location Zones
 801 Nose Cargo Door

 C.
Procedure

 S 864-105
 (1)  
Open the door to get access to the switches.

 (a)  
Remove the lockwire from the switch.

 (b)  
Remove the locknut, the lock washer and the key washer from the switch.

 (c)  
Remove the bar from the bracket.

 (d)  
Remove the switch from the bar.

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MAINTENANCE MANUAL

LATCH SWITCH (16 LOCATIONS)
SEE B
NOSE CARGO DOOR NOSE DOOR AND LIGHT MODULE, H121
DOOR LATCH ANNUNCIATOR, H449
DOOR CLOSED ANNUNCIATOR, H548
DOOR CLOSEDSWITCH (2 LOCATIONS)
SEE A
Nose Cargo Door Warning Switches Figure 406 (Sheet 1)
C20802
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747-400
MAINTENANCE MANUAL

SWITCH 
ACTUATOR 
DOOR CLOSED 
SWITCH 
SWITCH 
BRACKET 
NOSE CARGO  AIRPLANE 
DOOR  STRUCTURE 
BOLTS 
(4 LOCATIONS) 
MANUAL 
DOOR CLOSED SWITCH  DRIVE INPUT 
A 
LATCH 
ACTUATOR 

LATCH SWITCH
LATCH SWITCH (EXAMPLE)
B
Nose Cargo Door Warning Switches Figure 406 (Sheet 2)
 C20805
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