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 (2)  S 034-003Loosen the screws on the lightplate below the switch.
 (3)  S 034-004Remove the lightplate.
 (4)  S 034-005Open the overhead panel, P5.
 (5)  S 034-006Cut the switch wires at the switch. (a) Make sure the wire length is sufficient to make a splice for the replacement switch (WDM 20-10-13).

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A
747-400
MAINTENANCE MANUAL

SEE A
FLIGHT COMPARTMENT 
BSEE DIM/TEST SWITCH INDICATOR LIGHT 
BOTH OFF LWR BEACON ON OFF NAV  ON OFF STROBE  ON OFF WING  ON OFF LOGO  BRT DIM TEST IND LTS 
A 

B
Pilots Indicator Lights Dim/Test Switch Installation Figure 401
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A
747-400 MAINTENANCE MANUAL
 S 034-007
 (6)  
Remove the nut and lockwasher that attach the switch to the panel.

 S 024-008

 (7)  
Remove the switch from the panel.

 TASK 33-12-04-404-009
 3.  Switch Installation (Fig. 401)___________________
 A. References
 (1)  
AIPC 33-11-10

 (2)  
AMM 24-22-00/201, Manual Control

 (3)  
SSM 33-12-01

 (4)  
WDM 20-10-13

 B. Access
 (1)  Location Zone
 200 Upper Half of the Fuselage

 C. Procedure
 S 424-011
 (1)  
Install the switch in its position in the P5 panel.

 S 434-012

 (2)  
Install the lockwasher and nut to attach the switch to the P5 panel.

 S 434-013

 (3)  
Make a splice to add the replacement switch to the airplane wires (WDM 20-10-13).

 (4)  
Close the P5 panel.

 (5)
Install the lightplate around the switch and tighten its screws.

 S 864-016

 (6)  
Remove the DO-NOT-CLOSE tags and close each circuit breaker that was opened.

 S 434-015
 S 434-014
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A
747-400 MAINTENANCE MANUAL
 S 714-022
 (7)  Do a test of the switch.
 (a)  
Supply electrical power (AMM 24-22-00/201).

 (b)  
At the P5 panel, set the switch to the test position. 1) Make sure the panel indicator lights come on.

 (c)  
Set the switch to the usual position.

 (d)  
Remove electrical power if it is not necessary (AMM 24-22-00/201).

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 1.

2.

3.

A
747-400 MAINTENANCE MANUAL
 FLIGHT COMPARTMENT ILLUMINATION LIGHTS - DESCRIPTION AND OPERATION
__________________________________________________________________
General
_______
 A.  Flight compartment illumination is provided by flight compartment access lights and dome lights. Access lights provide entryway illumination from outside the airplane to the flight deck. Dome lights provide general area illumination of the flight compartment.
 (1)  
　
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