33-12-03
 ALL  ú ú 01 Page 204 ú Oct 10/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 C. Removal Procedure
 S 862-054
 (1)  Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  P6 Main Power Distribution Panel
 1) 6D19 P5 PB SW LTS
 2) 6F19 FLT DK LIGHTS PILOT MISC IND 1
 3) 6F20 FLT DK LIGHTS PILOT MISC IND 2
 4) 6F26 FLT DK LIGHTS F/O IND
 5) 6F27 FLT DK LIGHTS F/O IND DGTL DSPL
 6) 6L4 FLT DK LIGHT CAPT IND
 7) 6L5 FLT DECK LIGHT CAPT IND DGTL DSPL
 8) 6E20 FLT DK LIGHTS PANEL OVHD

 S 862-024
 WARNING: OPEN THE SYSTEM CIRCUIT BREAKERS CONTROLLED BY THE PUSHBUTTON
_______ SWITCH. THE INSTALLATION OF THE LENS CAP INTO THE SWITCH CAN OPERATE THE SWITCH AND CAUSE ITS SYSTEM TO OPERATE. THE ACCIDENTAL OPERATION OF A SYSTEM CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (2)  
Open the circuit breakers to all airplane systems controlled by the pushbutton switch and attach DO-NOT-CLOSE tags.

 S 032-055

 (3)  
Get access to the module:

 (a)  Push the lens cap with your finger to get an extension of the lens cap from its installed position.
 CAUTION: DO NOT HOLD THE SWITCH LENS CAP WITH A TOOL OR THE LENS
_______ CAP CAN BE DAMAGED. REMOVE THE LENS CAP WITH YOUR FINGERS
 (b)  Hold the lens cap with your fingers and pull it away from the pushbutton switch.
 S 022-056
 (4)  Remove the module:
 (a)  
Turn the lens cap 90 degrees to get access to the mounting lug screws on the master module.

 (b)  
Turn the mounting lug screws counterclockwise until the mounting lugs on the master module retract.

 (c)  
Put your finger between the retainer wires and against the lens cap.

 (d)  
With your finger, pull the lens cap away from the housing assembly and remove the module (See Fig. 201).

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 33-12-03
 ALL  ú ú 01 Page 205 ú Jun 10/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (e)  
If the retainer wires become disconnected from the master module before the module has been removed, do these steps: 1) Make sure the mounting lugs are fully retracted on each

 side of the module. 2) Remove the master module with needle nose pliers.

 (f)  
Remove the lens cap and the retainer wires from the master module.

 TASK 33-12-03-402-032
 5. Master Module Installation (Fig.__________________________201)
 A. References
 (1)  24-22-00/201, Manual Control
 B. Access
 (1)  Location Zone 200 Pilots Instrument Panels - Flight Compartment
 C. Installation Procedure
 S 422-057
 (1)  Install the module:
 (a)  
Attach the lens cap and the retainer wires to the master module.

 (b)  
Put the master module with its attached lens cap into the housing assembly.

 (c)  
Push the master module into the housing until the module pins connect with the socket in the housing. 1) Push at the center of the module with your finger to make

 sure the module is fully engaged.

 (d)  
Use a screwdriver to tighten the mounting lug screws as follows: 1) Make sure the mounting lugs extend into the detent holes of

 the mounting sleeve.
 2) Turn the mounting lug screws clockwise until any loose fit
 of the lugs is gone.
 3) First tighten one screw 1/4 turn.
 4) Then tighten the second screw 1/4 turn.
 5) Do the last two steps in 1/4 - turn increments until the
 mounting lugs are tight. 6) Do not turn the screws more than 1-1/4 total turns (Ref 20 inch ounces).
 S 432-058
 (2)  Install the lens cap:
 (a)  
Push the lens cap into the housing until the module cam plate engages the lens cam lock.
　
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