S 862-033

 (2)  
Remove the electrical power if it is not necessary
 (AMM 24-22-00/201).

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2.

3.

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747-400 MAINTENANCE MANUAL
 STANDBY COMPASS - SERVICING(RELAMPING)
______________________________________General
_______
 A.  This procedure contains two tasks. The first is for the removal of the standby compass lamp. The second one is for the installation of the replacement lamp.
 B.  The standby compass (N100) is installed on the forward overhead panel (P43).
 TASK 34-22-01-003-001
Remove The Standby Compass Lamp (Fig. 301)

______________________________

 A.  Standard Tools and Equipment
 (1)  Lamp - standby compass
 B.  Access
 (1)  Location Zones
 221 Control Cabin, LH

 C.  Procedure
 S 863-002
 (1) Open these circuit breakers and attach the DO-NOT-CLOSE tags:
 (a)  P6 Main Power Distribution Panel
 1) 6E21 FLT DK LIGHTS PANEL GLARE SHIELD
 2) 6L1 FLT DECK LIGHT STBY INST

 S 033-003
 (2)  Do these steps to remove the standby compass lamp:
 (a)  
Remove the lampholder assembly and lamp.

 (b)  
Remove the lamp from the lampholder assembly.

 TASK 34-22-01-403-004
Install The Standby Compass Lamp (Fig. 301)

________________________________

 A.  Standard Tools and Equipment
 (1)  Lamp - standby compass
 B.  Reference
 (1)  
24-22-00/201, Manual Control

 (2)  
34-22-00/201, Standby Magnetic Compass

 C.  Access
 (1)  Location Zones
 221 Control Cabin, LH

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747-400
MAINTENANCE MANUAL

FLIGHT COMPARTMENT

LAMPHOLDER ASSEMBLY

A

Standby Compass Location
Figure 301

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747-400 MAINTENANCE MANUAL
 D. Install the standby compass lamp.
 S 863-005
 (1)  Make sure these circuit breakers are open with the DO-NOT-CLOSE tags attached:
 (a)  P6 Main Power Distribution Panel
 1) 6E21 FLT DK LIGHTS PANEL GLARE SHIELD
 2) 6L1 FLT DECK LIGHT STBY INST

 S 433-006
 (2)  Do these steps to install the standby compass lamp:
 (a)  
Put the lamp into the lampholder assembly.

 (b)  
Install the lampholder assembly on the compass.

 S 863-007
 (3) Remove the DO-NOT-CLOSE tags and close these circuit breakers:
 (a)  P6 Main Power Distribution Panel
 1) 6E21 FLT DK LIGHTS PANEL GLARE SHIELD
 2) 6L1 FLT DECK LIGHT STBY INST

 S 863-008
 (4)  
Supply the electrical power (Ref 24-22-00/201).

 (5)  
Make sure the panel light switch is in the ON position.

 (6)  
Make sure the standby compass internal lights are on.

 S 863-009
 S 213-010
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