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33-12-01
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A
747-400
MAINTENANCE MANUAL
ELECTRICAL
CONNECTORS
DIMMER CARD (4 LOCATIONS)
(EXAMPLE)
TEST RELAYS
(POSITIONS
1,3,5 AND 7)
DIMMER RELAYS
(POSITIONS 2,4,6 AND 8) TIME DELAY RELAY
(FRONT VIEW)
GREEN LIGHT EMITTING DIODE INDICATORS ON THE DIMMER CARDS
MODULE COVER
(RIGHT SIDE)
Master Dim and Test Component Replacement
Figure 201
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747-400 MAINTENANCE MANUAL
INDICATOR LIGHT - MAINTENANCE PRACTICES
_______________________________________
1. General_______
A. This procedure contains these tasks for an indicator light:
(1)
Replace the lamps.
(2)
Replace the diode/fuse card.
(3)
Remove the indicator light assembly.
(4)
Install the indicator light assembly.
B. Two lamps are installed in each indicator light.
(1)
Do not operate the indicator light with only one lamp.
(2)
An internal short circuit can occur if you install the lens in the module with one lamp.
TASK 33-12-02-962-001
2. Lamp Replacement (Indicator Light) (Fig. 201)__________________________________
A. References
(1)
24-22-00/201, Manual Control
(2)
SSM 33-12-01
(3)
IPC 33-12-02 Fig. 20
B. Access
(1) Location Zone 200 Flight Compartment , Pilots' Instrument Panels
C. Replacement Procedure
S 862-059
(1)
Supply electrical power (Ref 24-22-00/201).
S 712-060
(2)
Find the defective lamps:
(a)
Put the IND LTS switch on the P5 panel to the TEST position.
(b)
Identify the lamps that do not come on.
(c)
Put the IND LTS switch to the BRT position.
S 862-061
(3) Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a) P6 Main Power Distribution Panel 1) 6F19 FLT DK LIGHTS PILOTS MISC IND 1 2) 6F20 FLT DK LIGHTS PILOTS MISC IND 2 3) 6F26 FLT DK LIGHTS F/O IND 4) 6F27 FLT DK LIGHTS F/O IND & DIG DISP 5) 6L4 FLT DK LIGHT CAPT IND 6) 6L5 FLT DK LIGHT CAPT IND & DIG DISP
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A
747-400
MAINTENANCE MANUAL
DIODE/FUSE CARD PANEL
SEEA B
LAMP
(2 LOCATIONS)
2
DRAWER ASSEMBLY
LENS CAP ASSEMBLY
DIODE/FUSE CARD REMOVAL INDICATOR LIGHT (EXAMPLE)
(EXAMPLE) A
INDEX
DRAWER
ASSEMBLY
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