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747-400 FAULT ISOLATION/MAINT MANUAL
EMERGENCY LIGHTS
* SEE THE WDM OR SSM FOR THE EQUIPMENT NUMBER, QUANTITY, AND LOCATION OF EACH COMPONENT IN THE LIGHTING CIRCUIT.
Emergency Lights - Component Index
Figure 101
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747-400 FAULT ISOLATION/MAINT MANUAL
PILOTS'
SWITCH (P5)
OVERHEAD CIRCUIT
SEE A BREAKER PANEL, P7
EMER LIGHTS
OFF
ARMED
ON
PILOTS' SWITCH
A
FLIGHT COMPARTMENT
UPPER DECK DOOR
SEE C
SLIDE LIGHT
SEE B
SLIDE
LIGHT
MAIN DECK DOOR
SEE D
FUSELAGE (REF)
SLIDE LIGHT
(EXAMPLE)
B
Emergency Lights - Component Location
Figure 102 (Sheet 1)
E71876
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747-400 FAULT ISOLATION/MAINT MANUAL
SWITCH SEE
UPPER DECK PASSENGER COMPARTMENT
Emergency Lights - Component Location
Figure 102 (Sheet 2)
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747-400 FAULT ISOLATION/MAINT MANUAL
CEILING
POWER SUPPLY
(EXAMPLE)
POWER SUPPLIES WITH A TEST SWITCH
Emergency Lights - Component Location Figure 102 (Sheet 3)
E71930
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EMERGENCY LIGHT PROBLEMS
1
AT THE P5 PANEL, SET THE PILOT'S EMERGENCY LIGHTS SWITCH TO THE "ON" POSITION.
ARE SOME EMERGENCY LIGHTS ON?
1
YES
SEE SHEET 2 (BLOCK 2)
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747-400 FAULT ISOLATION/MAINT MANUAL
PREREQUISITES
MAKE SURE THESE CIRCUIT BREAKERS ARE CLOSED: 7G14
MAKE SURE THE AIRPLANE IS IN THIS CONFIGURATION: ELECTRICAL POWER IS ON (AMM 24-22-00/201)
NO
NO
10 SET THE PILOT'S EMERGENCY LIGHTS SWITCH TO THE "OFF"POSITION.
OPEN THESE CIRCUIT BREAKERS ON THE P7 OVERHEADCIRCUIT BREAKER PANEL (SSM 33-51-01):
7G14, EMER LTS
DISCONNECT ONE EMER LIGHT POWER SUPPLY FROM ITS ELECTRICAL CONNECTOR.
PREPARE TO MEASURE RESISTANCE BETWEEN PINS 3 AND1 (GROUND) OF THE WIRE BUNDLE CONNECTOR.
SET THE PILOT'S EMERGENCY LIGHTS SWITCH TO THE "ARMED"AND TO THE "ON" POSITIONS.
MONITOR RESISTANCE INDICATION AT ALL THREEPOSITIONS. THEN MOVE THE SWITCH TO "OFF" POSITION.
DID THE RESISTANCE INDICATION CHANGE FROMCONTINUITY IN POSITION "OFF" TO NO CONTINUITY IN SWITCH POSITIONS "ARMED" AND "ON"?
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