20A IDENTIFY AND LOCATE THE
POWER SUPPLY CONNECTED TO EACH
EMERGENCY LIGHT THAT DID NOT
COME ON (SSM 33-51-02).
 FOR LIGHTS THAT USE AN EXTERNAL POWER SUPPLY, DO FIG. 104.
 FOR LIGHTS THAT HAVE A SELF-CONTAINED POWER SUPPLY, DO FIG. 105.
CONSERVE BATTERY CHARGE. KEEP THE EMERGENCY LIGHT OPERATION TO MINIMUM TIME NECESSARY.
Emergency Light Problems
Figure 103 (Sheet 1)

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E80529
A
747-400 MAINTENANCE MANUAL
 EMERGENCY LIGHTS - MAINTENANCE PRACTICES
________________________________________
 1.  General_______
 A.  This procedure contains these tasks:
 (1)
Disconnect an electrical connector.

 (2)
Connect an electrical connector.

 TASK 33-51-00-032-001
 2.  Disconnect an Electrical Connector__________________________________
 A.  References
 (1)
SSM 33-51-01

 (2)
WDM 33-51-11 thru 33-51-99

 B.  Access
 (1)  Location Zone 200 Upper Half of the Fuselage
 C.  Procedure
 S 212-002
 (1)
Refer to the SSM or WDM for the location of the connectors.

 S 032-004

 (2)
Disconnect the electrical connector.

 CAUTION: KEEP THE OPERATION OF THE EMERGENCY LIGHTS TO LESS THAN A
_______ ONE MINUTE TIME. THE BATTERIES THAT SUPPLY THE ELECTRICAL POWER TO THE EMERGENCY LIGHTS WILL ONLY OPERATE FOR 15 MINUTES WHEN FULLY CHARGED.
 (a) Make sure no emergency lights come on.
 1)  If emergency lights come on, then quickly do one of these steps to make those lights go off: a) Ground the applicable pins of the electrical connector
 (SSM 33-51-01 or WDM 33-51-11 thru 33-51-99). b) Disconnect the electrical connector between the lights that are on and their power supply.
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747-400 MAINTENANCE MANUAL
 TASK 33-51-00-432-006
 3.  Connect the Electrical Connector________________________________
 A. References
 (1)  
AMM 33-51-00/501, Emergency Lights

 (2)  
SSM 33-51-01

 (3)  
WDM 33-51-11 thru 33-51-99

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

 C. Procedure
 S 432-007
 (1)  
If you grounded the electrical connector, then remove the ground wires.

 S 432-011

 (2)  
Connect the electrical connector.

 (3)  
Do the system test of the emergency lights (AMM 33-51-00/501).

 S 862-008
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747-400 MAINTENANCE MANUAL
 EMERGENCY LIGHTS - ADJUSTMENT/TEST
__________________________________
 1.  General
_______
 A.  This procedure contains these tasks:
 (1)  
Emergency Lights - Operational Test with the Pilot's Switch

 (2)  
Emergency Lights - Functional Test

 (3)  
Emergency Lights - System Test

 B.  This procedure is not for self-illuminated exit signs. A
 self-illuminated exit signs is always on.

 TASK 33-51-00-715-001
 2.  Emergency Lights - Operational Test with the Pilot's Switch
　
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