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747-400 MAINTENANCE MANUAL
 (e) (f)  Remove each DO-NOT CLOSE tag.Close each the circuit breaker that was opened.
 (4)  S 965-098For each light that did not stay on for 15 minutes, do this task to replace the batteries: Power Supply - Battery Replacement (AMM 33-51-04/201).
 (5)  S 865-084Set the pilot's switch to the off position.
 S 865-085

 CAUTION: SUPPLY ELECTRICAL POWER TO THE AIRPLANE FOR A MINIMUM OF 16
_______ HOURS TO FULLY CHARGE THE BATTERIES BEFORE SUBSEQUENT FLIGHTS . THE EMERGENCY LIGHTS CANNOT OPERATE CORRECTLY UNTIL THE BATTERIES ARE CHARGED.
 (6)  
Continue to supply electrical power to the airplane for a minimum of 16 hours after you complete the capacity test.

 S 865-086

 (7)  
Remove electrical power if it is not necessary (Ref 24-22-00/201).

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747-400 MAINTENANCE MANUAL
 EXIT SIGNS - MAINTENANCE PRACTICES
__________________________________
 1.  General_______
 A. This procedure has this task:
 (1)  Exit Sign - Lamp Replacement
 TASK 33-51-02-962-001
 2.  Exit Sign - Lamp Replacement (Fig. 201)____________________________
 A. References
 (1)  
IPC 33-51-02

 (2)  
SSM 33-51-01

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

 C. Lamp Replacement
 S 012-001
 (1)  Get access to the lamp.
 (a)  
SIGN ABOVE AN UPPER DECK DOOR; Release the fasteners on top of the panel to open the doorway surround that holds the exit sign.

 (b)  
SIGN ABOVE THE UPPER DECK AISLE NEAR THE STAIRWAY; Move the lens up.

 NOTE: The lens has a hinge on the top edge.
____
 S 962-002
 (2)  
Carefully replace the lamp.

 S 412-003

 (3)  
Put back each lens or panel that you opened for access.

 D. Lamp Test
 S 712-006
 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.
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747-400
MAINTENANCE MANUAL

 (1)  At the overhead panel, P5, or the attendant's panel, set the switch for the emergency lights to the on position. (a) Make sure the new lamp comes on correctly.
 S 862-005
 (2)  Set the switch to the off position. (a) Make sure the emergency lights go off.

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747-400 MAINTENANCE MANUAL
 POWER SUPPLY - MAINTENANCE PRACTICES
____________________________________
 1.  General_______
 A. This procedure contains these tasks:
 (1)  
Power Supply - Battery Replacement

 (2)  
Power Supply - Removal

 (3)  
Power Supply - Installation
　
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