33-51-04
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 712-054
 (2)  To do a test of a power supply with its test switch, do these steps:
 (a)  At the power supply, set the test switch to the on position. 1) Make sure the emergency lights connected to the power supply come on (SSM 33-51-01).
 2)  Make sure the emergency lights go off automatically after approximately 1 minute.
 S 412-055
 (3)  Close each panel that was opened to get access to the power supply.
 TASK 33-51-04-002-017
 3.  Power Supply Removal____________________
 A.  References
 (1)  
AIPC 33-51-04

 (2)  
AMM 20-41-02/201, Electrostatic Discharge Sensitive Devices

 (3)  
AMM 25-21-02/401, Upper Deck Window Reveal and Shade

 (4)  
AMM 25-22-03/401, Upper Deck Ceiling Panels

 (5)  
SSM 33-51-01 thru 33-51-99

 (6)  
WDM 33-51-12 thru 33-51-99

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

 C.  Remove the Power Supply
 S 862-065
 (1)  Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  On the overhead circuit breaker panel, P7: 1) 7G14, CHG EMER LT
 S 012-056
 (2)  Get access to the power supply.
 (a)  
On the upper deck, for a power supply above a ceiling panel, open the ceiling panel (AMM 25-22-03/401 and SSM 33-51-01 thru 33-51-06).

 (b)  
On the upper deck, for a power supply outboard of the floor, remove the window reveal (sidewall) panel (AMM 25-21-02/401 and SSM 33-51-01 thru 33-51-06).

 NOTE: It is not necessary to remove the seats.
____
 CAUTION: DO NOT TOUCH THE POWER SUPPLY BEFORE YOU DO THE PROCEDURE
_______ FOR DEVICES THAT ARE SENSITIVE TO ELECTROSTATIC DISCHARGE. ELECTROSTATIC DISCHARGE CAN CAUSE DAMAGE TO THE POWER SUPPLY.
 (c)  
Do the procedure for devices that are sensitive to electrostatic discharge (AMM 20-41-01/201).

 (d)  
Disconnect the electrical connector.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (e) Remove the fasteners and remove the power supply.
 TASK 33-51-04-402-023
 4.  Power Supply Installation_________________________
 A. References
 (1)  
AIPC 33-51-04

 (2)  
AMM 20-41-02/201, Electrostatic Discharge Sensitive Devices

 (3)  
SSM 33-51-01 thru 33-51-99

 (4)  
WDM 33-51-12 thru 33-51-99

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

 C. Install the Power Supply
 S 422-058
 (1)  Install the power supply.
 NOTE:____Make sure you install the correct power supply. It is
 possible that the emergency lights will not operate correctly, if they are connected to a different power supply.
 CAUTION: DO NOT TOUCH THE POWER SUPPLY BEFORE YOU DO THE PROCEDURE
_______ FOR DEVICES THAT ARE SENSITIVE TO ELECTROSTATIC DISCHARGE. ELECTROSTATIC DISCHARGE CAN CAUSE DAMAGE TO THE POWER SUPPLY.
 (a)  
Do the procedure for devices that are sensitive to electrostatic discharge (AMM 20-41-02/201).

 (b)  
Put the power supply in its position and install the fasteners.

 (c)  
Connect the electrical connector.

 S 862-067
 (2) Remove the DO-NOT-CLOSE tags and close these circuit breakers:
 (a)  On the overhead circuit breaker panel, P7: 1) 7G14, CHG EMER LT
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 33-51-04
 ALL  ú ú 06 Page 205 ú Jun 10/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
　
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