(4)  
WDM 24-51-81

 (5)  
SSM 24-51-09

 B.
Access

 (1)  
Location Zone 118 Electrical and Electronics Compartment, RH

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH MAIN ú

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 DECK CARGO HANDLING  ú ú 02 Page 403 ú Oct 10/95
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A
747-400 MAINTENANCE MANUAL
 (2)  Access Panel
 P715 Aux/Ext No. 2 Power Center

 C. Install Relay
 S 424-015
 (1)  
Position applicable relay in panel, aligning screw holes.

 S 434-016

 (2)
Install four screws securing relay to panel. Tighten screws.

 S 434-030

 (3)  
Remove the two terminal covers, by removing screws securing covers.

 S 434-017

 (4)  
Remove terminal nuts and washers from each of the terminal studs of the relay.

 S 434-018
 CAUTION: ENSURE EACH TERMINAL LEAD IS CONNECTED TO PROPER TERMINAL STUD
_______ ON RELAY. INCORRECT INSTALLATION WILL RESULT IN CIRCUIT MALFUNCTION AND/OR DAMAGE TO EQUIPMENT.
 MAKE SURE ROUND WASHERS ARE INSTALLED BETWEEN TERMINAL NUT AND PHASE LEAD. DO NOT INSTALL ANY WASHERS BENEATH PHASE LEADS. THIS WILL RESULT IN LOCALIZED RESISTANCE HEATING WHICH COULD CAUSE BURNING OF RELAY TERMINALS.
 (5)  
Connect lower terminal leads to lower terminal studs on relay and secure with washers and nuts. Tighten nuts.

 S 434-020

 (6)  
Install lower terminal cover on relay.

 S 434-021

 (7)  
Connect upper terminal leads to upper terminal studs on relay and secure with washers and nuts. Tighten nuts.

 S 434-022

 (8)  
Install upper terminal cover on relay and secure with two screws. Tighten screws.

 (9)  
Close P715 panel access door.

 S 434-023
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH MAIN ú

 24-51-04
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747-400 MAINTENANCE MANUAL
 S 864-024
 (10)
 Remove DO-NOT-OPERATE identifier from the BATTERY switch.

 D.
Test Relay

 S 864-025
 (1)
Apply external power No. 2 on the airplane (AMM 24-22-00/201).

 S 214-033

 (2)
In the main equipment center, make sure the following light is on.

 (a)  
On the Aux/Ext No. 2 Power Center, P715, make sure the EXT PWR, HOT BUS WARNING LIGHTS NO. 2 is on.

 S 714-034
 (3)  
On the main cargo deck, make sure the power drive units (PDUs) operates (AMM 25-57-01/401).

 S 864-032

 (4)  
Apply APU power to the airplane (AMM 24-22-00/201).

 S 714-035

 (5)
In the main equipment center, make sure the following light is on.

 (a)  
On the Aux/Ext No. 2 Power Center, P715, make sure the APU, HOT BUS WARNING LIGHTS NO. 2 is on.

 S 714-036
 (6)  
On the main cargo deck, make sure the power drive units (PDUs) operates (AMM 25-57-01/401).

 S 714-027

 (7)  
Call up existing faults for chapter 24 (if any) through the CMCS and verify that none of the main deck cargo handling relay maintenance messages are displayed (AMM 45-10-00/201).

 (8)  
Restore airplane to normal condition.

 S 554-037
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747-400 MAINTENANCE MANUAL
 UTILITY POWER ELECTRICAL LOAD CONTROL UNIT - REMOVAL/INSTALLATION
　
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