FORWARD EQUIPMENT CENTER
APU BATTERY
(LEFT SIDE) B
AFT EQUIPMENT CENTER RACK, E6
C

Standby Power - Component Location
Figure 102 (Sheet 2)

G38587
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
 STANDBY POWER - INSPECTION/CHECK
________________________________
 1.  General_______
 A.  This procedure contains two tasks. The first task is an operational tests of the 115 volt AC standby power generation system. The test makes sure that the system supplies 115 volt ac power to the ac standby bus from both the left ac bus and the static inverter.
 B.  The second task is a functional test to make sure that all components in the system operate correctly. The test includes a check of these components:
 (1)  
Main Static Inverter

 (2)  
Main Battery

 (3)  
AC Standby Power Relay

 (4)  
Standby Power Switch

 (5)  
All other related components

 TASK 24-33-00-716-016
 2.  Operational Test - 115 volt AC Standby Power Generation________________________________________________________
 A.  References
 (1)  
AMM 24-22-00/201, Electrical Power - Control

 (2)  
AMM 31-41-00/201 EICAS - Maintenance Practices

 B.  Access
 (1)  Location Zones
 (a)  211/212 Flight Compartment
 C.  Procedure
 S 866-019
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 866-020

 (2)  
Make sure the BAT switch is in the ON position on the electrical power control panel.

 S 866-021

 (3)  
Make sure the STANDBY PWR switch is in the AUTO position on the electrical power control panel.

 S 866-022

 (4)  
Open INV PWR TRU (D10) circuit breaker on the main power distribution panel, P6.

 S 216-023

 (5)  
Make sure the yellow STBY BUS OFF light next to the STBY POWER switch is off.

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 24-33-00
 ALL  ú ú 01 Page 601 ú Mar 20/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
 S 216-024
 (6)  Make sure the EICAS message, STANDBY BUS OFF, does not show on the top EICAS display.
 NOTE: The EICAS message STANDBY INVERTER will show when you open
____ the INV PWR TRU circuit breaker. To erase this message use the EICAS Message Erase Procedure (AMM 31-41-00/201).
 S 866-025
 (7)  
Close the INV PWR TRU (D10) circuit breaker on the main power distribution panel, P6.

 S 866-026

 (8)  
Push the ELEC HYD switch on the EICAS MAINT panel on the right side panel, P61.

 S 866-027

 (9)  
Make sure these values show below STBY/BAT on the bottom EICAS display:

 AC-V 115 |5
 FREQ 400 |5
 DC-V 28 |2

 S 216-028
 (10) Make sure this value shows below APU/BAT on the bottom EICAS display:
 DC-V 28 |2
 S 866-029
 (11)
 Turn the STBY POWER switch to the BAT position for at least 30 seconds.

 S 216-030

 (12)
 Make sure the yellow DISCH light on the standby power control panel comes on.

 NOTE: The EICAS message MAIN DISCHARGE will show while the standby
____
 power system operates under battery power.

 S 216-031
 (13) Make sure this value shows below STBY/BAT on the bottom EICAS display:
 DC-V 25 |2
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 24-33-00
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