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757
MAINTENANCE MANUAL
CHARGER INTLKDISABLE RELAY RELAY
MAIN BATTERY APU BATTERY
1 AIRPLANES WITH 5 KVA HMG
Electrical Load Distribution Block Diagram
Figure 1 (Sheet 1)
A73925
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A
757
MAINTENANCE MANUAL
CHARGER INTLKDISABLE RELAY RELAY
MAIN BATTERY APU BATTERY
1 AIRPLANES WITH 10 KVA HMG
Electrical Load Distribution Block Diagram
Figure 1 (Sheet 2)
A73940
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757 MAINTENANCE MANUAL
AC ELECTRICAL LOAD DISTRIBUTION - ADJUSTMENT/TEST
_________________________________________________
1. General_______
A. This procedure has two tasks. The first task does an operational test. The second task does a system test.
B. The operational test uses only the airplane lights and EICAS indications.
C. The system test uses test equipment not found on the airplane
TASK 24-50-00-715-003
2. Operational Test - Electrical Power Distribution________________________________________________
A. References
(1)
AMM 24-22-00/201, Electrical Power - Control
(2)
AMM 27-61-00/201, Spoiler/Speedbrake Control System
B. Prepare for the Test
S 045-057
WARNING: DO THE DEACIVATION PROCEDURE FOR THE SPOILERS OR MOVE ALL
_______ PERSONS AND EQUIPMENT AWAY FROM THE SPOILERS. THE SPOILERS CAN RETRACT QUICKLY AND CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(1) Do the deactivation procedure for the spoilers (AMM 27-61-00/201) or move all persons and equipment away from the spoilers.
C. Do a test of the Electrical Power Distribution
S 715-056
(1) Do a test of the instrument bus voltage sensing units as follows:
(a)
Supply external power to the main AC buses (AMM 24-22-00/201).
(b)
Push the STATUS switch on the EICAS display select panel P9.
(c)
Make sure the EICAS message, CAPT INSTR XFER, does not show on the bottom display.
(d)
Open this P6 panel circuit breaker:
1) 6M16, CAPT PRIM INSTR BUS oA
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MAINTENANCE MANUAL
(e)
Make sure the EICAS message, CAPT INSTR XFER, shows on the bottom display.
(f)
Close this P6 panel circuit breaker:
1) 6M16, CAPT PRIM INSTR BUS oA
(g)
Make sure the EICAS message, F/O INSTR XFER, does not show on the bottom display.
(h)
Open this P6 panel circuit breaker:
1) 6M22, F/O PRIM INSTR BUS oA
(i)
Make sure the EICAC message, F/O INSTR XFER, shows on the bottom display.
(j)
Close this P6 panel circuit breaker:
1) 6M22, F/O PRIM INSTR BUS oA
S 865-012
(2)
Remove electrical power if it is not necessary (AMM 24-22-00/201).
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