(g)
Push the STATUS switch on the EICAS select panel.
(h)
Make sure the CAPT INSTR XFER, and the TR UNIT messages show on the lower EICAS display unit.
(i)
Close this circuit breaker:
1) 6M16 CAPT PRIM INSTR BUS oA
(j)
Make sure CAPT INSTR XFER and TR UNIT do not show on the lower EICAS display unit.
(k)
Open this circuit breaker:
1) 6M16 F/O PRIM INSTR BUS oA
(l)
Push the STATUS switch on the EICAS select panel.
(m)
Make sure F/O INSTR XFER and TR UNIT show on the lower EICAS display unit.
(n)
Close this circuit breaker:
1) 6M22 F/O PRIM INSTR BUS oA
(o)
Make sure F/O INSTR XFER and TR UNIT do not show on the lower EICAS display unit.
S 845-056
(5) Restore airplane to normal.
(a)
Remove the IDG power from the right main ac buses.
(b)
Remove the external power from the left main ac bus.
(c)
Make sure the BAT switch (P5) is set to the OFF position.
(d)
Attach a DO-NOT-OPERATE tag on the BAT switch (P5).
WARNING: DO NOT OPEN THE MAIN POWER DISTRIBUTION PANEL P6 WITH
_______ POWER ON THE AIRPLANE. HIGH VOLTAGE IN THE PANEL CAN CAUSE INJURY.
(e)
Open the P6 panel.
(f)
Set the switch on the adapter for the isolation request relay (installed on the P6) to the OFF position.
(g)
Remove the adapter for the isolation request relay from the P6 panel.
(h)
Install the isolation request relay, K122 in the P6 panel.
(i)
Close the P6 panel.
(j)
Remove the DO-NOT-OPERATE tag from the BAT switch (P5).
TASK 24-22-00-745-058
4. BPCU BITE/Periodic Test
_______________________
NOTE: This is a scheduled maintenance task.
____
A. References
(1) AMM 24-22-00/201, Electrical Power - Control
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757 MAINTENANCE MANUAL
B. Prepare for the Test
S 865-065
(1) Supply electrical power to the 115V ac buses (AMM 24-22-00/201).
NOTE: The BPCU BITE procedure can be run with battery power.
____
C. Procedure
S 745-059
(1) Do the PERIODIC TEST:
(a) Momentarily push the PERIODIC TEST switch on the BPCU (E5-3).
1) Make sure these indications show on the BPCU: a) EXTERNAL POWER SYSTEM b) OK c) LEFT GEN POWER SYSTEM d) OK e) RIGHT GEN POWER SYSTEM f) OK g) APU GEN POWER SYSTEM h) OK i) LAST FLT 00 END OF DATA j) FOR PREVIOUS FLT PUSH NOW
NOTE: The above sequence is shown when the power
____ system has no fault. If a fault is found, the applicable fault message will be displayed in place of the OK message.
2) Repair any message which is displayed on the BPCU.
3) If it is necessary to see this display again, stop until the FOR PREVIOUS FLT PUSH NOW indication goes off. Then, momentarily push the PERIODIC TEST switch.
(b) Push the RESET switch on the front of the BPCU.
1) Make sure the indication sequence shows on the BPCU: a) EXTERNAL POWER SYSTEM b) LEFT GEN POWER SYSTEM c) RIGHT GEN POWER SYSTEM d) APU GEN POWER SYSTEM
S 865-066
(2) Remove electrical power if it is not necessary (AMM 24-22-00/201).
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1.
2.
3.
757 MAINTENANCE MANUAL
ELECTRICAL SYSTEM CONTROL PANEL - REMOVAL/INSTALLATION
_______________________________________________________General
_______
A. This procedure has two tasks. The first task removes the electrical system control panel from the airplane. The second task installs the electrical system control panel on the airplane.
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