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.......................................................................................................................PUSH
NOTE:
If RIGHT MAIN AC BUS is unpowered, leave ESS AC
BUS in AUTO.
2. AC RESET Switch Light..............................................................................PUSH
IF RESET LIGHT EXTINGUISHES AND POWER IS RESTORED TO THE BUS,
PERFORM STEPS 3 AND 4.
IF LIGHT EXTINGUISHES MOMENTARILY WHILE THE BUS CYCLES THROUGH
ITS POSSIBLE POWER SOURCES, THEN RE-ILLUMINATES, PERFORM STEPS 5
THROUGH 10.
IF RESET LIGHT REMAINS ILLUMINATED, PERFORM STEPS 11 THROUGH 16.
IF RESET LIGHT EXTINGUISHES AND POWER IS RESTORED TO THE BUS:
3. If Fault Indication Was LEFT BUS: ESS AC BUS AUTO Switch Light...PUSH
4. Loads .................................................MONITOR FOR REMAINDER OF FLIGHT
IF LIGHT EXTINGUISHES MOMENTARILY WHILE THE BUS CYCLES THROUGH
ITS POSSIBLE POWER SOURCES, THEN RE-ILLUMINATES:
5. Relevant AC MAIN Feeder CBs (PDB) .......................................................PULL
6. AC RESET Switch Light..............................................................................PUSH
7. AC MAIN Feeder CBs (PDB).........................................RESET ONE AT A TIME
Allow sufficient time for fault to recur.
AFTER FAULT ISOLATION:
8. Applicable CB ...............................................................LEAVE PULLED (OPEN)
9. AC RESET Switch Light..............................................................................PUSH
10. If Fault Indication Was LEFT BUS: ESS AC BUS AUTO Switch Light...PUSH
IF RESET LIGHT REMAINS ILLUMINATED:
11. Power Availability For Failed Bus...........................................................VERIFY
Verify availability of power for failed bus by displaying LEFT, RIGHT and, if APU is
running, AUX, voltages/frequencies on the EPMP AC VOLTS / FREQ meter
display.
IF FAILED BUS IS LEFT AC BUS:
12. As Available: LEFT MAIN, RIGHT MAIN or AUX.......................................PUSH
IF FAILED BUS IS RIGHT AC BUS:
13. As Available: RIGHT MAIN, LEFT MAIN or AUX.......................................PUSH
OPERATING MANUAL
05-07-00 EXPANDED ABNORMAL / EMERGENCY PROCEDURES
Page 16
October 11/01
Revision 5
14. AC RESET Switch Light..............................................................................PUSH
IF AC RESET SWITCH LIGHT EXTINGUISHES:
15. Loads .................................................MONITOR FOR REMAINDER OF FLIGHT
IF RESET LIGHT REMAINS ILLUMINATED:
16. Loss of Equipment Powered by Dead Bus...............................................NOTE
05-07-74: Main DC Bus Fault Indicated
1. If LEFT MAIN DC BUS Is Unpowered: ESS DC BUS RIGHT MAIN Switch Light
.......................................................................................................................PUSH
NOTE:
If RIGHT MAIN DC BUS is unpowered, leave ESS DC
BUS in AUTO.
2. DC RESET Switch Light..............................................................................PUSH
IF RESET LIGHT EXTINGUISHES AND POWER IS RESTORED TO THE BUS,
PERFORM STEPS 3 AND 4.
IF LIGHT EXTINGUISHES MOMENTARILY WHILE THE BUS CYCLES THROUGH
ITS POSSIBLE POWER SOURCES, THEN RE-ILLUMINATES, PERFORM STEPS 5
THROUGH 10.
IF RESET LIGHT REMAINS ILLUMINATED, PERFORM STEPS 11 THROUGH 16.
IF RESET LIGHT EXTINGUISHES AND POWER IS RESTORED TO THE BUS:
3. If Fault Indication Was LEFT BUS: ESS DC BUS AUTO Switch Light...PUSH
4. Loads .................................................MONITOR FOR REMAINDER OF FLIGHT
IF LIGHT EXTINGUISHES MOMENTARILY WHILE THE BUS CYCLES THROUGH
ITS POSSIBLE POWER SOURCES, THEN RE-ILLUMINATES:
5. Relevant DC MAIN Feeder CBs (PDB) .......................................................PULL
6. DC RESET Switch Light..............................................................................PUSH
7. DC MAIN Feeder CBs (PDB).........................................RESET ONE AT A TIME
Allow sufficient time for fault to recur.
AFTER FAULT ISOLATION:
8. Applicable CB ...............................................................LEAVE PULLED (OPEN)
9. DC RESET Switch Light..............................................................................PUSH
10. If Fault Indication Was LEFT BUS: ESS DC BUS AUTO Switch Light...PUSH
IF RESET LIGHT REMAINS ILLUMINATED:
11. Power Availability For Failed Bus...........................................................VERIFY
Verify availability of power for failed bus by displaying LEFT, RIGHT and, if APU is
running, AUX, voltages/frequencies on the EPMP DC VOLTS / FREQ meter
display.
IF FAULTY BUS IS LEFT DC BUS:
12. As Available: LEFT MAIN, TRU or RIGHT MAIN.......................................PUSH
　
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