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B. If failed bus is LEFT AC BUS, then:
As Available, LEFT MAIN, RIGHT MAIN, or AUX.............PUSH
C. If failed bus is RIGHT AC BUS, then:
As available, RIGHT MAIN, LEFT MAIN, or AUX .............PUSH
D. AC RESET Switchlight ......................................................PUSH
E. If RESET Switchlight extinguishes, then:
Loads.......................MONITOR FOR REMAINDER OF FLIGHT
F. If RESET Switchlight remains ON, then:
Loss Of Equipment Powered By Dead Bus ......................NOTE
Main DC Bus Fault Indicated:
If LEFT MAIN DC BUS is unpowered:
1. Essential DC BUS RIGHT Switchlight................................... PUSH
NOTE: If RIGHT MAIN DC BUS is unpowered, leave Essential DC Bus
in AUTO.
2. DC RESET Light ...................................................................PUSH
3. If RESET light extinguishes and power is restored to the bus:
A. If fault indication was LEFT BUS, then:
Essential DC Bus AUTO Switchlight .................................. PUSH
B. Monitor loads for remainder of flight.
4. If RESET Light extinguishes momentarily, while the bus cycles
through available sources, then re-illuminates:
A. Relevant DC Main Feeder Circuit Breakers (PDB) ............PULL
B. DC RESET Switchlight ......................................................PUSH
C. RESET Main Feeder circuit breakers one at a time. Allow
sufficient time for fault to recur.
Continued on next page →
DC
RESET
SEL
AUTO LEFT
MAIN
ON
RIGHT
MAIN
BATT
ESS DC BUS
Quick Reference Handbook
REVISION 7 ABNORMAL / EMERGENCY PROCEDURES
May 30/02 Page EA - 19
Bus Fault - AC or DC RESET Light On, ctd… AFM 3-07-70
Main DC Bus Fault Indicated, ctd…
D. After fault isolation, then:
Applicable Circuit Breaker .................. LEAVE PULLED (OPEN)
E. DC RESET Switchlight ......................................................PUSH
F. If fault indication was LEFT BUS, then:
Essential DC Bus AUTO Switchlight .................................PUSH
5. If RESET Light remains ON:
A. Verify availability of power for faulty bus by selecting Volt/Freq.
Meter to LEFT, RIGHT; and, if APU is running, AUX.
B. If faulty bus is LEFT DC BUS, then:
As available, LEFT MAIN, TRU, or RIGHT MAIN .............PUSH
C. If faulty bus is RIGHT DC BUS, then:
As available, RIGHT MAIN, TRU, or LEFT MAIN .............PUSH
D. DC RESET Switchlight ......................................................PUSH
E. If RESET Switchlight extinguishes, then:
Loads...................... MONITOR FOR REMAINDER OF FLIGHT
F. If RESET Switchlight remains ON, then:
Loss Of Equipment Powered By Dead Bus.......................NOTE
END
Quick Reference Handbook
ABNORMAL / EMERGENCY PROCEDURES REVISION 7
Page EA - 20 May 30/02
Battery Or Battery Charger Failure AFM 3-07-80
CHGR FAIL warning light illuminated:
1. Appropriate Main AC Bus Power ........................................ CHECK
2. Affected Battery Current/Voltage ................................... OBSERVE
If meter reading is abnormal:
3. BATT CHGR CB (PDB) ..........................................................PULL
CHRG FAIL warning light will remain ON.
4. After 3 - 5 minutes, BATT CHGR CB (PDB)........................RESET
If battery does not charge:
5. BATT CHGR CB (PDB) ..........................................................PULL
6. Battery Switch On Affected Side ...............................................OFF
NOTE: OFF only if battery is discharging. Reinstate if battery power is
required.
END
Essential DC Bus On Battery Power AFM 3-07-90
NOTE: If the ESS DC BUS AUTO, LEFT MAIN and BATT switch capsules
are illuminated without the BATT 1 and 2 switches illuminated or the “BATT
ON BUS” message (SPZ 8400)/capsule (SPZ 8000) illuminated, the K20/K22
relay has experienced a failure of one of the two relay poles. Report for
maintenance action.
If DC Reset Light is ON, see Bus Fault - AC Or DC RESET Light On,
page EA-13. If DC Reset Light is NOT ON:
1. Left and/or Right Main DC Bus ......................VERIFY POWERED
A. If buses are not powered, determine reason and re-power the
buses.
B. If buses are powered, verify ESS DC Bus switch selection on
EPMP is AUTO.
C. DC Reset Switch..........................................................PRESS
D. Hard select ESS DC to Left, then Right, then back to AUTO.
Pause between each step to determine if power to ESS DC
BUS is switched from BATT to either Left or Right Main Bus.
Continued on next page →
Quick Reference Handbook
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