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If voltage is produced, automatic transfer back to this source will
occur.
If DC voltage is not produced and L-R DC POWER FAIL
message remains, converter operation may be continued. If AC
voltage is not produced and L-R AC POWER FAIL message
remains, turn converter OFF.
END
Electrical Load Warning System - ELWS AFM 3-07-50
In the event APU electrical load is observed in low amber range,
proceed as follows:
1. CABIN MASTER ........................................................................ ON
If condition persists:
2. GALLEY MASTER ..................................................................... ON
In the event APU electrical load is observed in high amber range,
proceed as follows:
1. GALLEY MASTER ....................................................................OFF
If condition persists:
2. CABIN MASTER .......................................................................OFF
END
Quick Reference Handbook
REVISION 7 ABNORMAL / EMERGENCY PROCEDURES
May 30/02 Page EA - 9
Flight With One Electrical System Inoperative -
Secondary Failures Using ELWS Procedures or With
ASC 420 and SN 1430 and Subs AFM 3-07-60
APU Alternator Failure or APU Flameout:
1. Essential AC and DC buses will automatically transfer to operative
converter.
2. Main AC and DC buses powered by APU will be unpowered at time
of failure due to configuration of EPMP bus switches.
3. Power to failed buses may be regained by selecting AUTO on
EPMP panel for those buses.
4. Remaining converter will be capable of powering airplane for
remainder of flight.
5. If APU has flamed out, the pilot may elect to descend to 15,000 ft.,
restart APU, return to cruise altitude, and monitor APU electrical
load.
6. Allow time during descent for windshield heat to defog windows.
Alternator / Converter Failure:
1. Essential AC and DC buses will automatically transfer to APU
alternator and TRU.
2. Main AC and DC buses powered by Converter will be unpowered at
time of failure due to configuration of EPMP bus switches.
3. DO NOT attempt to repower failed buses by switching their power
source to APU unless airplane altitude is 30,000 ft. or less. APU
alternator is not capable of powering entire airplane above 30,000
ft.
4. On descent for approach and landing, power to failed buses may
be regained by Selecting AUTO on EPMP panel for those buses.
Accomplish this at or below 30,000 ft.
5. Allow time during descent for windshield heat to defog windows.
END
Quick Reference Handbook
ABNORMAL / EMERGENCY PROCEDURES REVISION 7
Page EA - 10 May 30/02
Operational Procedures With Converter / Alternator
Inoperative - ELWS Installed OM 09-03-60
THIS PROCEDURE IS TO BE USED IN ACCORDANCE WITH GIV
MMEL “M” AND “O” PROCEDURES.
For departure operations with one (1) converter / alternator
inoperative, complete the following steps:
After Starting Engines:
1. START MASTER ......................................................................OFF
If LEFT converter / alternator is inoperative, complete Steps 2
through 7, omit Steps 8 through 13 and proceed to Step 14. If
RIGHT converter / alternator is inoperative, proceed to Step 8.
If LEFT converter / alternator is inoperative:
2. ELECTRICAL MASTER RIGHT PWR....................................... ON
3. ELECTRICAL MASTER AUX PWR........................................... ON
4. LEFT MAIN AC APU / EXT...................ON (MANUALLY SELECT)
5. R MAIN AC RIGHT ...............................ON (MANUALLY SELECT)
6. L MAIN DC TRU / EXT..........................ON (MANUALLY SELECT)
7. R MAIN DC RIGHT ...............................ON (MANUALLY SELECT)
If RIGHT converter / alternator is inoperative:
8. ELECTRIC MASTER LEFT PWR.............................................. ON
9. ELECTRIC MASTER AUX PWR ............................................... ON
10. LEFT MAIN AC LEFT............................ON (MANUALLY SELECT)
11. R MAIN AC APU / EXT .........................ON (MANUALLY SELECT)
12. L MAIN DC LEFT ..................................ON (MANUALLY SELECT)
13. R MAIN DC TRU / EXT.........................ON (MANUALLY SELECT)
For EITHER converter / alternator inoperative, proceed as follows:
14. ESS AC AUTO........................................................................... ON
15. ESS DC AUTO........................................................................... ON
Continued on next page →
Quick Reference Handbook
REVISION 7 ABNORMAL / EMERGENCY PROCEDURES
May 30/02 Page EA - 11
Operational Procedures With Converter / Alternator Inoperative –
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