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− END −
No
(2) All AC loads.................................................................MONITOR
END
ABNORM 6-4
REV 75, Feb 17/09
QUICK REFERENCE HANDBOOK
PSP 604-15
ELECTRICAL
MALFUNCTIONS
APU GEN OVLD
APU GEN OVLD
(1) GEN load(s).................................................................MONITOR
(2) AC loads....................................................................... REDUCE
as necessary.
END
BATTERY BUS
BATTERY BUS
(1) Land at the nearest suitable airport.
(2) BUS INOP LIST............................................................. REVIEW
(See Page ABNORM 6–8)
END
DC BUS 1 (2)
DC BUS 1 or DC BUS 2
(1) MAIN BUS TIE ................................................................ CLOSE
DC BUS 1 (2) caution message persists:
Yes
(2) BUS INOP LIST..................................................... REVIEW
(See Page ABNORM 6–8)
− END −
No
(2) No further action required.
END
DC ESS BUS
DC ESS BUS
(1) Land at the nearest suitable airport.
(2) BUS INOP LIST............................................................. REVIEW
(See Page ABNORM 6–8)
END
ABNORM 6-5
REV 66, Feb 01/07
QUICK REFERENCE HANDBOOK
PSP 604-15
ELECTRICAL
MALFUNCTIONS
GEN 1 (2) OFF
GEN 1 OFF or GEN 2 OFF
(1) Affected GEN .......................................................... OFF/RESET
then ON.
GEN 1 (2) OFF caution message persists:
Yes
(2) Affected GEN................................................................ OFF
NOTE
1. With generator 1 shut down, hydraulic pump
2B is load shed; with generator 2 shut down,
hydraulic pump 1B is load shed. HYD PUMP
1B (2B) caution message will remain on.
2. During single generator operations, AC utility
busses are shed, unless on ground with flaps
at 0°.
(3) APU (if available)......................................................START
when at or below 20,000 feet.
On airplanes 5301 to 5630 without SB 604–49–006 or
604–49–009:
(2) APU (if available)......................................................START
when at or below 15,000 feet.
On airplanes 5301 to 5630 without SB 604–49–006 or
604–49–009:
CAUTION
Use of the APU generator in flight
is not permitted unless both main
generators have failed or are
off-line.
(3) APU GEN ....................................................................... ON
− END −
No
(2) AC voltage, load and frequency ..................................MONITOR
END
GEN 1 (2) OVLD
GEN 1 OVLD or GEN 2 OVLD
(1) AC loads .....................................................................MONITOR
and load shed, as necessary.
END
ABNORM 6-6
REV 71, Oct 31/07
QUICK REFERENCE HANDBOOK
PSP 604-15
ELECTRICAL
MALFUNCTIONS
MAIN BATT OFF
MAIN BATT OFF
(1) BATT MASTER .........................................................CHECK ON
MAIN BATT OFF caution message persists:
Yes
(2) Main battery voltage ............................................MONITOR
(3) Affected airplane systems ..................................... REVIEW
• Back-up power to DCU 2 and 3 (if installed), is
not available;
• Engine APR system is inoperative;
• L and R ENG MISCOMP caution messages are
displayed.
− END −
No
(2) No further action required.
END
DC EMER BUS
DC EMER BUS
(1) Affected airplane systems ............................................. REVIEW
• Engine and APU fire extinguishing systems are inoperative:
• Firex bottles are inoperative,
• APU fuel feed shut-off valves will not close, and
• Engine hydraulic shut-off valves will not close.
(2) Land at the nearest suitable airport.
END
ABNORM 6-7
REV 71, Oct 31/07
QUICK REFERENCE HANDBOOK
PSP 604-15
ELECTRICAL
MALFUNCTIONS
BUS INOP LIST
NOTE: The bus inoperative list covers systems that are
important to the approach and landing phases of flight. The list
covers items that are NOT available. The list does not cover all
electrically controlled and/or powered systems and is not a
complete check of all circuit breaker panels to determine
affected systems.
SYSTEM SUBSYSTEM
AC BUS
1
AC BUS
2
DC BUS
1
DC BUS
2
AC ESS
BUS
DC ESS
BUS
DC
BATT
　
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