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Alternate Electrical Source, or Section 05-04-30, APU Inflight Operation: Alternate
Electrical Source - ELWS (Loadmeter) / ASC 420 Procedures.
Failure of a portion of a converter may be indicated by one or more of the
following amber messages:
• L AC POWER FAIL
• L DC POWER FAIL
• R AC POWER FAIL
• R DC POWER FAIL
IF ANY ONE OF THE ABOVE MESSAGES IS DISPLAYED, PROCEED AS
FOLLOWS:
4. Affected Converter AC and DC Loads / Voltages..................................CHECK
5. ELECTRIC MASTER LEFT PWR (Or RIGHT PWR) Switch......OFF, WAIT TEN
(10) SECONDS, THEN ON
If voltage is produced, automatic transfer to the correct source will occur.
IF VOLTAGE IS NOT PRODUCED AND L-R DC POWER FAIL MESSAGE REMAINS:
6. Affected Converter ..........................................................................AS DESIRED
If 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:
7. Affected Converter..........................................................................SELECT OFF
05-07-50: Electrical Load Warning System
IN THE EVENT APU ELECTRICAL LOAD IS OBSERVED IN THE 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 THE HIGH AMBER
RANGE, PROCEED AS FOLLOWS:
3. GALLEY MASTER...........................................................................................OFF
IF CONDITION PERSISTS:
4. CABIN MASTER..............................................................................................OFF
05-07-60: Flight With One Electrical System Inoperative - Secondary
Failures Using ELWS Procedures, Or ASC 420 And SN 1430
And Subs
1. Alternator Failures:
A. APU Alternator Failure Or APU Flameout:
(1) The ESSENTIAL AC BUS and ESSENTIAL DC BUS will
automatically transfer to the operative converter.
OPERATING MANUAL
EXPANDED ABNORMAL / EMERGENCY PROCEDURES 05-07-00
Page 7
October 11/01
Revision 5
(2) The MAIN AC BUS and MAIN DC BUS, up to this point powered by
the APU Alternator, will become unpowered at the time of failure due
to EPMP BUS switch configuration.
(3) Power to failed buses may be regained by selecting AUTO on EPMP
for those buses.
(4) The remaining converter will be capable of powering the airplane for
the remainder of the flight.
(5) If the APU has flamed out, the pilot may elect to descend to 15,000
ft, restart the APU and, after return to cruise altitude, monitor APU
electrical load.
(6) Allow time during descent for windshield heat to defog windows.
B. Alternator / Converter Failure:
(1) The ESSENTIAL AC BUS and ESSENTIAL DC BUS will
automatically transfer to the APU Alternator and TRU.
(2) The MAIN AC BUS and MAIN DC BUS, up to this point powered by
the Converter, will become unpowered at the time of failure due to
EPMP BUS switch configuration.
(3) DO NOT attempt to repower failed buses by switching their power
source to APU unless airplane altitude is 30,000 ft or less. The APU
Alternator is not capable of powering the 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 for those buses. Accomplish
this at or below 30,000 ft.
(5) Allow time during descent for windshield heat to defog windows.
2. APU Operating Envelope: In Flight - ELWS Operative
See Figure 1 for airplanes SN 1156 and subsequent, SN 1000 through 1155 with
APU Loadmeter installed or removed by ASC 420, and SN 1430 and subsequent.
Parameter: Guaranteed Starting: Running:
Altitude: 15,000 ft and below 35,000 ft and below
Airspeed: 250 KCAS maximum VMO/MMO maximum
OPERATING MANUAL
05-07-00 EXPANDED ABNORMAL / EMERGENCY PROCEDURES
Page 8
October 11/01
Revision 5
ELWS APU Alternator Operating Envelope: SN 1156 and Subsequent, SN 1000
Through 1155 With APU Loadmeter Installed or Removed By ASC 420, and SN1430
and Subs
Figure 1
OPERATING MANUAL
EXPANDED ABNORMAL / EMERGENCY PROCEDURES 05-07-00
Page 9
October 11/01
Revision 5
ELWS APU Alternator Electrical Load: SN 1156 and Subsequent, SN 1000 Through
1155 With APU Loadmeter Installed or Removed By ASC 420, and SN1430 and Subs
Figure 2
OPERATING MANUAL
05-07-00 EXPANDED ABNORMAL / EMERGENCY PROCEDURES
　
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