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OPERATING MANUAL
EXPANDED ABNORMAL / EMERGENCY PROCEDURES 05-04-00
Page 3
May 31/01
Revision 4
APU Alternator Electrical Load: SN 1000 Through 1155 Without APU Loadmeter
Figure 1
OPERATING MANUAL
05-04-00 EXPANDED ABNORMAL / EMERGENCY PROCEDURES
Page 4
May 31/01
Revision 4
APU Operating Envelope: SN 1000 Through 1155 Without APU Loadmeter
Figure 2
OPERATING MANUAL
EXPANDED ABNORMAL / EMERGENCY PROCEDURES 05-04-00
Page 5
May 31/01
Revision 4
05-04-30: APU Inflight Operation: Alternate Electrical Source - ELWS
(Loadmeter) / ASC 420 Procedures
FOR AIRPLANES SN 1156 AND SUBS, SN 1000 THROUGH 1155 WITH APU
LOADMETER INSTALLED OR REMOVED BY ASC 420, AND 1430 AND SUBS
In the event supplemental electrical power is required in flight due to failure of an
engine or alternator/converter system, the APU alternator may be used as an
electrical power source.
TO START APU IN FLIGHT:
1. Altitude / Airspeed .....................15,000 FT OR BELOW / 250 KCAS OR LESS
2. Battery 1 and 2 Switches ................................................................................ON
3. APU Fire Warning .....................................................................................CHECK
4. APU Master Switch ..........................................................................................ON
5. APU Start Button .........................................................PRESS (MOMENTARILY)
CAUTION
APU STARTER IS LIMITED TOTHREE (3) CONSECUTIVE
START ATTEMPTS OF THIRTY (30) SECONDS
DURATION, FOLLOWED BY TWENTY (20) MINUTE
COOL DOWN PERIOD. THEN THREE (3)
ADDITIONAL START ATTEMPTS MAY BE MADE,
AFTER WHICH A ONE (1) HOUR COOL DOWN
PERIOD MUST BE OBSERVED.
WHEN APU IS UP TO SPEED (100% ?3%):
6. Electric Master Auxiliary Power......................................................................ON
7. Auxiliary Power Loadings ................................................WITHIN LIMITATIONS
See limitations contained in Section 01-49-00: Auxiliary Power Unit (APU).
Observe load limitations shown in Figure 3.
NOTE:
If flight is continued above 30,000 ft, the following
steps must be accomplished to ensure continuous
APU operation.
IF LEFT CONVERTER/ALTERNATOR IS INOPERATIVE:
8. ELECTRIC MASTER RIGHT PWR ...................................................................ON
9. L MAIN AC BUS APU/EXT.........................................ON (MANUALLY SELECT)
10. R MAIN AC BUS RIGHT ............................................ON (MANUALLY SELECT)
11. L MAIN DC BUS TRU/EXT.........................................ON (MANUALLY SELECT)
12. R MAIN DC BUS RIGHT ............................................ON (MANUALLY SELECT)
IF RIGHT CONVERTER/ALTERNATOR IS INOPERATIVE:
13. ELECTRIC MASTER LEFT PWR .....................................................................ON
14. L MAIN AC BUS LEFT ...............................................ON (MANUALLY SELECT)
15. R MAIN AC BUS APU/EXT ........................................ON (MANUALLY SELECT)
16. L MAIN DC BUS LEFT...............................................ON (MANUALLY SELECT)
17. R MAIN DC BUS TRU/EXT ........................................ON (MANUALLY SELECT)
OPERATING MANUAL
05-04-00 EXPANDED ABNORMAL / EMERGENCY PROCEDURES
Page 6
May 31/01
Revision 4
FOR EITHER CONVERTER/ALTERNATOR INOPERATIVE, PERFORM STEPS 18
THROUGH 22:
18. ESS AC BUS AUTO..........................................................................................ON
19. ESS DC BUS AUTO..........................................................................................ON
20. Electrical Loadmeter (If Installed) ..................................................................ON
21. Electrical Loadmeter (If Installed) Green Arc ........................................CHECK
If the APU Loadmeter is observed in either the low amber range or high amber
range, see Section 05-07-50, Electrical Load Warning System.
FOR AIRPLANES SN 1430 AND SUBS AND AIRPLANES WITH ASC 420:
22. Windshield Heat............................................................................AS REQUIRED
IF LEFT CONVERTER HAS FAILED:
A. RF/LS Switch........................................................................................OFF
IF RIGHT CONVERTER HAS FAILED:
B. LF/RS Switch........................................................................................OFF
APU OPERATING ENVELOPE IN FLIGHT - ELWS OPERATIVE / ASC 420:
See Figure 4.
Parameter: Guaranteed Starting: Running:
Altitude: 15,000 ft and below 35,000 ft and below
Airspeed: 250 KCAS maximum VMO/MMO maximum
　
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