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ON with APU alternator operating
APU EXCEEDANCE FWC has recorded an APU operating limit exceedance
5. Circuit Breakers (CBs):
Circuit Breaker Name CB Panel Location Power Source
APU CONT P G-10 (1)
L-9 (2)
BATT #1 BUS B / BATT #2
BUS B / ESS 28V DC
APU START P H-10 ESS 28V DC
APU PWR #1 P J-10 BATT #1 BUS B
APU PWR #2 P K-10 BATT #2 BUS B
APU PWR #3 P L-10 ESS 28V DC
APU FIRE WARN P B-4 (3)
A-4 (4)
ESS 28V DC
APU FIRE EXT P I-10 ESS 28V DC
AIR INLET DOOR PO C-11 ESS 28V DC
ELWS #1 (5) PO A-9 ESS 28V DC (6)
ELWS #2 (7) PO BÐ9 ESS 28V DC(8)
NOTE(S):
(1) SN 1001, 1018 & subs
(2) SN 1000, 1002-1017
(3) SN 1280-1309, 1436 & subs
(4) SN 1000-1279, 1310-1435
(5) SN 1034, 1156-1429
(6) L MAIN 28V DC for SN 1183-1207
(7) SN 1034, 1156-1429
(8) R MAIN 28V DC for SN 1183-1207
6. Limitations:
A. Flight Manual Limitations:
(1) APU Operating Limits:
(a) General:
The APU can be operated on the ground, during takeoff, in
ßight and during landing. In ßight it is an optional source of
electrical power via the AUX PWR switch instead of one or
both engine-driven alternators. The APU cannot be used to
supply pressurization airßow in ßight.
(b) Maximum Permissible EGT:
• Up to 60% RPM during start: 988¡C
• 60% RPM to 100% during start: 821¡C to 732¡C
OPERATING MANUAL
PRODUCTION AIRCRAFT SYSTEMS 2A-49-00
Page 13
October 11/02
Revision 8
(linear decrease)
• Running: 732¡C
(c) Maximum Rotor Speed:
The maximum rotor speed for all conditions is 110%.
(2) APU Starting Limits:
(a) When Powered By Airplane Batteries:
Continuous operation of the APU starter when powered by
airplane batteries is limited to thirty (30) seconds per start
with a maximum of three (3) consecutive start attempts.
Before attempting another start, allow twenty (20) minutes for
starter cool-down. Three (3) additional start attempts may be
made, after which a one (1) hour cool down period must be
observed before the next full starter cycle is commenced.
(b) When Powered By An External DC Power Source:
Continuous operation of the APU starter when powered by an
external DC power source is limited to Þfteen (15) seconds
per start with a maximum of two (2) consecutive start
attempts. Before attempting another start, allow twenty (20)
minutes for starter cool-down. Two (2) additional start
attempts may be made and, if unsuccessful, a one (1) hour
cool down period must be observed before the next full
starter cycle is commenced.
NOTE:
An inspection is required within ten (10) APU operating
hours if the APU is operated above 30,000 ft for more
than one (1) hour during ßight, or if the APU is
operated above 30,000 ft more than Þve (5) times.
Refer to the APU Maintenance Manual for speciÞc
inspection requirements.
NOTE:
Successful consecutive starts are limited to six (6) at
ten (10) minute intervals per start.
NOTE:
See APU OPERATING ENVELOPE (SN 1000
Through 1155 Without APU Loadmeter), Figure 5 or
ELWS APU ALTERNATOR OPERATING ENVELOPE
(SN 1156 and Subsequent, SN 1000 Through 1155
With APU Loadmeter Installed or Removed By ASC
420, and SN 1430 and Subs), Figure 7.
(3) APU Alternator Electrical Load:
(a) Airplanes SN 1000 Through SN 1155 Without APU
Loadmeter Installed:
The APU alternator can deliver 100% electrical power (30
kVA) on ground or in ßight from Sea Level to 22,000 ft. From
OPERATING MANUAL
2A-49-00 PRODUCTION AIRCRAFT SYSTEMS
Page 14
October 11/02
Revision 8
22,000 ft to 30,000 ft, the limit load decreases linearly to 50%
electrical power (15 kVA). Load shedding may be required.
See APU ALTERNATOR ELECTRICAL LOAD (SN 1000
Through 1155 Without APU Loadmeter), Figure 4.
(b) Airplanes SN 1156 And Subs, And SN 1000 Through SN
1155 With APU Loadmeter Installed:
The Increased Altitude APU alternator can deliver 100%
electrical power (30 kVA) on ground or in ßight from Sea
Level to 30,000 ft. From 30,000 ft to 35,000 ft, the limit load
decreases to 67% electrical power (20 kVA). Load shedding
may be required. See ELWS APU ALTERNATOR
ELECTRICAL LOAD (SN 1156 and Subsequent, SN 1000
Through 1155 With APU Loadmeter Installed or Removed By
ASC 420, and SN 1430 and Subs), Figure 6.
(c) Airplanes SN 1156 And Subs, SN 1000 Through SN 1155
With ASC 420 (Removal Of APU Loadmeter)
Incorporated, and SN 1430 And Subs:
With the ram air scoop installed over the APU inlet door, the
　
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