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Should EGT reach the limit, the ECU will reduce bleed air flow by modulating the bleed valve toward the closed position
to prevent over temperature.
BLEED VALVE
The APU bleed valve controls airflow to the aircraft bleed system and protects the APU from an overtemperature condition.
The valve is controlled electrically and the valve mechanism operates a butterfly valve pneumatically. When the bleed
VALVE is open, the ECU adjusts the butterfly plate position to supply the correct quantity of bleed air. These adjustments
are related to the required quantity of bleed air and APU EGT.
SURGE CONTROL VALVE
The surge control valve is automatically controlled by the ECU. The surge valve is commanded open when the APU is
supplying electrical loads at flight altitudes above 15 000 ft. This function reduces APU surge potential when operating in
an unloaded condition.
BLEED AIR AVAILABILITY
For the ECU to energize the bleed-air supply system, the APU must be more than 95% of its maximum speed.
BLEED AIR LIMITATIONS
Refer to the Approved Airplane Flight Manual for bleed air limitations.
AUXILIARY POWER UNIT
Sep 13/2004 Flight Crew Operating Manual Volume 2
REV 1 CSP 100-6 05-01-09
CONTROL AND INDICATIONS
DESCRIPTION
The APU control panel contains a single three position switch with OFF, RUN and START positions.
For ground operations, a remote cutoff switch is located on the right side of the aircraft, aft of the wing and behind the
electrical connection assess door.
DC electrical power provided by the APU generator is controlled from the ELECTRICAL control panel. Bleed-air services
are controlled from the AIR COND/BLEED control panel.
APU system operation and fault presentation is provided on the EICAS pages. The FUEL, ECS, ELECTRICAL synoptic
pages monitor the APU system and services.
EXTERNAL POWER CONTROL PANEL
CFO0503002_003
APU
OFF START
RUN
CFO0501002_006
EXTERNAL POWER
CONTROL PANEL
ON
Gnd
Service EXT DC
AVAIL
IN USE
APU Shutdown
Lamp
Test
AUXILIARY POWER UNIT
Volume 2 Flight Crew Operating Manual Sep 13/2004
05-01-10 CSP 100-6 REV 1
CONTROLS AND INDICATIONS (Cont)
AIR COND/BLEED CONTROL PANEL
The APU bleed selection can be controlled from the AIR COND/BLEED panel. and the bleed valve position is displayed
on the ECS synoptic page.
AIR SOURCE
NORM
OFF PACK ONLY
AIR COND / BLEED
TRIM AIR
ONLY
COCKPIT
COLD HOT
RAM AIR
ON
XBLEED R BLEED
OFF
MAN TEMP
ON
CABIN
COLD HOT
APU
ON
L BLEED
OFF
CFO0202002_003
REV 1
AUXILIARY POWER UNIT
May 06/2005 Flight Crew Operating Manual Volume 2
REV 2 CSP 100-6 05-01-11
CONTROL AND INDICATIONS (Cont)
ELECTRICAL CONTROL PANEL
The APU generator can be controlled by switches located on the ELECTRICAL control panel.
Shown with optional Hydraulic Motor Generator (HMDG) system.
L BATT EXT PWR R BATT
OFF
AVAIL
ON
ELECTRICAL
OFF OFF
OFF
ON
BUS TIE
L GEN APU GEN R GEN
R ESS
R MAIN R AUX
L ESS
L AUX L MAIN
STBY
INST
L BATT EXT PWR R BATT
OFF
AVAIL
ON
ELECTRICAL
OFF OFF
OFF
ON
BUS TIE
L GEN APU GEN R GEN
R ESS
R MAIN R AUX
L ESS
L AUX L MAIN
STBY
INST
OFF
ON
HYD GEN
REV 2
AUXILIARY POWER UNIT
Volume 2 Flight Crew Operating Manual Sep 13/2004
05-01-12 CSP 100-6 REV 1
CONTROLS AND INDICATIONS (Cont)
ELECTRICAL SYNOPTIC PAGE
CFO0701002_007
CAS
CKLST SKIP
FRMT TFC TR/WX ENTER SUMRY
A/ICE FLT FUEL HYD
L R
ECS
600 600
93.0 61.0
NI
MACH
HOLD
ITT
N2
OIL PRESS
OIL TEMP
FF PPH
84.7
46
115
7300
84.7
46
115
7300
APU RPM
APU EGT 250
FUEL QTY LBS
TOTAL 12000
6000 6000
START
START
STAB AIL
LWD RWD
RUD
L R
NU
ND
6.6
SPOILERS
CAB ALT
CAB RATE
7300
1000
MFD CONTROL
O
85.0 MCT 85.0 MCT TRIM
V T
100
COM1 NAV1 ATC1/TCAS ADF1 HF1 COM3 COM2
118.000 108.00 1799.5 118.000 118.000
118.000 108.00 STBY 190.0 2.0000 118.000 118.000
ABV
TX
2.0000 AM
25
ELECTRICAL
35° C 26° C
24.0 V
L BATT
24.5 V
0.0 V R BATT
GEN
HYD
L ESS BUS
L MAIN BUS
R ESS BUS
R MAIN BUS
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