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· Interface with CAIMS.
AUXILIARY POWER UNIT
Rev 3, Apr 25, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
05−10−21
ECU SCHEMATIC
GF0510_016
EXTERNAL SERVICES PANEL
APU SHUT−OFF APU BAY
WOW
INPUTS OUTPUTS
EICAS STATUS
DISPLAYS
DOOR
RPM
EGT
CAIMS
BITE CODES
OPERATING HOURS
429 COMMUNICATION
WARNING
AND
CAUTION
MESSAGES
APU
LOAD
CONTROL
VALVE
ON SPEED
PNEU/ELECTRICAL
LOADING
AVAILABLE
DOOR
OPENED/CLOSED
COMMANDS
APU START
FUEL SOV
INLET DOOR
ECS
FUEL
ENGINE START
−FEED BACK PARAMETERS−
START
ACCELERATION
RUN
SHUTDOWN
COMPARTMENT
SHUT DOWN BUTTON
INPUT
OUTPUT
DISCH
PULL
1 2
ELECTRICAL
ON
BATT MASTER
OFF
EMS
ON ON
AVAIL AVAIL
EXT AC EXT DC
PUSH OFF/RESET
OFF OFF
FAIL FAIL
GEN 3 GEN 4
OFF
FAIL
GEN 2
OFF
FAIL
GEN 1
OFF
FAIL
APU GEN
PUSH
OFF/RESET
OFF
ON
RAT GEN
XBLEED
AUTO
CLSD OPEN
L ENG BLEED
AUTO
OFF ON
R ENG BLEED
AUTO
OFF ON
APU BLEED
AUTO
OFF ON
APU
RUN
OFF START
AUXILIARY POWER UNIT
Flight Crew Operating Manual Rev 3, Apr 25, 2005
CSP 700−5000−6
Volume 2
05−10−22
EICAS MESSAGES
APU OIL LO PRESS
Indicates that a low oil
pressure condition
APU OIL HI TEMP exists.
Indicates that a high oil
temperature condition
exists. APU EGT SENSORS
Indicates both
thermocouples have
failed.
APU OVERTEMP
Indicates that an EGT
over temperature
exists.
APU OVERSPEED
Indicates that an APU
overspeed protective
shut down has
occurred.
APU BLEED SYS FAIL
Indicates that the APU
LCV does not match
command position or
bleed failures are
detected by the bleed
management computer.
APU DOOR FAIL
Indicates that the APU
door position does not
match command
position.
APU REVERSE FLOW
Indicates that a reverse
flow from the engine
bleed(s) to the APU
exists.
APU OVERTEMP
APU OVERSPEED
APU BLEED SYS FAIL
APU OIL LO PRESS
APU OIL HI TEMP
APU EGT SENSORS
APU DOOR FAIL
APU REVERSE FLOW
GF0510_017a
APU FIRE
APU FIRE
Indicates that an APU
fire has occured.
APU FUEL SOV
APU FUEL SOV
Indicates that the APU
fuel shutoff valve has
failed open.
AUXILIARY POWER UNIT
Rev 3, Apr 25, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
05−10−23
EICAS MESSAGES (CONT'D)
GF0510_018b
APU SHUTDOWN
Indicates that an APU
protective shut down
has occurred, other
than an overspeed or
over temperature.
APU OIL LO QTY
Indicates that the APU
oil level has reached
3.5 quarts ( 2 quarts
low).
APU BLEED DISABLED
Indicates:
1 − That the LCV command
The inlet pressure is less
than 3.3 psia (35,000 ft).
The 60 second warmup
period after speed reaches
99% is not complete
(ground only).
APU IN BITE
Indicates that RUN is
selected and the
prestart BITE is in
progress.
APU BLEED ON
Indicates that the APU
BLEED switch is in the
ON position and the
load control valve is
open.
APU FAULT
Indicates a failure in
one of the following:
Single speed
sensor.
EGT thermocouple.
Fuel solenoid (failed
to close).
Fuel/oil filters in
impending bypass.
Low oil pressure
switch has failed
(in flight).
APU FADEC FAIL
Indicates that no data
is received by the DAU.
APU NOT AVAILABLE
Indicates that when
START or RUN is
selected,
checks/testing is in
progress.
APU BLEED OFF
Indicates that the APU
BLEED switch is in the
OFF position and the
load control valve is
closed.
APU FADEC FAIL
APU OIL LO QTY
APU NOT AVAILABLE
APU BLEED DISABLED
APU SHUTDOWN
APU FAULT
APU IN BITE
APU BLEED ON
APU BLEED OFF
APU SOVS CLSD
APU FUEL SOV CLSD
APU SOVS CLSD
Indicates that both fuel
and bleed air shutoff
valves are closed.
　
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