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START CONTROL SCHEMATIC
GF0510_015
APU STARTER
MOTOR
APU IGNITION
EXCITER
95% RPM
DE−ENERGIZED
60% RPM
DE−ENERGIZED
5% RPM
ENERGIZED
APU EGT AND RPM
INDICATIONS ON
EICAS STATUS
PAGE
DATA ACQUISTION
UNIT (DAU) #3
28 VOLT FADEC
DC
0% RPM
ENERGIZED
APU
RUN
OFF START
The FADEC control outputs include fuel metering, arming and regulation of the LCV and control of
the surge valve. It also performs protective shut downs when the APU is not within allowable
operating limits.
A builtintest
capability of the FADEC tests components for serviceability and initiates the start
sequence. It also enables reliable fault isolation within the system.
AUXILIARY POWER UNIT
REV 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
Volume 2
05−10−19
START CONTROL SCHEMATIC (CONT'D)
FADEC Inputs and Outputs
The following are input signals received by the FADEC:
· 28 VDC power, supplied by the APU Battery Direct Bus (the Avionics Battery Direct Bus is
used as a backup).
· ECS, fuel and engine start.
· Inlet door position.
· Feedback of all applicable parameters during start, acceleration, run and shut down.
· Fuel, bleed/air conditioning, antiicing,
engine start and electrical control panels.
· APU FIRE DISCH handle, APU SHUTOFF
(external services panel and APU bay) and
WOW status.
The following are outputs generated by the FADEC:
· APU start and fuel feed shutoff.
· Door open and close operations.
· On speed loading of pneumatics/electrics.
· ARINC 429 Communication signals to EICAS.
· Interface with CAIMS.
AUXILIARY POWER UNIT
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
05−10−20
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
REV 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
Volume 2
05−10−21
EICAS MESSAGES
APU OIL LO PRESS
Indicates that a low oil
pressure condition
exists.
APU OIL HI TEMP
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_017
AUXILIARY POWER UNIT
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
05−10−22
EICAS MESSAGES (CONT'D)
GF0510_018
APU SHUTDOWN
Indicates that an APU
protective shut down
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