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A built-in-test capability of the FADEC tests components for serviceability and initiates the start sequence. It also enables reliable fault isolation within the system.
Volume 2 Flight Crew Operating Manual Rev 3, Apr 25, 2005
START CONTROL SCHEMATIC (CONT'D)
FADEC Inputs and Outputs
The following are input signals received by the FADEC:
.
28 VDC power, supplied by the DC 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, anti-icing, 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.
Rev 3, Apr 25, 2005 Flight Crew Operating Manual Volume 2
AUXILIARY POWER UNIT
ECU SCHEMATIC
INPUTS OUTPUTS
Volume 2 Flight Crew Operating Manual Rev 3, Apr 25, 2005
EICAS MESSAGES
APU FIRE Indicates that an APU APU OVERTEMP fire has occured. Indicates that an EGT
APU BLEED SYS FAIL
Indicates that the APU LCV does not match
APU OVERSPEED
command position or Indicates that an APUbleed failures are overspeed protectivedetected by the bleed shut down hasmanagement computer.
occurred.
APU FUEL SOV
Indicates that the APU fuel shutoff valve has
APU OIL LO PRESS
failed open.
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
APU DOOR FAIL
thermocouples have
Indicates that the APU failed.
door position does not
match command
position.
flow from the engine
bleed(s) to the APU
exists.
GF0510_017a
Rev 3, Apr 25, 2005 Flight Crew Operating Manual Volume 2
AUXILIARY POWER UNIT
EICAS MESSAGES (CONT'D)
APU OIL LO QTY APU FADEC FAIL
Indicates that the APU Indicates that no data
oil level has reached is received by the DAU.
3.5 quarts ( 2 quarts
APU NOT AVAILABLE
low).
Indicates that when START or RUN is selected, checks/testing is in
APU BLEED DISABLED
progress.
Indicates: 1 . That the LCV command cannot enable bleed:
The inlet pressure is less
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