--------------------------------------------------------------------
LOAD OUTPUT SIGNAL SIGNAL STEADY CONDITION
 STATE --------------------------------------------------------------------Air Intake Actuator 28 V DC 1.6 A (Ref. 49-16-51 (open CMD) Air Intake Actuator 28 V DC 1.6 A (Ref. 49-16-51 (close CMD) APU System Bus ARINC 429 APU Fuel Low Pressure Relay 28 V DC 200 mA
 (3)
 ECB 59KD Output Signals to APU loads:

 -fuel solenoid,
 -fuel-control Torque Motor (TM),
 -ignition unit driver,
 -surge control valve (TM),
 -inlet guide vanes (TM),
 -de-oil solenoid,
 -load-control valve solenoid,

 (4)
 APU Input Signals to the ECB 59KD:

 -EGT (T5) chromel-alumel thermocouples (redundant),
 -monopole transducer (APU speed) (redundant),
 - oil-sump temperature sensor,

 -high-oil temperature switch,
 -low-oil pressure switch,
 -
load-compressor inlet temperature - chromel alumel thermocouple,

 -
load-compressor discharge temperature - chromel/alumel
 thermocouple,

 -ambient pressure transducer (P2),
 -
load-compressor delta pressure transducer (DELTA P),

 -
load-compressor discharge total pressure-transducer (PT),

 -inlet-guide vane actuator-position (LVDT),
 -starter voltage,
 -APU serial number encoder,
 -
load control valve (open position) indication,

 -
load control valve (close position) indication,

 -low oil level switch,
 -clogged oil filter switch(es).

R **ON A/C 063-099, 401-499,
 A. Aircraft (A/C) Input Signals to the ECB 59KD
 ------------------------------------------------------------------------
INPUT SIGNAL SIGNAL
 ------------------------------------------------------------------------
Master Switch/Stop  Ground/Open
 Start  28 V DC
 Environmental Control System (ECS)  ARINC 429 BUS
 air demand
 Main Engine Start (MES)  28 V DC
 Emergency Shutdown  Ground
 Bleed-air Valve Operation  Ground
 Air/ground Signal  Ground for ground
 condition
 A/C Parameter and Centralized Fault  ARINC 429 BUS
 Display System (CFDS)
 Start Contactor Monitor Signal  Open/28 V/ground
 TSO/JAR Configuration  Open/Ground
 for TSO Configuration
 Air Intake Actuator  28 V DC
 Start Valve Command  28 V DC
 APU Oil Heater BITE enable  GND for BITE enable
 Fuel Low Press. Valve BITE enable  GND for BITE enable
 Air Intake closed switch  ground
 Air Intake open switch  open
 A/C Identification A319,A320/A321  ground for A321
 (1) A/C Sensors connected to the ECB 59KD:
 - low-fuel pressure switch 5030 QM
 - generator oil-temperature sensor,
 - air-intake position switches. 

 (2) ECB 59KD Output Signals to the A/C
 --------------------------------------------------------------------LOAD OUTPUT SIGNAL SIGNAL STEADY CONDITION
 STATE --------------------------------------------------------------------APU AVAILABLE 28 V DC 400 mA Start Contactor 28 V DC 1 A Back-Up Start Contactor 28 V DC 1 A APU Fault 28 V DC 200 mA Start in Progress 28 V DC 400 mA Load Control Valve 28 V DC 400 mA (Ref. 49-51-51 (open position) APU Main Relay Ground 400 mA Air Intake Actuator 28 V DC 1.6 A (Ref. 49-16-51 (open CMD) Air Intake Actuator 28 V DC 1.6 A (Ref. 49-16-51 (close CMD) APU System Bus ARINC 429 APU Fuel Low Pressure Relay 28 V DC 200 mA
 (3)
 ECB 59KD Output Signals to APU loads:

 -fuel solenoid,
 -fuel-control Torque Motor (TM),
 -ignition unit driver,
 -surge control valve (TM),
 -inlet guide vanes (TM),
 -de-oil solenoid,
 -load-control valve solenoid,

 (4)
 APU Input Signals to the ECB 59KD:

 -EGT (T5) chromel-alumel thermocouples (redundant),
 -monopole transducer (APU speed) (redundant),
 - oil-sump temperature sensor,

 -high-oil temperature switch,
 -low-oil pressure switch,
 -
load-compressor inlet temperature - chromel alumel thermocouple,
　
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