-Protection of the APU if a failure or an overload occurs,
 -Monitoring of the Line Replaceable Units (LRUs),
 -Tests on the APU system.
 2. Component Location
__________________
 (Ref. Fig. 001)

 -------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF.
 -------------------------------------------------------------------------------4KD RELAY - APU MAIN 107VU 126 824AR 6KD RELAY - APU AVAIL 103VU 126 824AR
 14KD MASTER SW, P/BSW 25VU 210 59KD BOX - ELECTRONIC CONTROL (ECB) 152 827 49-61-34 R
 3. System Description
__________________
 A. Electronic Control Box 59KD The ECB is a full-authority microprocessor-based control-unit. This means that when an APU is started all further control of the APU is fully automatic and provided by the ECB. The subsystems listed below work with the ECB to operate all necessary APU sequence, protective and control logics:
 -Speed Control System,
 -Fuel Control System,
 -Pneumatic System,
 -Lubrication System,
 -Cooling System,
 -Electrical System,
 -
APU Diagnostic and Data Retention System,

 -
APU Protective System.

R  EFF : 001-049, 101-105, 107-107, 151-199, 49-61-00Page 1 201-210, Config-2 Aug 01/05
 CES

 Control and Monitoring - Component Location
 Figure 001

 CES  The ECB provides control from the start initialization, during the acceleration and the governed speed through to the shutdown. The ECB monitors the APU speed, the APU temperatures, the load-compressor air flow, and other critical parameters. All parameters are based on signal inputs from the accessory sensors and the control switches. These data are used to calculate and to continuously control the:

 -Fuel flow,
 -IGV position,
 -Load control valve,
 -Surge control valve position. The ECB has an integral BITE (Build-In Test Equipment) which continuously monitors and stores shutdown-fault information along with failures of certain LRUs. The ECB communicates with the aircraft systems through the ARINC 429 busses. The ECB together with the Data Memory Module (DMM) retains the APU data. At the beginning of the APU start, the ECB makes a copy of the recent APU life data, stored in the DMM. This data will be updated, during the APU operation and transferred back to the DMM when the APU is shutdown.
 4.
 Power Supply

____________ (Ref. Fig. 002) The battery bus 301PP supplies 28VDC to the ECB 59KD through the circuit breaker ECB SPLY 1KD and the relay APU MAIN 4KD. The 28VDC supply for the APU MAIN relay is through the circuit breaker APU CTL 2KD. The ECB continuously monitors its internal voltages and starts an APU shutdown if a voltage failure occurs. This prevents unsafe operation of the APU

 5.
 Interface

_________
 A. ECB Input Signals
 (1) Discrete Inputs
 ------------------------------------------------------------------------SIGNAL NAME ACTIVE INACTIVE INPUT SOURCE ------------------------------------------------------------------------Start Switch 28VDC OPEN A/C Stop Switch GND OPEN A/C Flap Open Switch >5VDC GND A/C Flap Close Switch GND 28VDC A/C Flap Movement 28VDC OPEN A/C MES Switch 28VDC OPEN A/C Bleed Air Demand (LCV activation) GND OPEN A/C Emergency Switch GND OPEN A/C Start Contactor Monitor (Volt) >5VDC GND/OPEN A/C AC Identifier 1 GND OPEN A/C AC Identifier 2 GND OPEN A/C

R  EFF : 001-049, 101-105, 107-107, 151-199, 49-61-00Page 3 201-210, Config-2 Aug 01/05
 CES

 Control and Monitoring - Electrical Supply
 Figure 002

 CES

 ------------------------------------------------------------------------
SIGNAL NAME ACTIVE INACTIVE INPUT SOURCE ------------------------------------------------------------------------
Oil Heater BITE enable  GND  OPEN  A/C
 Fuel LP valve BITE enable  GND  OPEN  A/C
 Air Start Valve Command  28VDC  OPEN  A/C
 In-Air Switch  OPEN  GND  A/C
 Starter Voltage Monitor  OPEN  GND  A/C
 Low Oil Pressure  GND  OPEN  APU
 Low Fuel Pressure  GND  OPEN  APU
 Low Oil Level  GND  OPEN  APU
 Load Valve OPEN Signal  GND  OPEN  APU
 Load Valve CLOSED Signal  GND  OPEN  APU
 Oil Filter Clogged  GND  OPEN  APU
 (2) Analog Inputs

 ------------------------------------------------------------------------SIGNAL NAME DEFINITION INPUT SOURCE ------------------------------------------------------------------------
　
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