E.
Alternate Values for Failed Sensors (Ref. Table 1)
(1) The ECB 59KD programs alternate values for certain failed LRUs. These are identified in the PUT or during the APU IOT. The LRU failures and the alternate actions are listed in Table 1.
R EFF : 001-049, 101-105, 107-107, 151-199, 49-61-00Page 30 201-210, Config-2 Aug 01/05
CES
(2) Table 1 Alternate Values List for Failed Sensors
-------------------------------------------------------------------------------Failed Action -------------------------------------------------------------------------------
1. P2 Sensor 1. P2 sensor failed:
A. On ground and:
-N < 7% then P2 = PT
-PT failed the PT = 13.66 psia (0.94 bar)
B. In filght:
-
and N < 7% then P2 = PT
-
and N >= 7% then P2 = last PT at 7%
-
and N > 95% then P2 = 7 psia (0.48 bar)
-Bleed disabled
C. If P2 failed during Take Off, bleed is
disabled with 5 minutes delay. -------------------------------------------------------------------------------
2. DELTA P Sensor A. Program IGVs closed at 22 degrees (2.5 v)
B. Program SCV open (O ma) -------------------------------------------------------------------------------
3. PT Sensor A. Program IGVs closed at 22 degrees (2.5 v)
B. Program SCV open (O ma) -------------------------------------------------------------------------------
4.
LCIT Sensor A. Program T2 based on P2 ------------------------------------------------------------------------------
5.
LVDT Sensor Program IGVs closed at 22 degrees (2.5 v) ------------------------------------------------------------------------------
6.
APU Sump Oil Sensor Program oil temperature = T2 ------------------------------------------------------------------------------
7.
Fuel Temperature Sensor A. Oil Temperature Sensor -------------------------------------------------------------------------------
R EFF : 001-049, 101-105, 107-107, 151-199, 49-61-00Page 31 201-210, Config-2 Aug 01/05
CES CONTROL AND MONITORING - DESCRIPTION AND OPERATION
__________________________________________________
1. General
_______ A Full Authority Digital Electronic Control system is contained in the ECB 59KD. The ECB 59KD provides control for the operation and monitoring of the Auxiliary Power Unit (APU). It also provides the communication to the aircrafts other systems. The ECB gives:
-
the control for the automatic operation of the APU,
-
the control for the APU at a constant speed,
-
the protection of the APU if a failure or an overload occurs,
-
the supply of pneumatic and shaft power,
-
the monitoring of the Line Replaceable Units (LRUs),
-
the 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
3. System Description
__________________
A. ECB
(1) The ECB is installed adjacent to the BULK cargo compartment on the right side, between FR58 and FR59. It is held in an ARINC 600-6 mounting rack. The ECB provides full authority digital APU control from the start initialization, during the acceleration, at the governor speed to the shutdown. The ECB monitors the APU speed, the APU temperatures, the load compressor air flow, and other critical parameters based on signal inputs from the accessory sensors and the control switches. These data are used for the calculation and to continuously control:
-
the fuel flow,
-
the IGV position,
-
the bleed control valve position.
The ECB also controls the subsequent systems:
-
the starter motor,
-
the igniters,
-
the fuel control shutoff valve,
-
the air intake flap.
The ECB communicates with the aircraft systems through the ARINC 429
busses.
The subsequent LRUs are controlled by separate torque motor currents:
-
the fuel control assembly,
-
the IGV actuator,
-
the bleed control valve.
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