EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION ARCHITECTURE
FAULT DETECTION
& ANNUNCIATION Page 3
Nov 02
CFM56-5B TRAINING MANUAL
ECU INPUTS AND OUTPUTS. Electrical interfaces.
The following chart is a summary of the ECU electrical interfaces to show which connectors interface with channel A and which interface with channel B.
EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION ARCHITECTURE
FAULT DETECTION
& ANNUNCIATION Page 4
Nov 02
CFM56-5B TRAINING MANUAL
CHANNEL A
CONNECTOR
(ODD) CHANNEL B CONNECTOR (EVEN) FUNCTION
J1 J2 A/C POWER (28V) AND IGNITER POWER (115V)
J3 J4 A/C INPUT/OUTPUT AND TLA
J5 J6 THRUST REVERSER
J7 J8 SOLENOIDS, TORQUE MOTORS, RESOLVERS, N2
J9 J10 ALTERNATOR, SAV, N1 AND T12
J11 J12 LVDT'S, RVDT'S, T25, BSV POSITION SWITCH
SHARED J14 ENGINE IDENTIFICATION PLUG
J13 SHARED WF METER, THERMOCOUPLES
J15 SHARED TEST INTERFACE
CTC-231-002-00 ELECTRICAL CONNECTORS
EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION ARCHITECTURE
FAULT DETECTION
& ANNUNCIATION Page 5
Nov 02
CFM56-5B TRAINING MANUAL
ENGINE TESTS ECU initialization.
If the engine is not running, the ECU becomes fully operational within a maximum of three seconds after application of airplane power, or an external reset.
If the core speed is greater than 10% N2, the ECU performs a short initialization and is fully functional in less than 750ms after application of airplane power.
Each ECU channel performs a reset initialization sequence in response to aircraft-generated resets, or at power-up.
An aircraft-commanded reset occurs when the master lever is toggled from ON to OFF.
During reset initialization, all RAM variables are initialized, except for a special reserved area. This area of RAM is not initialized as it is allocated to parameters critical to engine operation and which must maintain their values prior to the reset operation.
Built-In-Tests.
Built-In-Test-Equipment (BITE) monitors the system and memorizes failures.
The BITE detects and isolates failures, or combinations of failures, in order to determine the health status of the channels and to transmit maintenance data to the aircraft.
There are two types of Built-In-Test : Initialization test and Periodic test.
The Initialization tests cover functions which cannot be continually tested without disturbing the ECU system operation. The typical tasks of an Initialization test
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