FAULT MESSAGE : "ECU (ARINC OUT)"
* CH A SHOWN ONLY CH B IDENTICAL
CTC-231-033-00 ARINC WRAPAROUND TEST
EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION FAULT DETECTION
FAULT DETECTION
& ANNUNCIATION Page 33
Nov 02
CONTROL LOOPS
LPTC, HPTC, TBV & FMV control.
The LPTC, HPTC, TBV and FMV have dual sensors providing feedback of the actuator position.
CFM56-5B TRAINING MANUAL
Demand and position signals disagree.
The ECU checks if the sensed (measured) actuator position agrees with the demanded position.
Only the active channel provides an excitation voltage to drive its torque motor, because the other channel’s output drivers are disconnected when in standby mode.
Both channels, active and standby, provide excitation signals for the primary windings of the position sensors.
The secondary windings provide position feedback signals to their respective channels and are subjected to a validation check to make sure they are within range.
The signals input to each channel is also compared across the CCDL to make sure that there is not a position disagree.
A fault message is generated if :
- the absolute value of the difference between the
demand and valid position is greater than 5%. - there is not a wrap fault on the local channel.
- N2 is greater than 22%.
- the channel is active.
Typical fault messages. LPTC VLV, J11, ECU
HPTC VLV, J12, ECU
J7, HMU (FMVRES), ECU
EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION FAULT DETECTION
FAULT DETECTION
& ANNUNCIATION Page 34
Nov 02
CFM56-5B TRAINING MANUAL
SECONDARY COILS FEEDBACK (LVDT1)
CTC-231-034-00 LPTC, HPTC, TBV AND FMV CONTROL
EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION FAULT DETECTION
FAULT DETECTION
& ANNUNCIATION Page 35
Nov 02
CFM56-5B TRAINING MANUAL
CONTROL LOOPS VSV control.
The VSV system has two actuators, one on either side of the engine. Each actuator contains an LVDT to provide position feedback signals.
One LVDT is connected to ECU channel A and the other LVDT is connected to channel B.
Both channels, active and standby, provide excitation signals for their respective primary windings and the signals induced into the secondary windings provide position feedback signals.
The feedback signals are subjected to validation checks and the inputs to each channel are also compared across the CCDL, to make sure that there is not a position disagree. A fault message is generated if :
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