CTC-231-084-00 SPECIFIC DATA
EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION CFDS MESSAGE
INTERROGATION
FAULT DETECTION
& ANNUNCIATION Page 39
Nov 02
CFM56-5B TRAINING MANUAL
CENTRALIZED FAULT DISPLAY SYSTEM (CFDS). ENGINE SYSTEMS - ECU.
Function terminated report.
If the cockpit rotary selector is turned to ‘IGN/START’, at any time, menu mode will terminate the current function and display the function terminated report screen.
If the master lever is set to ‘ON’, (except during the ignition test, or FADEC test), menu mode will also terminate the current function and display the function terminated report screen.
The purpose is to prompt the operator to return cockpit switches to safe positions. The page is displayed until the operator does so and then, when the return key is pressed, the screen displays the main menu.
EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION CFDS MESSAGE
INTERROGATION
FAULT DETECTION
& ANNUNCIATION Page 40
Nov 02
CFM56-5B TRAINING MANUAL
CTC-231-085-00 FUNCTION TERMINATED REPORT
EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION CFDS MESSAGE
INTERROGATION
FAULT DETECTION
& ANNUNCIATION Page 41 Nov 02
CFM56-5B TRAINING MANUAL
CENTRALIZED FAULT DISPLAY SYSTEM (CFDS). ENGINE SYSTEMS - EVMU.
Engine vibration measurement consists of :
- 2 transducers (piezo-electric accelerometers). - an Engine Vibration Monitoring Unit (EVMU). - 2 vibration indications.
The No1 bearing vibration sensor permanently monitors vibrations from the No1 bearing. It also senses vibrations in the LPT and HPT shafts. This sensor is also used for trim balance operations.
The Turbine Rear Frame (TRF) vibration sensor is used in conjunction with the No1 bearing vibration sensor to monitor and, if necessary, reduce engine vibration levels using the trim balance procedure.
The EVMU computes the position and the amplitude of the unbalance and is capable of on-board fan trim balancing.
The EVMU does not interface directly with the ECU.
The EVMU receives analog signals from the 4 engine accelerometers (2 per engine) and the N1 and N2 speed sensors of each engine.
The EVMU interfaces with the CFDS, through ARINC429 databuses, for maintenance fault messages and vibration data analysis.
The EVMU also sends signals to SDAC1, SDAC2 and the DMU over ARINC429 databuses.
The ECAM receives information via SDAC1 and SDAC 2. The vibration indications are displayed in green on the lower ECAM display, in the engine and cruise pages.
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