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The cable is protected by the installation of shock absorbers which damp out any parasite vibration.
The #1 bearing vibration sensor permanently monitors the engine vibration and due to its position, is more sensitive to fan and booster vibration. However, this sensor also reads N2 and LPT vibrations.
The data is used to perform fan trim balance. This sensor is not a Line Replaceable Unit (LRU). In case of failure, the TRF sensor must be selected, through the CFDS in maintenance mode, in order to continue engine vibration monitoring.

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SENSORS Page 39
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03

CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
ENGINE SENSORS
TRF vibration sensor.
The TRF vibration sensor is secured at the 12 o’clock position on the turbine rear frame.
It is a 50 pC/g piezo-electric sensor.
A semi-rigid cable is routed from the vibration sensor to an electrical connector, which is secured on a bracket on the core engine at the 10 o’clock position.
The TRF vibration sensor monitors the vertical acceleration of the rotors and sends the analogue signals to the EVMU for vibration analysis processing.

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ENGINE SYSTEMS Jan 03

CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
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EFG
ENGINE WIRING HARNESSES

EFFECTIVITY
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ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03

CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
ENGINE WIRING HARNESSES
Two types of harnesses are used, depending on where they are installed on the engine.
Fan section.
Harnesses that run on the fan inlet case and the fan frame, have a conventional design.
Cold section harnesses are designated :
-HJ7, HJ8, HJ9, HJ10, HJ11, HJ12, HJ13, DPM.
DPM is the harness routed from the Master Chip Detector (MCD) to the visual contamination indicator.
Core engine section.
Harnesses routed along the core engine section have a special design that can withstand high temperatures.
Hot section harnesses are designated :
-HCJ11L, HCJ11R, HCJ12L, HCJ12R, HCJ13.

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EFFECTIVITY
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ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03

CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
ENGINE WIRING HARNESSES
The electrical harnesses ensure the connections between the various electrical, electronic and electro-mechanical components, mounted on the engine.
All the harnesses converge to the 6 o’clock junction box, which provides an interface between the two types.
　
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