DOC AIRBUS | AMM A320FVIBRATION SENSORS - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
1. General
The function of the turbine center frame accelerometer is to supply a high frequency rotor vibration signal to EEC channel A.
The turbine center frame accelerometer is installed on the turbine center frame and goes through the core.
The function of the No. 1 bearing accelerometer is to supply a high frequency rotor vibration signal to EEC channel B.
The No. 1 bearing accelerometer is installed on the No. 1 bearing support at 8 o'clock aft looking forward and goes through fan hub strut 2.
Both turbine center frame and No. 1 bearing accelerometer signals are filtered in the EEC synchronously to the N1 and N2 speeds to obtain respectively a Low Pressure (LP) rotor vibration signal and a High Pressure (HP) rotor vibration signal.
** ON A/C NOT FOR ALL The function of the turbine center frame accelerometer is to supply a high frequency rotor vibration signal to EEC channel A.
The turbine center frame accelerometer is installed on the turbine center frame and goes through the core.
The function of the No. 1 bearing accelerometer is to supply a high frequency rotor vibration signal to EEC channel B.
The No. 1 bearing accelerometer is installed on the No. 1 bearing support at 8 o'clock aft looking forward and goes through fan hub strut 2.
Both turbine center frame and No. 1 bearing accelerometer signals are filtered in the EEC synchronously to the N1 and N2 speeds to obtain respectively a Low Pressure (LP) rotor vibration signal and a High Pressure (HP) rotor vibration signal.
2. System Description
A. Turbine center frame accelerometer
The turbine center frame accelerometer consists of:
The sensor is a single axis piezo-electric sensor. It converts vibration accelerations, only in its sensitive axis (engine radial), into a proportional electrical signal.
The signal is sent to EEC channel A, providing an indication of the HP rotor vibration condition. If needed, this signal is a back-up of the No. 1 bearing accelerometer.
The turbine center frame accelerometer consists of:
- A sensing element
- A housing to mount the sensor with three bolts
- A lead cable (MI cable)
- A flange equipped with a connector.
The sensor is a single axis piezo-electric sensor. It converts vibration accelerations, only in its sensitive axis (engine radial), into a proportional electrical signal.
The signal is sent to EEC channel A, providing an indication of the HP rotor vibration condition. If needed, this signal is a back-up of the No. 1 bearing accelerometer.
B. No. 1 bearing accelerometer
The No. 1 bearing accelerometer consists of:
The sensor is a single axis piezo-electric sensor. It converts vibration accelerations, only in its sensitive axis (engine radial), into a proportional electrical signal.
The signal is sent to EEC channel B, providing an indication of the LP rotor vibration condition. If needed, this signal is a back-up of the turbine center frame accelerometer.
The No. 1 bearing accelerometer consists of:
- A sensing element
- A housing to mount the sensor with three bolts
- A lead cable (MI cable)
- A bush
- A rigid tube
- A connector.
The sensor is a single axis piezo-electric sensor. It converts vibration accelerations, only in its sensitive axis (engine radial), into a proportional electrical signal.
The signal is sent to EEC channel B, providing an indication of the LP rotor vibration condition. If needed, this signal is a back-up of the turbine center frame accelerometer.