DOC AIRBUS | AMM A320FANALYZERS - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
1. General
The purpose of the analyzers subsystem is to provide the Electronic Engine Control (EEC) with the Low Pressure (LP) (N1) and High Pressure (HP) (N2) rotors vibration signatures.
It includes:
** ON A/C NOT FOR ALL The purpose of the analyzers subsystem is to provide the Electronic Engine Control (EEC) with the Low Pressure (LP) (N1) and High Pressure (HP) (N2) rotors vibration signatures.
AnalyzersIt includes:
- No. 1 bearing accelerometer: which provides the LP rotor vibration signature.
- Turbine center frame accelerometer: which provides the HP rotor vibration signature. EEC uses signals from the vibration sensors in conjunction with N1 and N2 speed sensors signals (Ref. AMM D/O 77-11-00-00) to calculate and isolate the engine vibration levels and to supply vibration data to the aircraft.
2. Component Description
A. Turbine Center Frame Accelerometer (ATA 77-31-05)
The turbine center frame accelerometer function is to provide an HP rotor vibration signal to the EEC channel A. The turbine center frame accelerometer is installed on the turbine center frame and goes through the core.
The turbine center frame accelerometer function is to provide an HP rotor vibration signal to the EEC channel A. The turbine center frame accelerometer is installed on the turbine center frame and goes through the core.
B. No. 1 Bearing Accelerometer (ATA 77-31-10)
The No. 1 bearing accelerometer function is to provide an LP rotor vibration signal to the 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 the fan hub strut 2.
The No. 1 bearing accelerometer function is to provide an LP rotor vibration signal to the 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 the fan hub strut 2.
3. Indicating
The engine vibration indications are displayed (in green) on the lower Display Unit (DU) of the ECAM, in the engine and cruise pages. The ECAM DU receives the information through the ARINC 429 data bus from the EEC.
The advisory level is equal to the limit that follows:
Limit = 6U for N1 and 4.3U for N2.
If the advisory level is reached, the indication is displayed in amber and the ENG 1(2) HIGH VIBRATION ECAM warning is displayed on the upper DU. If the indication is not available, the corresponding indication is replaced by two amber crosses.
The engine vibration indications are displayed (in green) on the lower Display Unit (DU) of the ECAM, in the engine and cruise pages. The ECAM DU receives the information through the ARINC 429 data bus from the EEC.
The advisory level is equal to the limit that follows:
Limit = 6U for N1 and 4.3U for N2.
If the advisory level is reached, the indication is displayed in amber and the ENG 1(2) HIGH VIBRATION ECAM warning is displayed on the upper DU. If the indication is not available, the corresponding indication is replaced by two amber crosses.