Failure of the TRF Vibration Sensor on Engine 1

TASK 77-30-00-810-811-A
Failure of the TRF Vibration Sensor on Engine 1

1. Possible Causes

wiring from the EVMU (2EV) to the TRF vibration sensor (4003EV)
SENSOR-TRF VIB [4003EV]
EVMU [2EV]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 77-31-30-000-001	Removal of the Turbine Rear Frame Vibration Sensor
AMM 77-31-30-000-002	Removal of the Turbine Rear Frame Vibration Sensor
AMM 77-31-30-400-001	Installation of the Turbine Rear Frame Vibration Sensor
AMM 77-31-30-400-002	Installation of the Turbine Rear Frame Vibration Sensor
ASM 773202
AMM 77-32-34-000-040	Removal of the Monitoring Unit Engine Vibration (EVMU)
AMM 77-32-34-000-042	Removal of the Engine Vibration Monitoring Unit (EVMU)
AMM 77-32-34-400-040	Installation of the Vibration Monitoring Unit (EVMU)
AMM 77-32-34-400-042	Installation of the Engine Vibration Monitoring Unit (EVMU)
AMM 77-32-34-710-040	Operational Check of EVMU through CFDS for Advisory Indication on ECAM
AMM 77-32-34-860-041	Change the configuration of the Accelerometer
AMM 77-32-34-869-041	Change the configuration of the Accelerometer

3. Fault Confirmation
Subtask 77-30-00-710-067-A ** ON A/C NOT FOR ALL

A. Test
Do the operational test of the Engine Vibration Monitoring Unit (EVMU) through the Centralized Fault Display System (CFDS) AMM 77-32-34-710-040.

4. Fault Isolation
Subtask 77-30-00-810-059-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message ENG1 SECOND ACCEL:

do a check of the wiring from the EVMU (2EV) to the TRF vibration sensor (4003EV) pins AA/1C, 2D to pins AA/2, 3 ASM 773202.

(1) If there is no continuity:

repair the above wiring.

(2) If there is continuity:

Replace the SENSOR-TRF VIB [4003EV] , AMM 77-31-30-000-001 and AMM 77-31-30-400-001.
If No. 1 bearing vibration sensor operates correctly, configure the accelerometer to get data from No. 1 bearing vibration sensor AMM 77-32-34-869-041.

(3) If the fault continues:

replace the EVMU [2EV] , AMM 77-32-34-000-040 and AMM 77-32-34-400-040.

Subtask 77-30-00-810-059-B ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message ENG1 SECOND ACCEL:

do a check of the wiring from the EVMU (2EV) to the TRF vibration sensor (4003EV) pins AA/1C, 2D to pins AA/2, 3 ASM 773202.

(1) If there is no continuity:

repair the above wiring.

(2) If there is continuity:

Replace the SENSOR-TRF VIB [4003EV] , AMM 77-31-30-000-002 and AMM 77-31-30-400-002.
If No. 1 bearing vibration sensor operates correctly, configure the accelerometer to get data from No. 1 bearing vibration sensor AMM 77-32-34-860-041.

(3) If the fault continues:

replace the EVMU [2EV] , AMM 77-32-34-000-042 and AMM 77-32-34-400-042.

Subtask 77-30-00-710-068-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.A.

[Rev.8 from Aug 2018] 2026.04.04 04:37:47 UTC