Loss of the Vibration Indications on the two Engines

TASK 77-30-00-810-801-A
Loss of the Vibration Indications on the two Engines

1. Possible Causes

EVMU [2EV]
aircraft wiring
C/B-ENGINE/ENG1 AND 2/EVMU [1EV]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
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

3. Fault Confirmation
Subtask 77-30-00-710-050-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 77-30-00-865-053-A ** ON A/C NOT FOR ALL

A. Table of the circuit breakers used in this procedure:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	ENGINE/ENG1 AND 2/EVMU	1EV	R44

Subtask 77-30-00-810-050-A ** ON A/C NOT FOR ALL

B. If the test gives the maintenance message EVMU:

do a check of the circuit breaker 1EV status.

(1) If the circuit breaker is open:

close the circuit breaker 1EV.

(2) If the circuit breaker is closed:

do a check for 115VAC on the EVMU ASM 773202.

(a) If there is 115VAC:

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

(b) If there is no 115VAC:

do a check and repair the aircraft wiring between the breaker 1EV to the EVMU (2EV) ASM 773202.

1 If the fault continues:

replace the C/B-ENGINE/ENG1 AND 2/EVMU [1EV]

Subtask 77-30-00-810-050-B ** ON A/C NOT FOR ALL

B. If the test gives the maintenance message EVMU:

do a check of the circuit breaker 1EV status.

(1) If the circuit breaker is open:

close the circuit breaker 1EV.

(2) If the circuit breaker is closed:

do a check for 115VAC on the EVMU ASM 773202.

(a) If there is 115VAC:

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

(b) If there is no 115VAC:

do a check and repair the aircraft wiring between the breaker 1EV to the EVMU (2EV) ASM 773202.

1 If the fault continues:

replace the C/B-ENGINE/ENG1 AND 2/EVMU [1EV]

Subtask 77-30-00-710-051-A ** ON A/C NOT FOR ALL

C. Do the check given in Para. 3.A.

[Rev.8 from Aug 2018] 2026.04.04 04:37:46 UTC