Loss of the Vibration Level Indications on Engine 1 and Engine 2

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1. Possible Causes
· EVMU ( 2EV )
· wiring from the circuit breaker 1EV to the pin AC/2 of the EVMU (2EV)
· C/B-ENGINE/ENG1 AND 2/EVMU ( 1EV )
2 Job Set-up Information
A. Referenced Information
REFERENCE DESIGNATION
Ref. AMM 24-41-00-861-002 Energize the Aircraft Electrical Circuits from the External Power
Ref. AMM 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied from the External
Power
Ref. AMM 31-60-00-860-001 EIS Start Procedure
Ref. AMM 31-60-00-860-002 EIS Stop Procedure
Ref. ASM 77-32-02
Ref. AMM 77-32-34-000-041 Removal of the Engine Vibration Monitoring Unit (EVMU)
Ref. AMM 77-32-34-400-041 Installation of the Engine Vibration Monitoring Unit (EVMU)
3. Fault Confirmation
Subtask 77-30-00-860-051-A
A. Job Set-Up
(1) Energize the aircraft electrical circuits
Ref. AMM 24-41-00-861-002 .
(2) Do the EIS start procedure (Upper ECAM DU and lower ECAM DU only)
Ref. AMM 31-60-00-860-001 .
Subtask 77-30-00-710-088-A
B. Test
(1) On the ECAM control panel:
· push the ENG key to get the ENGINE page on the lower ECAM display unit.
(2) On the ENGINE page, the N1 and N2 vibration level indications of the two engines show amber
crosses.
4. Fault Isolation
Subtask 77-30-00-865-056-A
A. Table of the circuit breakers used in this procedure:
PANEL DESIGNATION FIN LOCATION
121VU ENGINE/ENG1 AND 2/EVMU 1EV R44
Subtask 77-30-00-810-070-A
B. If the test confirms the fault:
· 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 pin AC/2 of the EVMU Ref. ASM 77-32-02.
(a) If there is 115VAC:
· replace the EVMU ( 2EV ) , Ref. AMM 77-32-34-000-041 and Ref. AMM 77-32-34-400-041 .
(b) If there is no 115VAC:
· do a check and repair the wiring from the circuit breaker 1EV to the pin AC/2 of the EVMU
(2EV) , Ref. ASM 77-32-02.
1 If the fault continues:
· replace the C/B-ENGINE/ENG1 AND 2/EVMU ( 1EV ) .
Subtask 77-30-00-710-089-A
C. Do the test given in Para. 3.A. to make sure that the N1 and N2 vibration level indications of the two
engines are present (no amber crosses).
5. Close-up
Subtask 77-30-00-860-052-A
A. Aircraft Maintenance Configuration
(1) On the ECAM control panel, set the UPPER DISPLAY and LOWER DISPLAY potentiometers to OFF.
Ref. AMM 31-60-00-860-002
(2) De-energize the aircraft electrical circuits
Ref. AMM 24-41-00-862-002
Put the aircraft back to its initial configuration. [Rev.6 from Feb 2017] 2026.04.04 04:37:52 UTC