W DOC AIRBUS | TSM A320F

Loss of N1 and N2 Vibration Indications on the Two Engines

TASK 77-30-00-810-803-A
Loss of N1 and N2 Vibration Indications on the Two Engines

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
AMM 31-60-00-860-001
EIS Start Procedure
AMM 31-60-00-860-002
EIS Stop Procedure
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 77-30-00-860-050-A ** ON A/C NOT FOR ALL
A. Job Set-Up
   (1) Do the EIS start procedure (Upper ECAM DU and lower ECAM DU only)
AMM 31-60-00-860-001.
Subtask 77-30-00-710-053-A ** ON A/C NOT FOR ALL
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 on the two engines show amber XX.
4. Fault Isolation
Subtask 77-30-00-865-054-A ** ON A/C NOT FOR ALL
A. Table of the circuit breakers used in this procedure:
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
121VUENGINE/ENG1 AND 2/EVMU1EVR44
Subtask 77-30-00-810-052-A ** ON A/C NOT FOR ALL
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 ASM 773202.
     (a) If there is 115VAC:
     (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) ASM 773202.
       1 If the fault continues:
  • replace the C/B-ENGINE/ENG1 AND 2/EVMU [1EV]
Subtask 77-30-00-810-052-B ** ON A/C NOT FOR ALL
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 ASM 773202.
     (a) If there is 115VAC:
     (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) ASM 773202.
       1 If the fault continues:
  • replace the C/B-ENGINE/ENG1 AND 2/EVMU [1EV]
Subtask 77-30-00-710-054-A ** ON A/C NOT FOR ALL
C. Do the operational test of the Engine Vibration Monitoring Unit (EVMU) through the Centralized Fault Display System (CFDS) AMM 77-32-34-710-040.
5. Close-up
Subtask 77-30-00-860-053-A ** ON A/C NOT FOR ALL
A. On the ECAM control panel, set the UPPER display and LOWER display potentiometers to OFF AMM 31-60-00-860-002.
Put the aircraft back to its initial configuration.
[Rev.8 from Aug 2018] 2026.04.04 04:37:47 UTC
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