DOC AIRBUS | AMM A320FLoad and Cancel the Frequency Analysis [IAE]
TASK 77-32-34-869-049-A
Load and Cancel the Frequency Analysis
1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Referenced Information
3. Job Set-up
Subtask 77-32-34-861-061-A ** ON A/C NOT FOR ALL Subtask 77-32-34-865-063-A ** ON A/C NOT FOR ALL
Subtask 77-32-34-869-084-B ** ON A/C NOT FOR ALL
Subtask 77-32-34-862-061-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 03:18:34 UTC
Load and Cancel the Frequency Analysis
1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| TASK 24-41-00-861-002-A | Energize the Aircraft Electrical Circuits from the External Power |
| TASK 24-41-00-861-002-A-01 | Energize the Aircraft Electrical Circuits from the APU |
| TASK 24-41-00-861-002-A-02 | Energize the Aircraft Electrical Circuits from Engine 1(2) |
| TASK 24-41-00-862-002-A | De-energize the Aircraft Electrical Circuits Supplied from the External Power |
| TASK 24-41-00-862-002-A-01 | De-energize the Aircraft Electrical Circuits Supplied from the APU |
| TASK 24-41-00-862-002-A-02 | De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2) |
| TASK 31-32-00-860-012-A | Procedure to Get Access to the SYSTEM REPORT/TEST/ENG Page |
| TASK 71-50-00-210-010-A | Wire Harness Visual Inspection - All Power Plant Electrical Cables |
| TSM 77-30-00-810-826 | High N1 Vibration Level on Engine 1 |
| TSM 77-30-00-810-827 | High N1 Vibration Level on Engine 2 |
| TSM 77-30-00-810-828 | High N2 Vibration Level on Engine 1 |
| TSM 77-30-00-810-829 | High N2 Vibration Level on Engine 2 |
| TSM 77-30-00-810-833 | Loss of the Vibration Level Indications on Engine 1 |
| TSM 77-30-00-810-834 | Loss of the Vibration Level Indications on Engine 2 |
EVMU MenuSubtask 77-32-34-861-061-A ** ON A/C NOT FOR ALL Subtask 77-32-34-865-063-A ** ON A/C NOT FOR ALL
B. Make sure that this(these) circuit breaker(s) is(are) closed:
Subtask 77-32-34-869-083-A ** ON A/C NOT FOR ALL | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 121VU | ENGINE/ENG1 AND 2/EVMU | 1EV | R44 |
C. Aircraft Maintenance Configuration
(1) On the 1(2) MCDU, get the SYSTEM REPORT/TEST ENG page (Ref. AMM TASK 31-32-00-860-012).
(2) Push the line key adjacent to the ENG VIBRATION indication: the first EVMU page comes into view.
(3) Push the NEXT PAGE function key: the second EVMU MENU page comes into view.
(4) Push the line key adjacent to the FREQUENCY ANALYSIS indication to get the FREQUENCY ANALYSIS program.
(5) The FREQUENCY ANALYSIS menu comes into view.
detail A.
4. Procedure(1) On the 1(2) MCDU, get the SYSTEM REPORT/TEST ENG page (Ref. AMM TASK 31-32-00-860-012).
(2) Push the line key adjacent to the ENG VIBRATION indication: the first EVMU page comes into view.
(3) Push the NEXT PAGE function key: the second EVMU MENU page comes into view.
(4) Push the line key adjacent to the FREQUENCY ANALYSIS indication to get the FREQUENCY ANALYSIS program.
(5) The FREQUENCY ANALYSIS menu comes into view.
detail A.
Subtask 77-32-34-869-084-B ** ON A/C NOT FOR ALL
A. Load the Frequency Analysis
Subtask 77-32-34-869-123-A ** ON A/C NOT FOR ALL | ACTION | RESULT |
|---|---|
| 1.Push the line key adjacent to the LOAD ENG 1(2) N1 (N2) indication. | The EVMU FREQUENCY ANALYSIS ENG 1(2) N1(2) comes into view (XXXX/A). detail B. NOTE: You can do the frequency analysis during cruise (flight phase = 6) or when the aircraft is on the ground, engine(s) running (flight phase = 2, 3 or 9). |
| 2.On the MCDU keyboard, write the new value. | The new value comes into view in the scratch pad under the RETURN indication (YYYY/B). detail A. NOTE: If you do typing errors, use the CLEAR key on the MCDU keyboard. |
| 3.Push the line key adjacent to the old value. | The new value comes into view and replaces the old value (YYYY/B). detail B. NOTE: If the EVMU does not accept the new value:
NOTE: The operator can enter or clear up to three lines of comments with the comments menu. These three lines will show on the printout of the frequency analysis. |
| 4.Push the line key adjacent to the COMMENTS indication. | The EVMU FREQUENCY ANALYSIS COMMENTS menu comes into view. |
| 5.Enter your comment through the MCDU keyboard (up to 24 characters). | The comment shows in the MCDU scratchpad under the RETURN indication. NOTE: You can correct typing errors with the CLEAR key of the keyboard. |
| 6.Push the line key adjacent to the LOAD LINE 1 indication. | The comment shows under LINE 1 in the EVMU FREQUENCY ANALYSIS COMMENTS menu |
| 7.Do again steps 4 to 6 for line 2 and 3 if necessary. | |
| 8.Push the line key adjacent to the RETURN indication. | The EVMU FREQUENCY ANALYSIS menu comes into view. NOTE: When the speed and phase are those shown on the MCDU, the printer will automatically print the Frequency Analysis. The printer gives the vibration in "IPS PEAK", every 4 Hz and in frequency range from 0 to 500Hz. |
B. Interpret the frequency analysis
(1) If the velocity VEL(IPSPK) value is high in the frequency range 4Hz to 40Hz, do the check of the wires and connectors for the vibration harness (Ref. AMM TASK 71-50-00-210-010).
N1F = N1 Speed x 0.01665 Hz
where N1 speed is in rpm.
If the velocity VEL(IPSPK) value is high in the frequency range N1F +/- 4Hz, this is indicating high N1 vibration TSM 77-30-00-810-826, TSM 77-30-00-810-827, TSM 77-30-00-810-833.
(3) Calculate the N2 frequency N2F:
N2F = N2 Speed x 0.01665 Hz
where N2 speed is in rpm.
If the velocity VEL(IPSPK) value is high in the frequency range N2F +/- 4Hz, this is indicating high N2 vibration TSM 77-30-00-810-828, TSM 77-30-00-810-829, TSM 77-30-00-810-834.
(4) If the velocity VEL(IPSPK) value is high in the other frequencies, contact IAE Technical Services via the IAE Representative.
Subtask 77-32-34-869-085-A ** ON A/C NOT FOR ALL (1) If the velocity VEL(IPSPK) value is high in the frequency range 4Hz to 40Hz, do the check of the wires and connectors for the vibration harness (Ref. AMM TASK 71-50-00-210-010).
NOTE: It is possible that the EVMU may interpret signals in this frequency range as N1 vibration or N2 vibration. High vibration levels (>3 aircraft units) can generally be felt by the crew and this provides an additional check on whether the vibration is real.
(2) Calculate the N1 frequency N1F: N1F = N1 Speed x 0.01665 Hz
where N1 speed is in rpm.
If the velocity VEL(IPSPK) value is high in the frequency range N1F +/- 4Hz, this is indicating high N1 vibration TSM 77-30-00-810-826, TSM 77-30-00-810-827, TSM 77-30-00-810-833.
(3) Calculate the N2 frequency N2F:
N2F = N2 Speed x 0.01665 Hz
where N2 speed is in rpm.
If the velocity VEL(IPSPK) value is high in the frequency range N2F +/- 4Hz, this is indicating high N2 vibration TSM 77-30-00-810-828, TSM 77-30-00-810-829, TSM 77-30-00-810-834.
(4) If the velocity VEL(IPSPK) value is high in the other frequencies, contact IAE Technical Services via the IAE Representative.
C. Cancel the EVMU Frequency Analysis Demand
5. Close-upNOTE: Failure to cancel the EVMU frequency analysis demand will result in the automatic printing of another analysis some time in the future whenever the trigger conditions are met. This can cause confusion to the flight crew if this occurs in flight.
| ACTION | RESULT |
|---|---|
| Push the line key adjacent to the CANCEL ENG 1 (ENG 2) indication. detail A. | The EVMU FREQUENCY ANALYSIS ENG 1(2) demand is cancelled. |
| On the MCDU, push the line key adjacent to the RETURN indication until the CFDS menu page comes into view. | |
Subtask 77-32-34-862-061-A ** ON A/C NOT FOR ALL