DOC AIRBUS | TSM A320FNAI Pushbutton-Switch-Command Discrete-Signal Failure on Channel B
TASK 30-21-00-810-832-A
NAI Pushbutton-Switch-Command Discrete-Signal Failure on Channel B
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 30-21-00-730-072-A ** ON A/C NOT FOR ALL
Subtask 30-21-00-810-084-A ** ON A/C NOT FOR ALL
Subtask 30-21-00-942-076-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:29:33 UTC
NAI Pushbutton-Switch-Command Discrete-Signal Failure on Channel B
1. Possible Causes
[4000KS]
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| TSM TASK 30-21-00-810-831-A | NAI Pushbutton-Switch-Command Discrete-Signal Failure on Channel A |
| TSM TASK 71-00-00-810-835-A | Component and Harness Intermittent Troubleshooting Procedure for Guidance Troubleshooting Intermittent Faults |
| AMM 24-41-00-861-002 | Energize the Aircraft Electrical Circuits from the External Power |
| AMM 31-32-00-860-012 | Procedure to Get Access to the SYSTEM REPORT/TEST/ENG Page |
| AMM 31-60-00-860-001 | EIS Start Procedure |
| AMM 73-21-01-000-801 | Removal of the Electronic Engine Control (EEC) |
| AMM 73-21-01-400-801 | Installation of the Electronic Engine Control (EEC) |
Subtask 30-21-00-730-072-A ** ON A/C NOT FOR ALL
A. Test
(1) Energize the aircraft electrical circuits
AMM 24-41-00-861-002.
(2) Do the EIS start procedure (Upper ECAM DU and lower ECAM DU only) AMM 31-60-00-860-001.
(3) In the cockpit, on the overhead control and indicator panel, on the ANTI ICE section push the ENG1(2) pushbutton switch (the ON legend comes on).
(4) Wait three seconds.
(5) On the overhead control and indicator panel, on the ANTI ICE section release the ENG1(2) pushbutton switch (the ON legend goes off).
(6) On the MCDU screen, get access to the SYSTEM REPORT/TEST/ENG menu page AMM 31-32-00-860-012.
(a) On the SYSTEM REPORT/TEST/ENG menu page, push the line key adjacent to the FADEC 1(2) B indication.
The EEC 1(2) CHAN B page comes into view.
(b) Push the line key adjacent to the GND SCANNING indication, the GROUND SCANNING menu page comes into view.
1 If there is a maintenance message, go to the Para. Fault Isolation.
2 If the maintenance message does not come into view again, do the component and harness intermittent for guidance troubleshooting intermittent faults (Ref. TSM TASK 71-00-00-810-835).
a If you find no fault, send the engine back to service. Monitor the engine to make sure that the maintenance message does not come into view again.
4. Fault Isolation(1) Energize the aircraft electrical circuits
AMM 24-41-00-861-002.
(2) Do the EIS start procedure (Upper ECAM DU and lower ECAM DU only) AMM 31-60-00-860-001.
(3) In the cockpit, on the overhead control and indicator panel, on the ANTI ICE section push the ENG1(2) pushbutton switch (the ON legend comes on).
(4) Wait three seconds.
(5) On the overhead control and indicator panel, on the ANTI ICE section release the ENG1(2) pushbutton switch (the ON legend goes off).
(6) On the MCDU screen, get access to the SYSTEM REPORT/TEST/ENG menu page AMM 31-32-00-860-012.
(a) On the SYSTEM REPORT/TEST/ENG menu page, push the line key adjacent to the FADEC 1(2) B indication.
The EEC 1(2) CHAN B page comes into view.
(b) Push the line key adjacent to the GND SCANNING indication, the GROUND SCANNING menu page comes into view.
1 If there is a maintenance message, go to the Para. Fault Isolation.
2 If the maintenance message does not come into view again, do the component and harness intermittent for guidance troubleshooting intermittent faults (Ref. TSM TASK 71-00-00-810-835).
a If you find no fault, send the engine back to service. Monitor the engine to make sure that the maintenance message does not come into view again.
Subtask 30-21-00-810-084-A ** ON A/C NOT FOR ALL
A. Test
(1) If the maintenance message comes into view on channel A, do the troubleshooting procedure on channel A (Ref. TSM TASK 30-21-00-810-831).
(a) If the maintenance message does not come into view on channel A:
1 Replace the
2 Do the test given in Para. 3.
5. Close-up(1) If the maintenance message comes into view on channel A, do the troubleshooting procedure on channel A (Ref. TSM TASK 30-21-00-810-831).
(a) If the maintenance message does not come into view on channel A:
1 Replace the
2 Do the test given in Para. 3.
Subtask 30-21-00-942-076-A ** ON A/C NOT FOR ALL
A. Put the aircraft back to its initial configuration.
(1) Make sure that the work area is clean and clear of tools and other items.
(1) Make sure that the work area is clean and clear of tools and other items.