Ground Scanning of the Central Warning System A320
WARNING: MAKE SURE THAT ALL THE CIRCUITS IN MAINTENANCE ARE ISOLATED BEFORE YOU SUPPLY ELECTRICAL POWER TO THE AIRCRAFT. UNWANTED ELECTRICAL POWER CAN BE DANGEROUS.
1. Reason for the Job
Make sure that the FWC 1 and 2, the SDAC 1 and 2 and the ECP operate correctly.
2. Job Set-up Information
A. Work Zones and Access Panels
| ZONE/ACCESS | ZONE DESCRIPTION |
| 210 | CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD |
B. Referenced Information
| REFERENCE | DESIGNATION |
| Ref. 24-41-00-861-002-A | Energize the Aircraft Electrical Circuits from the External Power |
| Ref. 24-41-00-861-002-A01 | Energize the Aircraft Electrical Circuits from the APU |
| Ref. 24-41-00-861-002-A02 | Energize the Aircraft Electrical Circuits from Engine 1(2) |
| Ref. 24-41-00-862-002-A | De-energize the Aircraft Electrical Circuits Supplied from the External Power |
| Ref. 24-41-00-862-002-A01 | De-energize the Aircraft Electrical Circuits Supplied from the APU |
| Ref. 24-41-00-862-002-A02 | De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2) |
| Ref. 31-32-00-860-008-A | Procedure to Get Access to the SYSTEM REPORT/TEST/INST Page |
| Ref. 31-60-00-860-001-A | EIS Start Procedure |
| Ref. 34-10-00-860-002-A | ADIRS Start Procedure |
| Ref. 34-10-00-860-005-A | ADIRS Stop Procedure |
3. Job Set-up
SUBTASK 31-50-00-860-050-A
A. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits Ref. AMM TASK 24-41-00-861-002.
(2) Do the EIS start procedure (upper ECAM DU and lower ECAM DU only) Ref. AMM TASK 31-60-00-860-001
(3) On the maintenance panel 50VU, release the ENG/FADEC GND PWR 1 & 2 pushbutton switches. The legend ON is displayed.
(4) Do the ADIRS start procedure. Ref. AMM TASK 34-10-00-860-002
(5) On one MCDU, get the SYSTEM REPORT/TEST INST menu page item. Ref. AMM TASK 31-32-00-860-008
SUBTASK 31-50-00-865-053-A
B. Make sure that this(these) circuit breaker(s) is(are) closed:
| PANEL | DESIGNATION | FIN | LOCATION |
| 49VU | SDAC/1/SPLY | 3WV | F04 |
| 49VU | SDAC/2/26VAC SYNC/AC ESS BUS | 6WV | F03 |
| 49VU | SDAC/1/26VAC SYNC/AC ESS BUS | 5WV | F02 |
| 49VU | FWS/FWC1/SPLY | 3WW | F01 |
| 121VU | EIS/FWC2/SPLY | 2WW | Q07 |
| 121VU | EIS/SDAC/2/SPLY | 2WV | Q06 |
| 121VU | EIS/SDAC/1/BUS2/26VAC SYNC AC | 7WV | Q03 |
| 121VU | EIS/SDAC/2/BUS2/26VAC SYNC AC | 8WV | Q02 |
4. Procedure
SUBTASK 31-50-00-710-051-B
A. Test
| ACTION | RESULT |
| 1.On one MCDU, on the INST menu page: | |
| -push the line key adjacent to the ECAM 1 indication. | -the menu of the ECAM 1 page comes into view after a few seconds. |
| -set the GROUND SCANNING function. | -make sure that no failure is present by observing:Either a NO FAILURE message is displayedor no message is displayed followed by the ATA ref. 31-XX-XX(where X is a digit to be disregarded) |
| 2.On the MCDU, push the line select key adjacent to the RETURN indication until the CFDS menu page comes into view. |
5. Close-up
SUBTASK 31-50-00-860-051-A
A. Put the aircraft back to its initial configuration.
(1) On the ECAM control panel, set the LOWER DISPLAY and UPPER DISPLAY potentiometers to OFF.
On the maintenance panel 50VU, push the ENG/FADEC GND PWR 1 & 2 pushbutton switches, the legend ON comes OFF.
(2) Do the ADIRS Stop Procedure Ref. AMM TASK 34-10-00-860-005.
(3) De-energize the aircraft electrical circuits Ref. AMM TASK 24-41-00-862-002
(4) Make sure that the work area is clean and clear of tools and other items.
