DOC AIRBUS | TSM A320FLoss of the Terrain Display on CAPT ND and F/O ND
TASK 34-48-00-810-852-A
Loss of the Terrain Display on CAPT ND and F/O ND
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 34-48-00-865-058-A
Subtask 34-48-00-810-117-A
[Rev.8 from Aug 2018]
2026.04.04 04:33:18 UTC
Loss of the Terrain Display on CAPT ND and F/O ND
1. Possible Causes
wiring of the 28VDC signal from the circuit breaker (2WZ) to the relays - C/B-EIS/GPWS/28VDC [2WZ]
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| ESPM 2046100 | |
| AMM 34-48-00-710-001 | Operational Test of GPWS Ground Self-test Function |
| ASM 344802 |
Subtask 34-48-00-865-058-A
A. Table of the circuit breakers used in this procedure:
Subtask 34-48-00-710-080-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 121VU | EIS/GPWS/28VDC | 2WZ | P06 |
B. Test
(1) Do the Operational Test of the Enhanced GPWS Ground Self-Test Function AMM 34-48-00-710-001
4. Fault Isolation(1) Do the Operational Test of the Enhanced GPWS Ground Self-Test Function AMM 34-48-00-710-001
Subtask 34-48-00-810-117-A
A. If there is no terrain display on CAPT ND and F/O ND:
Subtask 34-48-00-710-081-A - Make sure that the circuit breaker 2WZ is closed
- do a check for 28VDC at pin X of the relays 32WZ, 33WZ and/or 34WZ, 35WZ
- do a check of the
wiring of the 28VDC signal from the circuit breaker (2WZ) to the relays 32WZ, 33WZ and/or 34WZ, 35WZ ASM 344802.
- repair the above wiring.
- replace the C/B-EIS/GPWS/28VDC [2WZ] ESPM 2046100.
B. Do the test given in Para. 3.