DOC AIRBUS | TSM A320FLoss of the Heading Data on the VOR/ADF/DME RMI
TASK 34-57-00-810-815-A
Loss of the Heading Data on the VOR/ADF/DME RMI
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 34-57-00-740-066-A ** ON A/C NOT FOR ALL 4. Fault Isolation
Subtask 34-57-00-810-067-B ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:33:33 UTC
Loss of the Heading Data on the VOR/ADF/DME RMI
1. Possible Causes
- SEL SW-ATT HDG [13FP]
RELAY-HDG SOURCE SEL (19FN) wiring of the HDG SOURCE SEL relay (19FN) - RMI-VOR/ADF/DME [21FN]
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| AMM 34-14-00-740-001 | Interface Test of the IR |
| ASM 345701 | |
| AMM 34-57-22-000-002 | Removal of the VOR/ADF/DME RMI |
| AMM 34-57-22-400-002 | Installation of the VOR/ADF/DME RMI |
Subtask 34-57-00-740-066-A ** ON A/C NOT FOR ALL 4. Fault Isolation
Subtask 34-57-00-810-067-B ** ON A/C NOT FOR ALL
A. If during the test, with the ATT HDG selector switch at CAPT 3, the HDG data do not come into view on the VOR/ADF/DME RMI (21FN):
Subtask 34-57-00-740-067-A ** ON A/C NOT FOR ALL - do a check for a maintenance message in the BITE test of the IR system.
- Do the trouble shooting procedure related to the maintenance message.
- replace the SEL SW-ATT HDG [13FP]
- replace the
RELAY-HDG SOURCE SEL (19FN) .
- do a check of the
wiring of the HDG SOURCE SEL relay (19FN) :
. pins A/A and A/Z to the ground points
. pin A/X to the ATT HDG selector switch (13FP): pin A/1
. pin A/2 to VOR/ADF/DME RMI (21FN): pin A/16.
ASM 345701.
- repair the above wiring.
- replace the RMI-VOR/ADF/DME [21FN] AMM 34-57-22-000-002 and AMM 34-57-22-400-002.
B. Do the test given in Para. 3.