DOC AIRBUS | TSM A320FLoss of the DLRB signal to the FDIMU (FDIU Part)
TASK 31-38-00-810-821-A
Loss of the DLRB signal to the FDIMU (FDIU Part)
1. Possible Causes
2. Job Set-up Information
A. Referenced Information
3. Fault Confirmation
Subtask 31-38-00-710-069-A ** ON A/C NOT FOR ALL 4. Fault Isolation
Subtask 31-38-00-810-070-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:30:10 UTC
Loss of the DLRB signal to the FDIMU (FDIU Part)
1. Possible Causes
2. Job Set-up Information
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| AMM 31-33-00-710-013 | Flight Data Interface and Management Unit (FDIMU) DFDRS Software Load Procedure |
| ASM 313801 | |
| AMM 31-38-34-000-001 | Removal of the Data Loading Routing Box (DLRB) |
| AMM 31-38-34-400-001 | Installation of the Data Loading Routing Box (DLRB) |
Subtask 31-38-00-710-069-A ** ON A/C NOT FOR ALL 4. Fault Isolation
Subtask 31-38-00-810-070-A ** ON A/C NOT FOR ALL
A. If the fault is identified by the crew observation:
FDR SYS uploading is not possible.
(1) Do a check for of the aircraft wiring between the ROUTING BOX-DATA LOADING [102TD] and DMU/FDIU (FDIMU) [10TV] ASM 313801:
(a) pin AA/12J, 12K (10TV) to the pin B/12, 28 (102TD).
(b) pin AB/12C, 12D (10TV) to the pin A/42, 9 (102TD).
(3) if the fault continues:
Subtask 31-38-00-710-070-A ** ON A/C NOT FOR ALL FDR SYS uploading is not possible.
(1) Do a check for of the aircraft wiring between the ROUTING BOX-DATA LOADING [102TD] and DMU/FDIU (FDIMU) [10TV] ASM 313801:
- A/25 (102TD) to pin AA/14F (10TV).
(a) pin AA/12J, 12K (10TV) to the pin B/12, 28 (102TD).
(b) pin AB/12C, 12D (10TV) to the pin A/42, 9 (102TD).
(3) if the fault continues:
- replace the ROUTING BOX-DATA LOADING [102TD] AMM 31-38-34-000-001 and AMM 31-38-34-400-001.
B. Do the test given in Para. 3.A.