DOC AIRBUS | TSM A320FAFT LDCC Isolation Valves have not closed during AFT LDCC Smoke Warning Test or have not opened after Reset of the Valves
TASK 26-16-00-810-823-A
AFT LDCC Isolation Valves have not closed during AFT LDCC Smoke Warning Test or have not opened after Reset of the Valves
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 26-16-00-865-069-A ** ON A/C NOT FOR ALL
Subtask 26-16-00-810-113-A ** ON A/C NOT FOR ALL
Subtask 26-16-00-860-072-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:27:19 UTC
AFT LDCC Isolation Valves have not closed during AFT LDCC Smoke Warning Test or have not opened after Reset of the Valves
1. Possible Causes
- ISOL VALVE AFT CARGO OUTLET [33HN]
- ISOL VALVE AFT CARGO INLET [34HN]
- DIR-CIDS, 1 [101RH]
- DIR-CIDS, 2 [102RH]
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| TSM TASK 21-28-00-810-802-A | AFT Cargo-Compartment Isolation Valve(s) Fault |
| AMM 23-73-34-000-001 | Removal of the CIDS Director |
| AMM 23-73-34-400-001 | Installation of the CIDS Director |
| AMM 26-10-00-740-802 | Ground Scanning of the Cabin Intercommunication Data-System (CIDS) - Smoke Detection Function (SDF) |
Subtask 26-16-00-865-069-A ** ON A/C NOT FOR ALL
A. Table of the circuit breakers used in this procedure:
Subtask 26-16-00-710-095-A ** ON A/C NOT FOR ALL | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 49VU | AIR COND/CIDS/SDF/DIR2 ESS | 18WH | C06 |
| 49VU | AIR COND/CIDS/SDF/DIR1 ESS | 15WH | C05 |
| 122VU | AIR COND/CIDS/SDF/DIR NORM/2 | 14WH | T18 |
| 122VU | AIR COND/CIDS/SDF/DIR NORM/1 | 17WH | T17 |
B. Test
(1) Open the circuit breakers 14WH, 15WH, 17WH and 18WH, wait for approximately 10 seconds and close them again, wait for a minimum of 30 seconds before you start the test.
(2) After a minimum time of 30 seconds, do the Ground Scanning of the Cabin Intercommunication Data-System (CIDS) - Smoke Detection Function (SDF) AMM 26-10-00-740-802.
4. Fault Isolation(1) Open the circuit breakers 14WH, 15WH, 17WH and 18WH, wait for approximately 10 seconds and close them again, wait for a minimum of 30 seconds before you start the test.
(2) After a minimum time of 30 seconds, do the Ground Scanning of the Cabin Intercommunication Data-System (CIDS) - Smoke Detection Function (SDF) AMM 26-10-00-740-802.
Subtask 26-16-00-810-113-A ** ON A/C NOT FOR ALL
A. If the test gives a different maintenance message:
Subtask 26-16-00-810-114-A ** ON A/C NOT FOR ALL - Do the trouble shooting procedure related to the maintenance message.
B. If the test gives the maintenance message TEST OK, no other maintenance action is necessary.
Subtask 26-16-00-810-115-A ** ON A/C NOT FOR ALL C. If the test gives the maintenance message
AFT CARGO ISOL VALVES/ CVC (10HN)/ CIDS DIR (101RH) or
AFT CARGO ISOL VALVES/ CVC (10HN)/ CIDS DIR (102RH):
(1) Do the trouble shooting procedure (Ref. TSM TASK 21-28-00-810-802) for the ISOL VALVE AFT CARGO OUTLET [33HN] and ISOL VALVE AFT CARGO INLET [34HN] .
(2) If the fault continues:
Subtask 26-16-00-710-096-A ** ON A/C NOT FOR ALL AFT CARGO ISOL VALVES/ CVC (10HN)/ CIDS DIR (101RH) or
AFT CARGO ISOL VALVES/ CVC (10HN)/ CIDS DIR (102RH):
(1) Do the trouble shooting procedure (Ref. TSM TASK 21-28-00-810-802) for the ISOL VALVE AFT CARGO OUTLET [33HN] and ISOL VALVE AFT CARGO INLET [34HN] .
(2) If the fault continues:
- Replace the related DIR-CIDS, 1 [101RH] or DIR-CIDS, 2 [102RH] AMM 23-73-34-000-001 and AMM 23-73-34-400-001.
D. Do the test given in Para. 3.
5. Close-upSubtask 26-16-00-860-072-A ** ON A/C NOT FOR ALL
A. Put the aircraft back to its initial configuration.