DOC AIRBUS | TSM A320FFailure of the Skin Temperature Sensor
TASK 21-26-00-810-819-A
Failure of the Skin Temperature Sensor
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 21-26-00-865-063-A
Subtask 21-26-00-810-057-A
[Rev.8 from Aug 2018]
2026.04.04 04:24:38 UTC
Failure of the Skin Temperature Sensor
1. Possible Causes
- SENSOR-SKIN TEMP, AVNCS VENT [28HQ]
wiring between the AEVC (10HQ) and the skin temperature sensor (28HQ) - AEVC [10HQ]
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| AMM 21-26-00-710-001 | Operational Check of the Avionics Equipment Ventilation-System via MCDU |
| AMM 21-26-00-710-008 | Operational Test to Read the CFDS for CLASS 3 Faults of the AEVC |
| AMM 21-26-00-710-009 | Operational Test to Read the CFDS for LAST LEG REPORT of the AEVC |
| ASM 212602 | |
| AMM 21-26-13-000-001 | Removal of the Avionics Ventilation Skin Temperature Sensor |
| AMM 21-26-13-400-001 | Installation of the Avionics Ventilation Skin Temperature Sensor |
| AMM 21-26-34-000-001 | Removal of the Avionics Equipment Ventilation Computer (AEVC) |
| AMM 21-26-34-400-001 | Installation of the Avionics Equipment Ventilation Computer (AEVC) |
Subtask 21-26-00-865-063-A
A. Table of the circuit breakers used in this procedure:
Subtask 21-26-00-710-064-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 122VU | AIR COND/AVNCS/VENT/MONG | 3HQ | Y17 |
B. Test
(1) Do a reset of the AEVC (10HQ).
(a) Open the circuit breaker AIR COND/AVNCS/VENT/MONG (3HQ).
(b) Wait for five seconds.
(c) Close the circuit breaker AIR COND/AVNCS/VENT/MONG (3HQ).
(2) Do the operational test of the avionics equipment ventilation from the Multipurpose Control and Display Unit (MCDU) AMM 21-26-00-710-001.
(3) Read the LAST LEG REPORT of the AEVC AMM 21-26-00-710-009.
(4) Read the CLASS 3 faults of the AEVC AMM 21-26-00-710-008.
4. Fault Isolation(1) Do a reset of the AEVC (10HQ).
(a) Open the circuit breaker AIR COND/AVNCS/VENT/MONG (3HQ).
(b) Wait for five seconds.
(c) Close the circuit breaker AIR COND/AVNCS/VENT/MONG (3HQ).
(2) Do the operational test of the avionics equipment ventilation from the Multipurpose Control and Display Unit (MCDU) AMM 21-26-00-710-001.
(3) Read the LAST LEG REPORT of the AEVC AMM 21-26-00-710-009.
(4) Read the CLASS 3 faults of the AEVC AMM 21-26-00-710-008.
Subtask 21-26-00-810-057-A
A. If the test gives the maintenance message SKIN TEMP SENSOR 28HQ:
Subtask 21-26-00-710-065-A - Replace the SENSOR-SKIN TEMP, AVNCS VENT [28HQ] AMM 21-26-13-000-001 and AMM 21-26-13-400-001.
- Do a check of the
wiring between the AEVC (10HQ) and the skin temperature sensor (28HQ) ASM 212602:
. Pin AB/1D and pin A/A
. Pin AB/2D and pin A/B
. Pin AB/3D and pin A/C.
- Repair the related wiring.
- Replace the AEVC [10HQ] AMM 21-26-34-000-001 and AMM 21-26-34-400-001.
B. Do the operational test given in Para. 3.