W DOC AIRBUS | TSM A320F

AFT Cabin Duct Overheat Detection

TASK 21-63-00-810-825-A
AFT Cabin Duct Overheat Detection

1. Possible Causes
  • TEMP SENSOR AFT CAB DUCT [17HK]
  • wiring
  • TRIM VALVE AFT CAB [13HK]
  • TRIM AIR PRESS VALVE [14HK]
  • CONT-AIR COND SYSTEM 1 [47HH]
  • ZONE CONTROLLER [8HK]
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 21-61-34-000-002
Removal of the Air-Conditioning System Controller
AMM 21-61-34-400-002
Installation of the Air-Conditioning System Controller
AMM 21-63-00-710-004
Operational Test of the Cockpit and Cabin Temperature Control with CFDS/MCDU
ASM 216302
ASM 216303
AMM 21-63-15-000-001
Removal of the Duct Temperature Sensors
AMM 21-63-15-400-001
Installation of the Duct Temperature Sensors
AMM 21-63-34-000-001
Removal of the Zone Controller
AMM 21-63-34-400-001
Installation of the Zone Controller
AMM 21-63-51-000-001
Removal of the Trim Air Valve
AMM 21-63-51-400-001
Installation of the Trim Air Valve
AMM 21-63-52-000-001
Removal of the Pressure Regulating Valve
AMM 21-63-52-400-001
Installation of the Pressure Regulating Valve
3. Fault Confirmation
Subtask 21-63-00-710-099-A ** ON A/C NOT FOR ALL
A. Do the operational test of the cockpit and cabin temperature-control system with CFDS/MCDU AMM 21-63-00-710-004.
NOTE: If a fault is detected, the ZC gives a fault code for shop maintenance in addition to the related CFDS message(s). For detailed information see the applicable Page Block 301.
Subtask 21-63-00-710-099-B ** ON A/C NOT FOR ALL
A. Do the operational test of the cockpit and cabin temperature-control system with CFDS/MCDU AMM 21-63-00-710-004.
4. Fault Isolation
Subtask 21-63-00-810-093-B ** ON A/C NOT FOR ALL
A. If the test confirms the fault:
  • do a check that the resistance of the AFT cabin-duct temperature sensor (17HK) measured between connector A/E and A/F and connector A/C and A/D is in these limits ASM 216303:
Temp (Deg.C)
OHMS
+ 10
18820 +/- 5 %
+ 18
13340 +/- 5 %
+ 25
10000 +/- 5 %
+ 30
8197 +/- 5 %
+ 40
5598 +/- 5 %
+ 50
3903 +/- 5 %
   (1) If the resistance values are out of the specified limits:
   (2) If the resistance values are in the specified limits:
  • do a check and repair the wiring ASM 216302 from:
  • the SENSOR-DUCT TEMPERATURE,AFT CABIN (17HK) to the ACSC2 (57HH) and,
  • the SENSOR-DUCT TEMPERATURE,AFT CABIN (17HK) to ground.
   (3) If the fault continues:
   (4) If the fault continues:
  • do a check and repair the wiring ASM 216302 from:
  • the VALVE-TRIM AIR,AFT CABIN (13HK) to the ACSC2 (57HH) and,
  • the VALVE-TRIM AIR,AFT CABIN (13HK) to ground.
   (5) If the fault continues:
   (6) If the fault continues:
  • do a check and repair the wiring ASM 216303 from:
  • the VALVE-PRESSURE REGULATING (14HK) to the ACSC1 (47HH) and,
  • the VALVE-PRESSURE REGULATING(14HK) to ground.
   (7) If the fault continues:
Subtask 21-63-00-810-093-C ** ON A/C NOT FOR ALL
A. If the test confirms the fault:
  • do a check that the resistance of the AFT cabin-duct temperature sensor (17HK) measured between connector A/E and A/F and connector A/C and A/D is in these limits ASM 216303:
Temp (Deg.C)
OHMS
+ 10
18820 +/- 5 %
+ 18
13340 +/- 5 %
+ 25
10000 +/- 5 %
+ 30
8197 +/- 5 %
+ 40
5598 +/- 5 %
+ 50
3903 +/- 5 %
   (1) If the resistance values are out of the specified limits:
   (2) If the resistance values are in the specified limits:
  • do a check and repair the wiring ASM 216303 from:
  • the SENSOR-DUCT TEMPERATURE,AFT CABIN (17HK) to the ZC (8HK) and,
  • the SENSOR-DUCT TEMPERATURE,AFT CABIN (17HK) to ground.
   (3) If the fault continues:
   (4) If the fault continues:
  • do a check and repair the wiring ASM 216303 from:
  • the VALVE-TRIM AIR,AFT CABIN (13HK) to the ZC (8HK) and,
  • the VALVE-TRIM AIR,AFT CABIN (13HK) to ground.
   (5) If the fault continues:
   (6) If the fault continues:
  • do a check and repair the wiring ASM 216303 from:
  • the VALVE-PRESSURE REGULATING (14HK) to the ZC (8HK) and,
  • the VALVE-PRESSURE REGULATING(14HK) to ground.
   (7) If the fault continues:
Subtask 21-63-00-810-107-B
B. If the test gives the maintenance message TEST OK, but on the ECAM upper DU the warning COND AFT CAB DUCT OVHT comes on:
  • do a check of the AFT cabin-duct inlet temperature on the ECAM COND page.
   (1) If the temperature is below 70 Deg.C:
Subtask 21-63-00-710-100-A
C. Do the test as given in the Para. 3.A.
5. Close-up
Subtask 21-63-00-860-074-A
A. Put the aircraft back to its initial configuration.
[Rev.8 from Aug 2018] 2026.04.04 04:25:03 UTC
"AVIABRAIN" 2025