AFT Cabin Temperature uncontrollable or too low with TAV AMBER XX

TASK 21-63-00-810-857-A
AFT Cabin Temperature uncontrollable or too low with TAV AMBER XX

1. Possible Causes

TRIM VALVE AFT CAB [13HK]
wiring

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 21-63-00-710-004	Operational Test of the Cockpit and Cabin Temperature Control with CFDS/MCDU
ASM 216302
ASM 216303
AMM 21-63-51-000-001	Removal of the Trim Air Valve
AMM 21-63-51-400-001	Installation of the Trim Air Valve

3. Fault Confirmation
Subtask 21-63-00-710-143-A ** ON A/C NOT FOR ALL

A. Confirmation of the Fault
(1) Do the operational test of the cockpit and cabin temperature-control system AMM 21-63-00-710-004.

4. Fault Isolation
Subtask 21-63-00-810-151-A ** ON A/C NOT FOR ALL

A. If on the ECAM COND page the AFT trim air valve position indication shows amber XX and/or the Aft cabin temperature is uncontrollable or too low (in flight):

replace the TRIM VALVE AFT CAB [13HK] AMM 21-63-51-000-001 and AMM 21-63-51-400-001.

(1) If the fault continues:
(a) This wiring check is only applicable for Trim Air Valves previous to P/N 1320A0000-01 or 963B0000-01 or 750B0000-01.

do a check and repair the wiring ASM 216303 from:
the TRIM VALVE AFT CABIN (13HK) to the Zone Controller (8HK) and,
the TRIM VALVE AFT CABIN (13HK) to ground.

(b) This wiring check is only applicable for Trim Air Valves P/N 1320A0000-01 or 963B0000-01 or 750B0000-01 and subsequent.

do a check and repair the wiring ASM 216303 between:
TRIM VALVE AFT CABIN (13HK) connector A/U and ZC (8HK) connector AB/15A,
TRIM VALVE AFT CABIN (13HK) connector A/J and ZC (8HK) connector AB/15C,
TRIM VALVE AFT CABIN (13HK) connector A/K and ZC (8HK) connector AB/15D,
TRIM VALVE AFT CABIN (13HK) connector A/L and ZC (8HK) connector AB/15E,
TRIM VALVE AFT CABIN (13HK) connector A/C and ZC (8HK) connector AB/5C,
TRIM VALVE AFT CABIN (13HK) connector A/E and ZC (8HK) connector AB/5B,
the TRIM VALVE AFT CABIN (13HK) to ground.

Subtask 21-63-00-810-151-B ** ON A/C NOT FOR ALL

A. If on the ECAM COND page the AFT trim air valve position indication shows amber XX and/or the Aft cabin temperature is uncontrollable or too low (in flight):

replace the TRIM VALVE AFT CAB [13HK] AMM 21-63-51-000-001 and AMM 21-63-51-400-001.

(1) If the fault continues:

do a check and repair the wiring ASM 216302 from:
the TRIM AIR VALVE AFT CABIN (13HK) to the ACSC2 (57HH) and,
the TRIM AIR VALVE AFT CABIN (13HK) to ground.

Subtask 21-63-00-710-144-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:25:05 UTC