High Difference in Pack Discharge Temperatures (Condensor fault)

TASK 21-61-00-810-905-A
High Difference in Pack Discharge Temperatures (Condensor fault)

1. Possible Causes

CONDENSER [10HM2]
CONDENSER [11HM2]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 12-33-21-618-001	Pre-conditioning through the LP Ground Connection
AMM 21-52-32-000-001	Removal of the Condenser
AMM 21-52-32-400-001	Installation of the Condenser

3. Fault Confirmation
Subtask 21-61-00-710-187-A

A. Test
(1) Do the pre-conditioning with the APU AMM 12-33-21-618-001.
(2) Make sure that the pack 1 inlet-pressure indication on the ECAM BLEED page is > 20 PSI.
(3) Compare the PACK 1 & 2 outlet temperatures on the ECAM BLEED page during the next work step.

NOTE: PACK 1 & 2 outlet temperatures must be almost equal.

(4) On the AIR COND panel 30VU:

put the COCKPIT, the FWD CABIN and the AFT CABIN selectors to the HOT position,
wait for 10 minutes,
put the COCKPIT, the FWD CABIN and the AFT CABIN selectors to the COLD position.

4. Fault Isolation
Subtask 21-61-00-860-094-A

A. Safety Precautions
(1) Before you do any corrective actions you must stop the pre-conditioning with the APU AMM 12-33-21-618-001.

Subtask 21-61-00-810-237-A

B. If the test shows unequal PACK 1 & 2 outlet temperatures:

make a full visual inspection of the Pack 1 & 2 condensors for cracks.

Subtask 21-61-00-810-238-A

C. If the inspection shows cracks:

replace the damaged CONDENSER [10HM2] or CONDENSER [11HM2] AMM 21-52-32-000-001 and AMM 21-52-32-400-001.

5. Close-up
Subtask 21-61-00-860-095-A

A. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:24:58 UTC