High Difference in Pack Discharge Temperatures

TASK 21-61-00-810-865-A
High Difference in Pack Discharge Temperatures

1. Possible Causes

SENSOR-WATER EXTRACTOR TEMPERATURE [11HH]
SENSOR-WATER EXTRACTOR TEMPERATURE [31HH]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 12-33-21-618-001	Pre-conditioning through the LP Ground Connection
AMM 21-61-13-000-001	Removal of the Water-Extractor Temperature Sensors
AMM 21-61-13-400-001	Installation of the Water-Extractor Temperature Sensors

3. Fault Confirmation
Subtask 21-61-00-710-146-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) 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) Do a read out of the CLASS 3 FAULTS of the pack temperature-control system.

4. Fault Isolation
Subtask 21-61-00-860-086-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 21-61-00-810-177-A

B. If the read out of the CLASS 3 FAULTS gives the message P1 WATER EX TEMP SENSOR:

replace the SENSOR-WATER EXTRACTOR TEMPERATURE [11HH] AMM 21-61-13-000-001 and AMM 21-61-13-400-001.

Subtask 21-61-00-810-178-A

C. If the read out of the CLASS 3 FAULTS gives the message P2 WATER EX TEMP SENSOR:

replace the SENSOR-WATER EXTRACTOR TEMPERATURE [31HH] AMM 21-61-13-000-001 and AMM 21-61-13-400-001.

5. Close-up
Subtask 21-61-00-860-085-A

A. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:24:56 UTC