W DOC AIRBUS | TSM A320F

Pack 2 High Discharge Temperature

TASK 21-61-00-810-833-A
Pack 2 High Discharge Temperature

1. Possible Causes
  • P2 PACK DISCH PRESS SENSOR [20HH]
  • ram-air inlet door mechanism
  • MACHINE-AIR CYCLE [11HM1]
  • water injector nozzle
  • HEAT EXCHANGER-MAIN [11HM7]
  • HEAT EXCHANGER-PRIMARY [11HM6]
  • SENSOR-WATER EXTRACTOR TEMPERATURE [31HH]
  • P2 CONTROLLER [27HH]
  • SENSOR-PACK OUTLET PNEUMATIC [11HM10]
  • VALVE-ANTI ICE [37HH]
  • wiring
  • VALVE-TURBINE BYPASS [30HH]
  • REHEATER [11HM3]
  • CONDENSER [11HM2]
  • P2 FLOW CTL VALVE [8HB]
  • water drain line
  • CONT-AIR COND SYSTEM 2 [57HH]
  • FLOW CTL UNIT - PACK 2 [24HB]
  • P2 PRESS INL SENSOR [36HH]
  • SENSOR-PRESS, PACK 2 INLET [24HB1]
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 12-33-21-618-001
Pre-conditioning through the LP Ground Connection
AMM 21-51-13-000-001
Removal of the Pack-Inlet Pressure Sensor
AMM 21-51-13-400-001
Installation of the Pack-Inlet Pressure Sensor
AMM 21-51-51-000-001
Removal of the Pack Flow-Control Valve/ Pack Flow-Control Unit
AMM 21-51-51-400-001
Installation of the Pack Flow-Control Valve/ Pack Flow-Control Unit
AMM 21-52-00-100-001
Cleaning of the Air Conditioning Pack-Primary Heat Exchanger and the Main Heat Exchanger
AMM 21-52-00-100-002
Remove Reheater for Cleaning
AMM 21-52-00-100-003
Cleaning of the Air Conditioning Pack-Condenser
AMM 21-52-00-780-001
Pressure Drop Test of the Reheater
AMM 21-52-00-960-001
Replacement of the Water Injector Nozzle
AMM 21-52-16-000-001
Removal of the Water Extractor
AMM 21-52-16-400-001
Installation of the Water Extractor
AMM 21-52-21-000-001
Removal of the Air Cycle Machine
AMM 21-52-21-400-001
Installation of the Air Cycle Machine
AMM 21-52-42-000-001
Removal of the Water Injector
AMM 21-52-42-400-001
Installation of the Water Injector
ASM 216101
ASM 216102
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
AMM 21-61-14-000-001
Removal of the Pack Discharge Pressure Sensor
AMM 21-61-14-400-001
Installation of the Pack Discharge Pressure Sensor
AMM 21-61-16-000-001
Removal of the Pack-Inlet Pressure Sensor
AMM 21-61-16-400-002
Installation of the Pack-Inlet Pressure Sensor
AMM 21-61-19-000-001
Removal of the Pack-Outlet Pneumatic Sensor
AMM 21-61-19-400-002
Installation of the Pack-Outlet Pneumatic Sensor
AMM 21-61-34-000-001
Removal of the Pack Controller
AMM 21-61-34-000-002
Removal of the Air-Conditioning System Controller
AMM 21-61-34-400-001
Installation of the Pack Controller
AMM 21-61-34-400-002
Installation of the Air-Conditioning System Controller
AMM 21-61-41-000-001
Removal of the Anti-Ice Valve
AMM 21-61-41-400-001
Installation of the Anti-Ice Valve
AMM 21-61-51-000-003
Removal of the Air-Inlet Flap Mechanism
AMM 21-61-51-400-003
Installation of the Air-Inlet Flap Mechanism
AMM 21-61-53-000-001
Removal of the Turbine Bypass Valve
AMM 21-61-53-400-001
Installation of the Turbine Bypass Valve
AMM 21-63-00-720-001
Functional Test of the Cockpit and Cabin Temperature Control without CFDS/MCDU.
AMM 32-69-00-740-001
BITE Check of Landing-Gear Control Interface-Unit (LGCIU) With Use of MCDU to Ensure that Continuous BITE is Operative
3. Fault Confirmation
Subtask 21-61-00-710-114-C ** ON A/C NOT FOR ALL
A. Test
NOTE: Do the steps (6) and (7) in less than 120 s, if not, the control of the zone temperature stabilizes.
   (1) Do the check of the ram-air inlet door mechanism for excessive backlash.
   (2) Do the pre-conditioning with the APU AMM 12-33-21-618-001.
   (3) Make sure that the pack 2 inlet-pressure indication on the ECAM BLEED page is > 20 PSI.
   (4) Set the selectors COCKPIT, FWD CABIN and AFT CABIN, which are installed on the panel 30VU, to HOT for 10 minutes.
   (5) Check of ram-air outlet airflow
WARNING: BE CAREFUL WHEN YOU DO THIS PROCEDURE. THE AIRFLOW CAN BE HOT AND HOT AIR CAN CAUSE BURNS.
     (a) Do a check to see that there is airflow at the pack 2 ram-air outlet.
   (6) Set the selectors COCKPIT, FWD CABIN and AFT CABIN to COLD.
   (7) On the ECAM BLEED page do a check of the pack 2 discharge temperature (referred to as PDT 2).
NOTE: The PDT 2 increases regularly (because of the pack de-icing operation).
Subtask 21-61-00-710-114-D ** ON A/C NOT FOR ALL
A. Test
NOTE: Do the steps (6) and (7) in less than 120 s, if not, the control of the zone temperature stabilizes.
   (1) Do the check of the ram-air inlet door mechanism for excessive backlash.
   (2) Do the pre-conditioning with the APU AMM 12-33-21-618-001.
   (3) Make sure that the pack 2 inlet-pressure indication on the ECAM BLEED page is > 20 PSI.
   (4) Set the selectors COCKPIT, FWD CABIN and AFT CABIN, which are installed on the panel 30VU, to HOT for 10 minutes.
   (5) Check of ram-air outlet airflow
WARNING: BE CAREFUL WHEN YOU DO THIS PROCEDURE. THE AIRFLOW CAN BE HOT AND HOT AIR CAN CAUSE BURNS.
     (a) Do a check to see that there is airflow at the pack 2 ram-air outlet.
   (6) Set the selectors COCKPIT, FWD CABIN and AFT CABIN to COLD.
   (7) On the ECAM BLEED page do a check of the pack 2 discharge temperature (referred to as PDT 2).
4. Fault Isolation
Subtask 21-61-00-810-271-A ** ON A/C NOT FOR ALL
A. If the bypass valve (30HH) is always in half open position:
Subtask 21-61-00-810-132-B
B. If the ram-air inlet doors are closed and the ram-air inlet door-mechanism has more than 20mm backlash:
   (1) If the ram air inlet door mechanism is in the correct condition and there is no airflow at the pack 2 ram-air outlet (on the BLEED page the flow control valve is open):
Subtask 21-61-00-810-143-A
C. If the PDT 2 is below 10 Deg.C (during the test para. 3.A.(4), (6), (7)):
  • no other maintenance action is necessary.
Subtask 21-61-00-810-134-A ** ON A/C NOT FOR ALL
D. If the PDT 2 is above 10 Deg.C for less than 11 minutes, with the selectors COCKPIT, FWD CABIN and AFT CABIN, which are installed on the panel 30VU, set to COLD:
  • no other maintenance action is necessary.
Subtask 21-61-00-810-135-A ** ON A/C NOT FOR ALL
E. If the PDT 2 is above 10 Deg.C for more than 11 minutes, with the selectors COCKPIT, FWD CABIN and AFT CABIN, which are installed on the panel 30VU, set to COLD:
  • open and close the CBs 21HH, 22HH, 23HH, and 24HH.
   (1) If the PDT 2 goes below 10 Deg.C:
   (2) If the fault continues:
     (a) Remove the inspection panel from the pack 2 ram-air inlet plenum (11HM14).
     (b) Do a check of the water injector nozzle for damage or wear:
     (c) Do a check of the main heat exchanger (11HM7) for contamination:
  • If the main heat exchanger is clogged do the cleaning of the HEAT EXCHANGER-MAIN [11HM7] and the HEAT EXCHANGER-PRIMARY [11HM6] AMM 21-52-00-100-001.
     (d) Install the inspection panel on the pack 2 ram-air inlet plenum (11HM14).
   (3) If the fault continues:
  • do a check that the resistance of the water extractor temperature sensor (31HH) measured between connector A/E and A/F and connector A/C and A/D is in these limits ASM 216102:
Temp (Deg.C)
OHMS
+ 10
18820 +/- 5 %
+ 18
13340 +/- 5 %
+ 25
10000 +/- 5 %
+ 30
8197 +/- 5 %
+ 40
5598 +/- 5 %
+ 50
3903 +/- 5 %
     (a) If the resistance values are out of the specified limits:
   (4) If the fault continues:
   (5) If the fault continues:
  • do a check of the position of the manual override lever of the pack 2 anti-ice valve (37HH).
     (a) If the valve is not closed:
  • disconnect the electrical connector (37HHA) AMM 21-61-41-000-001.
  • do a check for 28 VDC at the electrical connector (37HHA) between pins A and B ASM 216102.
       1 If the voltage is correct:
       2 If the fault continues:
       3 If the voltage is not correct:
  • do a check and repair the wiring ASM 216102 from:
  • the VALVE (37HH) to the PC 2 (27HH) and,
  • the VALVE (37HH) to ground.
   (6) If the fault continues:
   (7) If the fault continues:
     (a) Do a check of the reheater (11HM3) for contamination AMM 21-52-00-780-001.
NOTE: This sub-paragraph is only applicable to reheaters with the P/N 755A0000-04 and previous.
It is not applicable to reheaters with the P/N's 755A0000-04 Amendment A or subsequent.
     (b) If the reheater is clogged:
   (8) If the fault continues:
   (9) If the fault continues:
  • do a check of the position of the manual override lever of the pack 2 flow control-valve (8HB).
     (a) If the valve is not fully open:
   (10) If the fault continues:
Subtask 21-61-00-810-133-A ** ON A/C NOT FOR ALL
F. If you cannot confirm this fault on the ground, but during the last flight a high PDT 2 (above 10 Deg.C) was reported:
   (1) If the fault continues:
  • do a check for a ground signal at the PC 2 (27HH) connector AA/9B ASM 216101.
     (a) If there is no ground signal:
  • do a check and repair the wiring if necessary between:
    PC 2 (27HH) connector AA/9B and LGCIU 2 (5GA2) connector AB/3J ASM 216101.
       1 If the fault continues:
     (b) If the test gives a different maintenance message refer to the Fault Symptom List.
     (c) If there is a ground signal:
Subtask 21-61-00-810-135-D ** ON A/C NOT FOR ALL
G. If the PDT 2 is above 10 Deg.C with the selectors COCKPIT, FWD CABIN and AFT CABIN, which are installed on the panel 30VU, set to COLD:
  • open and close the CBs 53HH, 54HH, 55HH and 56HH.
   (1) If the PDT 2 goes below 10 Deg.C:
   (2) If the fault continues:
     (a) Remove the inspection panel from the pack 2 ram-air inlet plenum (11HM14).
     (b) Do a check of the water injector nozzle for damage or wear:
     (c) Do a check of the main heat exchanger (11HM7) for contamination:
  • if the main heat exchanger is clogged do the cleaning of the HEAT EXCHANGER-MAIN [11HM7] and the HEAT EXCHANGER-PRIMARY [11HM6] AMM 21-52-00-100-001.
     (d) Install the inspection panel on the pack 2 ram-air inlet plenum (11HM14).
   (3) If the fault continues:
  • do a check that the resistance of the water extractor temperature sensor (31HH) measured between connector A/E and A/F and connector A/C and A/D is in these limits ASM 216102:
Temp (Deg.C)
OHMS
+ 10
18820 +/- 5 %
+ 18
13340 +/- 5 %
+ 25
10000 +/- 5 %
+ 30
8197 +/- 5 %
+ 40
5598 +/- 5 %
+ 50
3903 +/- 5 %
     (a) If the resistance values are out of the specified limits:
   (4) If the fault continues:
   (5) If the fault continues:
   (6) If the fault continues:
     (a) Do a check of the reheater (11HM3) for contamination AMM 21-52-00-780-001.
NOTE: This sub-paragraph is only applicable to reheaters with the P/N 755A0000-04 and previous.
It is not applicable to reheaters with the P/N's 755A0000-04 Amendment A or subsequent.
     (b) If the reheater is clogged:
   (7) If the fault continues:
   (8) If the fault continues:
  • do a check of the position of the manual override lever of the pack 2 flow control-system (24HB).
     (a) If the valve is not fully open:
   (9) If the fault continues:
Subtask 21-61-00-810-133-B ** ON A/C NOT FOR ALL
H. If you cannot confirm this fault on the ground, but during the last flight a high PDT 2 (above 10 Deg.C) was reported:
   (1) If the fault continues:
  • do a check for a ground signal at the ACSC2 (57HH) connector AB/2H ASM 216101.
     (a) If there is no ground signal:
  • do a check and repair the wiring if necessary between:
    ACSC2 (57HH) connector AB/2H and LGCIU 2 (5GA2) connector AB/3J ASM 216101.
       1 If the fault continues:
         a If the test gives a different maintenance message refer to the Fault Symptom List.
     (b) If there is a ground signal:
Subtask 21-61-00-710-115-A
I. Do the test as given in the Para. 3.A.
5. Close-up
Subtask 21-61-00-860-082-A
A. Put the aircraft back to its initial configuration.
[Rev.8 from Aug 2018] 2026.04.04 04:24:55 UTC
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