W DOC AIRBUS | TSM A320F

Pack 1 Flow Indication Fault

TASK 21-51-00-810-813-A
Pack 1 Flow Indication Fault

1. Possible Causes
  • P2 FLOW CTL VALVE [8HB]
  • P1 FLOW SENSOR [10HB]
  • P1 PRESS INL SENSOR [16HH]
  • wiring
  • P1 FLOW CTL VALVE [11HB]
  • SENSOR-PRESS, PACK 1 INLET [23HB1]
  • SENSOR-DELTA P, PACK 1 [23HB2]
  • FLOW CTL UNIT - PACK 1 [23HB]
  • SENSOR-COMPRESSOR PNEUMATIC OVHT [10HM9]
  • P1 OZONE FILTER [100HM]
  • REHEATER [10HM3]
  • PRESS CONT 1 [11HL]
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 12-33-21-618-001
Pre-conditioning through the LP Ground Connection
AMM 21-31-34-000-001
Removal of the Cabin Pressure Controller
AMM 21-31-34-400-001
Installation of the Cabin Pressure Controller
ASM 215101
AMM 21-51-11-000-001
Removal of the Differential Pressure Sensor
AMM 21-51-11-400-001
Installation of the Differential Pressure Sensor
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 21-51-41-000-001
Removal of the Ozone Filter
AMM 21-51-41-400-001
Installation of the Ozone Filter
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 21-52-31-000-001
Removal of the Reheater
AMM 21-52-31-400-001
Installation of the Reheater
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 21-61-18-000-001
Removal of the Compressor Pneumatic Overheat-Sensor
AMM 21-61-18-400-001
Installation of the Compressor Pneumatic Overheat-Sensor
AMM 71-00-00-710-003
Engine Automatic Start
AMM 71-00-00-710-028
Engine Shutdown
3. Fault Confirmation
Subtask 21-51-00-860-066-A
A. Bleed Air Supply Source from the HP Ground Connection
NOTE: The HP ground supply source must be able to give a pack inlet pressure of 24 PSI minimum. If it can not do this then you must get the bleed air supply from the engines.
The work steps which follow show the conditions necessary before you get the minimum pack-inlet pressure.
   (1) Do the pre-conditioning through the HP ground connection AMM 12-33-21-618-001.
   (2) On the AIR COND panel 30VU:
  • push the HOT AIR pushbutton switch to the on position (the OFF legend goes off),
  • turn the COCKPIT, FWD CABIN and the AFT CABIN temperature selectors to the HOT positions and,
  • make sure that the PACK 1 and the PACK 2 pushbutton switches are in the on position (the OFF legends are off).
   (3) On the ECAM BLEED page:
  • make sure that the pack 1 inlet pressure indication shows a minimum of 24 PSI.
NOTE: If the indication shows less than 24 PSI you must:
  • increase the ground pressure supply until the indication shows a minimum of 24 PSI.
Subtask 21-51-00-860-067-A ** ON A/C NOT FOR ALL
B. Start the engines AMM 71-00-00-710-003 if necessary.
Subtask 21-51-00-860-068-A
C. Initial Test Set-up with Engines as Bleed Air Source Supply
   (1) On the AIR COND panel 30VU:
  • push the HOT AIR pushbutton switch to the on position (the OFF legend goes off),
  • turn the COCKPIT, FWD CABIN and the AFT CABIN temperature selectors to the HOT positions and,
  • make sure that the PACK 1 and the PACK 2 pushbutton switches are in the on position (the OFF legends are off).
   (2) On the ECAM BLEED page:
  • make sure that the pack 1 inlet pressure indication shows a minimum of 24 PSI.
NOTE: If the indication shows less than 24 PSI you must slowly adjust the throttle levers until you get the minimum indication of 24 PSI.
Subtask 21-51-00-710-072-A
D. Test
ACTION
RESULT
1.On the AIR COND panel 30VU:
  • turn the PACK FLOW selector to the LO position and wait for 120 sec.
On the ECAM BLEED page:
  • the pack 1 flow indication shows between the LO and the 11 o'clock positions.
2.On the AIR COND panel 30VU:
  • push the PACK 2 P/BSW and wait for 120 sec.
On the AIR COND panel 30VU:
  • the OFF light of the PACK 2 P/BSW comes on.

On the ECAM BLEED page:
  • the pack 1 flow indication shows between the 1 o'clock and the HI positions.
3.On the AIR COND panel 30VU:
  • push the PACK 2 P/BSW.
On the AIR COND panel 30VU:
  • the OFF light of the PACK 2 P/BSW goes off.
4.On the AIR COND panel 30VU:
  • turn the PACK FLOW selector to the NORM position and wait for 120 sec.
On the ECAM BLEED page:
  • the pack 1 flow indication shows between the 11 o'clock and the 1 o'clock positions.
5.On the AIR COND panel 30VU:
  • turn the PACK FLOW selector to the HI position and wait for 120 sec.
On the ECAM BLEED page:
  • the pack 1 flow indication shows between the 1 o'clock and the HI positions.
4. Fault Isolation
Subtask 21-51-00-810-083-B ** ON A/C NOT FOR ALL
A. If the pack 1 flow indicator on the ECAM BLEED page is stuck in the high position:
NOTE: Do the following step (1) only if the opposite FCV is of the standard:
  • PN 1303A0000-02 without additional Amendment
   (1) Replace the P2 FLOW CTL VALVE [8HB] of the opposite pack (pack 2) AMM 21-51-51-000-001 AMM 21-51-51-400-001.
   (2) If the fault continues:
  • do a leakage check of the sense line between the angled connector of the pressure-sensor(10HB) and the downstream pressure-port at the FCV (11HB), and replace if necessary.
   (3) If the fault continues:
   (4) If the fault continues:
   (5) If the fault continues:
  • do a check and repair the wiring of the opposite FCV (8HB) between the:
  • FCV connector (8HB-A) pin C and the PC connector (7HH-AA) pin B7.
  • FCV connector (8HB-A) pin D and the PC connector (27HH-AB) pin B6.
  • FCV connector (8HB-A) pin B and GND ASM 215101.
   (6) If the fault continues:
   (7) If the fault continues:
  • do a check and repair the wiring between the:
  • FCV connector (11HB-A) pin C and the PC connector (27HH-AA) pin B7.
  • FCV connector (11HB-A) pin D and the PC connector (7HH-AB) pin B6.
  • FCV connector (11HB-A) pin B and GND ASM 215101.
Subtask 21-51-00-810-085-E ** ON A/C NOT FOR ALL
B. If the pack 1 flow indicator on the ECAM BLEED page is stuck in the low position:
   (1) Do a leakage check of the sense-line between the in-line-connector of the pressure-sensor (10HB), and the upstream port at the FCV (11HB), and replace if necessary.
   (2) If the fault continues:
   (3) If the fault continues:
  • do a leakage check the sense-line between the CPNOH (10HM9) and the FCV (11HB), and replace if necessary.
   (4) If the fault continues:
   (5) If the fault continues:
   (6) If the fault continues:
   (7) If the fault continues:
   (8) If the fault continues:
Subtask 21-51-00-810-083-C ** ON A/C NOT FOR ALL
C. If the pack 1 flow indicator on the ECAM BLEED page is stuck in the high position:
   (1) Replace the SENSOR-PRESS, PACK 1 INLET [23HB1] AMM 21-51-13-000-001 AMM 21-51-13-400-001.
   (2) If the fault continues:
   (3) If the fault continues:
   (4) If the fault continues:
  • do a check and repair the wiring ASM 215101 from:
  • the FCS (23HB) to the ACSC1 (47HH) and,
  • the FCS (23HB) to ground.
Subtask 21-51-00-810-085-F ** ON A/C NOT FOR ALL
D. If the pack 1 flow indicator on the ECAM BLEED page is stuck in the low position:
   (1) If the fault continues:
   (2) If the fault continues:
   (3) If the fault continues:
   (4) If the fault continues:
Subtask 21-51-00-810-106-A
E. If the fault continues:
Subtask 21-51-00-710-073-A
F. Do the test as given in the Para. 3.D.
5. Close-up
Subtask 21-51-00-860-069-A ** ON A/C NOT FOR ALL
A. Stop the engines AMM 71-00-00-710-028 or the preconditioning through the HP ground connection AMM 12-33-21-618-001 (as applicable).
[Rev.8 from Aug 2018] 2026.04.04 04:24:47 UTC
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