W DOC AIRBUS | TSM A320F

FCV 2 (FCU 2) Regulation/Indication Fault

TASK 21-51-00-810-808-A
FCV 2 (FCU 2) Regulation/Indication Fault

1. Possible Causes
  • sense lines connectors
  • P2 FLOW SENSOR [9HB]
  • P2 FLOW CTL VALVE [8HB]
  • wiring
  • P1 FLOW CTL VALVE [11HB]
  • FLOW CTL UNIT - PACK 1 [23HB]
  • FLOW CTL UNIT - PACK 2 [24HB]
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
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 21-51-51-000-001
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 71-00-00-710-003
Engine Automatic Start
AMM 71-00-00-710-028
Engine Shutdown
3. Fault Confirmation
Subtask 21-51-00-860-061-B
A. Bleed Air Supply Source from the Engines
   (1) Start the engines, Ref. Para. 3.B, to supply the bleed air.
Subtask 21-51-00-860-062-A ** ON A/C NOT FOR ALL
B. Start the engines AMM 71-00-00-710-003 if necessary.
Subtask 21-51-00-860-063-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 2 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 21-51-00-860-065-B
D. AIDS ALPHA CALL-UP menu
ACTION
RESULT
1.On one MCDU:
  • press the line key adjacent to the AIDS indication.
On the MCDU:
  • the AIDS menu page shows.
- press the line key adjacent to the CALL-UP PARAM indication.
  • the AIDS PARAM CALL-UP page shows.
- press the line key adjacent to the PARAM ALPHA CALL-UP indication.
  • the AIDS ALPHA CALL-UP page shows.
2.On the MCDU keyboard:
  • press the up or down arrow keys (to scroll the page).
On the MCDU:
  • empty box indications show in lines.
- press the P and F keys.
In the lower left corner of the AIDS ALPHA CALL-UP page:
- PF shows.
3.On the MCDU:
  • press the line key adjacent to one of the empty box line indications.
On the AIDS ALPHA CALL-UP page:
- ALPHA, SOURCE and POS.VALUE columns show.
Below the ALPHA column:
- the indications <PF and KG/SE show.
Below the SOURCE column:
- the indications PACK-1 and PACK-2 show.
Below the POS.VALUE column:
- the indications 1:.XX and 2:.XX show.
NOTE: XX indicates the actual pack flow values (KG/SE)
Subtask 21-51-00-710-064-C
E. Test
ACTION
RESULT
1.On the AIR COND panel 30VU:
  • turn the PACK FLOW selector to the NORM position and wait for 120 sec.
On the MCDU at the AIDS ALPHA CALL-UP page:
  • under the POS VALUE column the indication 2: shows between .47 and .63 (KG/SE).
4. Fault Isolation
Subtask 21-51-00-810-076-E ** ON A/C NOT FOR ALL
A. On the MCDU / AIDS ALPHA CALL-UP page if the POS VALUE indication 2: does not agree with the flow indication parameters:
  • make sure that the torque of the sense lines connectors at the flow control valve and related sensor is correct AMM 21-51-11-400-001 and AMM 21-51-51-400-001 and,
  • the sense lines are in a good condition.
   (1) If the fault continues:
   (2) If the fault continues:
   (3) 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.
    ASM 215101.
   (4) If the fault continues:
Subtask 21-51-00-810-076-F ** ON A/C NOT FOR ALL
A. On the MCDU / AIDS ALPHA CALL-UP page if the POS VALUE indication 2: does not agree with the flow indication parameters:
   (1) If the fault continues:
   (2) If the fault continues:
Subtask 21-51-00-710-065-A
B. Do the test as given in the Para. 3.A.
5. Close-up
Subtask 21-51-00-860-057-C
A. Stop the engines AMM 71-00-00-710-028.
[Rev.8 from Aug 2018] 2026.04.04 04:24:46 UTC
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