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Failure of the Extract Fan A320

1. Possible Causes:

-FAN-EXTRACT, AVNCS VENT (18HQ)

-C/B-AVNCS VENT/EXTC/FAN (2HQ)

-CNTOR-EXTRACT FAN CTL, AVNCS VENT (7HQ)

-AEVC (10HQ)

-C/B-AIR COND/AVNCS VENT/CTL (6HQ)

— (31HQ)

-PRESS SW-EXTRACT FAN, AVNCS VENT (30HQ)

-wiring

-wiring between 31-HQ— (CONT-AVNCS VENT FANS SPD) 31HQ and 18-HQ— (FAN-EXTRACT, AVNCS VENT) 18HQ

2. Job Set-up Information

A. Referenced Information

REFERENCEDESIGNATION
Ref. 21-26-00-810-804-AFailure of the Skin Air-Outlet Valve
Ref. 24-00-00-810-803-ACircuit Breaker Tripped and/or C/B TRIPPED Warning
Ref. ESPM 20-45-24
Ref. ESPM 20-45-24
Ref. ESPM 20-52-11
Ref. AMM 21-26-00-710-001Operational Check of the Avionics Equipment Ventilation-System via MCDU
Ref. AMM 21-26-00-710-008Operational Test to Read the CFDS for CLASS 3 Faults of the AEVC
Ref. AMM 21-26-00-710-009Operational Test to Read the CFDS for LAST LEG REPORT of the AEVC
Ref. ASM 21-26-02
Ref. AMM 21-26-11-000-001Removal of the Avionics-Ventilation Blower and Extract Fan Pressure-Switches
Ref. AMM 21-26-11-400-001Installation of the Blower and Extract Fan Pressure-Switches
Ref. AMM 21-26-34-000-001Removal of the Avionics Equipment Ventilation Computer (AEVC)
Ref. AMM 21-26-34-400-001Installation of the Avionics Equipment Ventilation Computer (AEVC)
Ref. AMM 21-26-35-000-001Removal of the Avionics Ventilation Fans Speed Controller
Ref. AMM 21-26-35-400-001Installation of the Avionics Ventilation Fans Speed Controller
Ref. AMM 21-26-51-000-001Removal of the Extract and Blower Fans
Ref. AMM 21-26-51-400-001Installation of the Extract and Blower Fans

3.Fault Confirmation

SUBTASK 21-26-00-865-054-A

A. Table of the circuit breakers used in this procedure:

PANELDESIGNATIONFINLOCATION
49VUAIR COND/AVNCS VENT/CTL6HQD06
122VUAIR COND/AVNCS/VENT/MONG3HQY17
123VUAVNCS VENT/EXTC/FAN2HQAE02

SUBTASK 21-26-00-710-092-B

B. Test:

(a) Open the circuit breaker AIR COND/AVNCS/VENT/MONG (3HQ).

(b) Wait for five seconds.

(c) Close the circuit breaker AIR COND/AVNCS/VENT/MONG (3HQ).

  • (2) Do the operational test of the avionics equipment ventilation from the Multipurpose Control and Display Unit (MCDU) Ref. AMM 21-26-00-710-001
  • (3) Read the LAST LEG REPORT Ref. AMM 21-26-00-710-009
  • (4) Read the CLASS 3 faults of the AEVC Ref. AMM 21-26-00-710-008
  • (5) If the logbook or the Post Flight Report (PFR) gives the ECAM warnings VENT EXTRACT FAULT and the VENT SKIN VALVE FAULT:
    • -Do the troubleshooting procedure of the skin air-outlet valve Ref. TSM TASK 21-26-00-810-804
  • (6) If the fault continues:
    • Go to the Para. Fault Isolation.

4. Fault Isolation

SUBTASK 21-26-00-810-073-A

A. If the test gives the maintenance message EXTRACT FAN 18HQ

NOTE: The extract fan can have different part numbers. The number of indication lights of the extract fan can be different from one part number to other part number.

  • (1) On the extract fan (18HQ), do a check of the status of the warning light:
    • (a) On the FAN-EXTRACT, AVNCS VENT (18HQ) not fitted with Ball Bearing Health Monitoring :
      • 1 If the RED light was on, push the RESET pushbutton switch of the FAN-EXTRACT, AVNCS VENT (18HQ) for a minimum of 2 seconds.
      • 2 If the RED light was on and went off after the reset, go to step (2).
      • 3 If the RED light was on and did not go off after the reset, replace theFAN-EXTRACT, AVNCS VENT (18HQ) Ref. AMM 21-26-51-000-001 and Ref. AMM 21-26-51-400-001
    • (b) On the FAN-EXTRACT, AVNCS VENT (18HQ) fitted with Ball Bearing Health Monitoring (P/N EVT3454HM01):
      • 1 If the AMBER light was on, push the RESET pushbutton switch of the FAN-EXTRACT, AVNCS VENT (18HQ) for a minimum of 2 seconds and go to step (2).

NOTE: The AMBER light can be an indication that the FAN-EXTRACT, AVNCS VENT (18HQ) is degraded. It is recommended to continue to monitor the fan and replace it Ref. AMM 21-26-51-000-001 and Ref. AMM 21-26-51-400-001 at the next maintenance opportunity.

  • 2 If the RED light was on, push the RESET pushbutton switch of the FAN-EXTRACT, AVNCS VENT (18HQ) for a minimum of 2 seconds :

— If the RED light went off after the reset, go to step (2).

— If the RED light did not go off after the reset, replace the FAN-EXTRACT, AVNCS VENT (18HQ) Ref. AMM 21-26-51-000-001 and Ref. AMM 21-26-51-400-001

  • (2) If all warning lights are off:
    • (a) Do a check of the status of the C/B-AVNCS VENT/EXTC/FAN (2HQ).
    • (b) Go to the next step.
  • (3) If the C/B-AVNCS VENT/EXTC/FAN (2HQ) is open :

— Do the procedure Ref. TSM TASK 24-00-00-810-803

  • (a) If the fault continues:
    • — On panel 107VU, do a visual inspection of connector 1278VC Ref. ESPM 20-52-11
  • (b) If the fault continues :
    • — Replace the CNTOR-EXTRACT FAN CTL, AVNCS VENT (7HQ) Ref. ESPM 20-45-24
  • (c) If the fault continues :
    • — Replace the FAN-EXTRACT, AVNCS VENT (18HQ) Ref. AMM 21-26-51-000-001 and Ref. AMM 21-26-51-400-001
  • (d) If the fault continues :
    • — Replace the C/B-AVNCS VENT/EXTC/FAN (2HQ).
  • (e) If the fault continues :
    • — Replace the AEVC (10HQ) Ref. AMM 21-26-34-000-001 and Ref. AMM 21-26-34-400-001
  • (4) If the AVNCS VENT/EXTC/FAN circuit breaker (2HQ) is closed:
    • -On panel 107VU, do a visual inspection of connector 1278VC Ref. ESPM 20-52-11
    • -Do a check for 115VAC at pins A/J, A/K, A/L of the extract fan (18HQ).
  • (a) If there is no 115VAC:
    • — Do a check for 115VAC at pins T1, T2, T3 of the extract-fan control contactor (7HQ).
    • 1 If there is no 115VAC:
      • Do a check of the wiring Ref. ASM 21-26-02 between the extract-fan control contactor (7HQ) pins L1, L2, L3 and the AVNCS VENT/EXTC/FAN circuit breaker (2HQ) pins A2, B2, C2.
      • a If the wiring is not correct:
        • Repair the related wiring.
      • b If the wiring is correct:
        • — Replace C/B-AVNCS VENT/EXTC/FAN (2HQ).
    • 2 If there is 115VAC:
      • — Do a check of the status of the AIR COND/AVNCS VENT/CTL circuit breaker (6HQ).
        • a If the AIR COND/AVNCS VENT/CTL circuit breaker (6HQ) is closed:
          • — Do a check for 28VDC at pin A/E of the extract fan (18HQ).

* If there is no 28VDC:

* — Do a check of the wiring Ref. ASM 21-26-02 between:

* . The extract fan (18HQ) pin A/E and the AIR COND/AVNCS VENT/CTL circuit breaker (6HQ)

* . The extract fan (18HQ) pin A/F and the ground.

** If the wiring is not correct:

** — Repair the related wiring.

** If the wiring is correct:

** — Replace C/B-AIR COND/AVNCS VENT/CTL (6HQ).

* If there is 28VDC:

* — Make sure that the warning light of the extract fan (18HQ) is off.

** If the warning light is on, push the RESET pushbutton switch on the extract fan (18HQ).

NOTE:

The fan starts immediately.

The warning light goes off.

** If the fault continues:

** — Replace FAN-EXTRACT, AVNCS VENT (18HQ) Ref. AMM 21-26-51-000-001 and Ref. AMM 21-26-51-400-001

** If the fault continues:

** — Do a check for 28VDC at pin AA/9A of the AEVC (10HQ) Ref. ASM 21-26-02

*** If there is 28VDC:

*** — Replace AEVC (10HQ) Ref. AMM 21-26-34-000-001 and Ref. AMM 21-26-34-400-001

*** If there is no 28VDC:

*** — Do a check of the wiring Ref. ASM 21-26-02 between:

*** . The AEVC (10HQ), pin AA/9A and the extract-fan control contactor (7HQ), pin Z

*** . The extract-fan control contactor (7HQ), pin X and the extract fan (18HQ), pin A/D.

**** If the wiring is not correct:

**** — Repair the related wiring.

**** If the wiring is correct:

**** — Replace CNTOR-EXTRACT FAN CTL, AVNCS VENT (7HQ) Ref. ESPM 20-45-24

**** If the fault continues:

**** — Replace FAN-EXTRACT, AVNCS VENT (18HQ) Ref. AMM 21-26-51-000-001 and Ref. AMM 21-26-51-400-001

  • b If the AIR COND/AVNCS VENT/CTL circuit breaker (6HQ) is open:

— Do the procedure Ref. TSM TASK 24-00-00-810-803

* If the fault continues:

* — Replace C/B-AIR COND/AVNCS VENT/CTL (6HQ).

  • (b) If there is 115VAC:

— Replace FAN-EXTRACT, AVNCS VENT (18HQ) Ref. AMM 21-26-51-000-001 and Ref. AMM 21-26-51-400-001

  • (5) If the fault continues:

— Disconnect connector 18HQ-A from FAN-EXTRACT, AVNCS VENT (18HQ):

(a) On the connector, on the wiring side, do a check for ground signal at pin A/H of 

FAN-EXTRACT, AVNCS VENT (18HQ):

1 If there is no ground signal:

— Repair the wiring Ref. ASM 21-26-02

(b) Do a check for 115VAC voltage at pins A/A, A/B, A/C, A/J, A/K and A/L of  FAN-EXTRACT, AVNCS VENT (18HQ) :

1 If there is no 115VAC voltage:

— Disconnect connector 31HQ-A from CONT-AVNCS VENT FANS SPD (31HQ).

— Do a check for 115VAC voltage at pins A/A, A/B, A/C, A/J, A/K and A/L of  (31HQ)

a If there is 115VAC voltage:

— Do a check and repair the  wiring between 31-HQ— (CONT-AVNCS VENT FANS SPD) 31HQ and 18-HQ— (FAN-EXTRACT, AVNCS VENT) 18HQ  Ref. ASM 21-26-02

b If there is no 115VAC voltage:

— Replace (31HQ) Ref. AMM 21-26-35-000-001 and Ref. AMM 21-26-35-400-001

(6) If the fault continues:

— Replace PRESS SW-EXTRACT FAN, AVNCS VENT (30HQ) Ref. AMM 21-26-11-000-001 and Ref. AMM 21-26-11-400-001

SUBTASK 21-26-00-710-093-A

B. Do the test given in Para. 3.

5. Close-up

SUBTASK 21-26-00-942-053-A

A. Put the aircraft back to its initial configuration.

(1) Make sure that the work area is clean and clear of tools and other items.

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All instructions and limitations given in those documents that relate to the resetting of systems both on the ground and in the air must be respected. No reset should be attempted without a thorough appreciation of the technical ramifications. No more than one computer should be reset at any one time. No reset should be attempted in flight unless specifically permitted by the QRH. Maintenance messages remaining after a reset require engineering investigation.

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