W DOC AIRBUS | AMM A320F

Operational Test of the Skin-Exchanger Outlet Bypass-Valve without the Centralized Fault Display System (CFDS)

TASK 21-26-55-710-001-A
Operational Test of the Skin-Exchanger Outlet Bypass-Valve without the Centralized Fault Display System (CFDS)

FIN: 16HQ
FIN: 23HQ
FIN: 24HQ
1. Reason for the Job
Test after the removal/installation of the skin-exchanger outlet bypass-valve 23HQ if the CFDS is unserviceable.
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
1
ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
 B. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
812
 C. Referenced Information
REFERENCE
DESIGNATION
TASK 24-41-00-861-002-A
Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01
Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02
Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A
De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01
De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02
De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 31-60-00-860-001-A
EIS Start Procedure
TASK 31-60-00-860-002-A
EIS Stop Procedure
3. Job Set-up
Subtask 21-26-55-861-056-A
A. Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
Subtask 21-26-55-865-059-A
B. Make sure that this(these) circuit breaker(s) is(are) closed:
PANELDESIGNATIONFINLOCATION
** ON A/C ALL
49VUAIR COND/AVNCS VENT/CTL6HQD06
49VUAIR COND/AVNCS VENT/CTL5HQD05
122VUAIR COND/AVNCS/VENT/MONG3HQY17
** ON A/C NOT FOR ALL
123VUAVNCS VENT/EXTC/FAN2HQAE02
** ON A/C ALL
123VUAVNCS VENT/BLOWER/FAN1HQAD10
** ON A/C NOT FOR ALL
123VUAVNCS VENT/EXTC/FAN2HQAC04
Subtask 21-26-55-860-054-A
C. Aircraft Maintenance Configuration
   (1) Make sure that the throttle control levers of the engines 1 and 2 are at idle.
   (2) On the VENTILATION section of the overhead control and indicating panel 22VU:
  • make sure that the BLOWER and EXTRACT pushbutton switches are in the AUTO configuration (pushed with the FAULT and OVRD legends off).
   (3) Do the EIS start procedure (upper ECAM DU and lower ECAM DU only)
(Ref. AMM TASK 31-60-00-860-001).
Subtask 21-26-55-010-054-A
D. Get Access
   (1) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position at the access door 812.
   (2) Open the access door 812.
4. Procedure
Subtask 21-26-55-710-053-A
A. Operational Test of the Skin-Exchanger Outlet Bypass-Valve (23HQ)
ACTION
RESULT
1.On the rear circuit breaker panel 122VU:
  • open the circuit breaker 3HQ.
On the VENTILATION section of the overhead control and indicating panel 22VU:
  • the FAULT legends of the BLOWER and EXTRACT pushbutton switches come on. On the upper ECAM DU:
  • the AVNCS SYS FAULT indication comes into view.
2.On the rear circuit breaker panel 122VU:
  • close the circuit breaker 3HQ.
On the VENTILATION section of the overhead control and indicating panel 22VU:
  • the FAULT legends of the BLOWER and EXTRACT pushbutton switches go off.
    On the upper ECAM DU:
  • the AVNCS SYS FAULT indication goes out of view. In the avionics compartment:
  • make sure that the skin-exchanger outlet bypass-valve 23HQ opens and closes during the automatic test (t = 60 seconds) (look at the position indicator on the valve).
5. Close-up
Subtask 21-26-55-410-055-A
A. Close Access
   (1) Close the access door 812.
   (2) Remove the access platform(s).
Subtask 21-26-55-860-055-A
B. Do the EIS stop procedure
(Ref. AMM TASK 31-60-00-860-002).
Subtask 21-26-55-862-056-A
C. De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).
[Rev.10 from 2021] 2026.04.02 06:11:09 UTC
"WTRUIB" 2025