W DOC AIRBUS | AMM A320F

Operational Check of AC ESS Generation Switching

TASK 24-25-00-710-001-A
Operational Check of AC ESS Generation Switching

ZONE: 210
1. Reason for the Job
Refer to the MPD TASK: 242500-01
OPERATIONAL CHECK OF AC ESS GENERATION SWITCHING
Make sure that it is possible to energize the AC ESS and AC SHED ESS busbars:
  • With the AC2 normal busbar
  • When the AC1 busbar is no longer energized.
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
AR
SAFETY CLIP - CIRCUIT BREAKER
 B. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
210
CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD
 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
TSM 24-35-00-810-810
Loss of the DC ESS Busbar
3. Job Set-up
Subtask 24-25-00-860-050-A
A. Aircraft Maintenance Configuration
   (1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
   (2) Do the EIS start procedure (upper ECAM DU and lower ECAM DU only)
(Ref. AMM TASK 31-60-00-860-001).
Subtask 24-25-00-865-050-A
B. Make sure that this(these) circuit breaker(s) is(are) closed:
PANELDESIGNATIONFINLOCATION
** ON A/C ALL
106VUAC ESS BUS/STBY/CNTOR/CTL5XCB08
106VUAC ESS/BUS NORM/CNTOR/CTL4XCB03
122VUELEC/AC/BUS1/CTL17XN1V25
123VUAC ESS/BUS ON/BUS 11XCAC12
123VUAC ESS/BUS ON/BUS 22XCAC01
Subtask 24-25-00-865-051-A
WARNING: OPEN THE CIRCUIT BREAKERS THAT FOLLOW:
  • THE PITOT PROBE HEATER CIRCUIT BREAKERS 3DA2 AND 3DA3
  • THE TAT PROBE CIRCUIT BREAKER 1DA1.
IF YOU DO NOT OBEY THIS PRECAUTION:
  • THE PROBES (PITOT, TAT) WILL BECOME HOT, AND
  • THE PROBE (PITOT, TAT) COVERS WILL MELT.
THERE IS A RISK OF INJURY TO PERSONS.
C. Open, safety and tag this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C ALL
122VUANTI ICE/PROBES/2/PITOT3DA2Y14
122VUANTI ICE/PROBES/3/PITOT3DA3Z16
122VUANTI ICE/PROBES/1/TAT1DA1Z12
4. Procedure
Subtask 24-25-00-710-050-B
A. Operational Test of the AC Essential-Generation Switching
ACTION
RESULT
1.On the ECAM control panel:
  • Push the ELEC key.
On the ECAM DU, on the "ELEC" page:
  • A green line comes into view between the AC1 and AC ESS busbars. This shows that the AC1 busbar energizes the AC ESS busbar.
2.On AC power center 123VU:
  • Open circuit breaker 1XC.
On F/O glareshield panel 130VU:
  • The MASTER legend light of the F/O master-caution pushbutton-switch comes on.

    On CAPT glareshield panel 131VU:
  • If the CAUT legend light of the CAPT master-caution pushbutton-switch comes on, ignore it.

You can hear the single chime.

These indications come into view on the ECAM DU:
  • "ELEC AC ESS BUS FAULT", and
  • "AC ESS FEED…….ALTN".
NOTE: During this test, the upper ECAM will not be available. If the lower ECAM is not serviceable (MEL condition), it is necessary to set the ECAM/ND XFR selector switch to the F/O position to get the EWD on the ND DU. The "ECAM" page is shown on the F/O ND DU. The single display mode is used because there is only one DU available for all the ECAM functions.


On ELEC panel 35VU:
  • The FAULT legend of the AC ESS FEED pushbutton switch comes on.
3.On rear circuit-breaker panel 122VU:
  • Open circuit breaker 17XN1.
  • Wait for 3 seconds to let the auto switching system set on.
On ELEC panel 35VU:
  • The FAULT legend of the AC ESS FEED pushbutton switch goes off.
  • The ALTN legend of the AC ESS FEED pushbutton switch stays off.
4.On the ECAM control panel:
  • Push the ELEC key.
On the ECAM DU, on the "ELEC" page:
  • A green line comes into view between the AC2 and AC ESS busbars. This shows that the AC2 busbar energizes the AC ESS busbar.
  • The green line between the AC1 and AC ESS busbars goes out of view.
NOTE: During this test, if the ELEC key of the ECAM control panel does not operate (but the ALL and CLEAR keys do) and the "DC ESS LOSS" indication comes into view, the loss of the DC ESS busbar is a possible cause of this failure TSM 24-35-00-810-810.
5.On the EMER ELEC PWR section of panel 21VU:
  • Lift the safety guard.
  • Push and hold the EMER GEN TEST pushbutton switch.
On the ECAM DU, on the "ELEC" page:
  • The AC2 busbar energizes the AC ESS busbar.
6.On AC power-center 123VU:
  • Close circuit breaker 1XC.

7.On rear circuit-breaker panel 122VU:
  • Close circuit breaker 17XN1.
On the ECAM DU, on the "ELEC" page:
  • The AC2 busbar continues to supply the AC ESS busbar.
8.On the EMER ELEC PWR section of panel 21VU:
  • Release the EMER GEN TEST pushbutton switch.
On the EMER ELEC PWR section of panel 21VU:
  • Make sure that the safety guard goes back to its initial position.

On the ECAM DU, on the "ELEC" page:
  • The green line between the AC2 and the AC ESS busbars goes out of view.
  • The green line between the AC1 and the AC ESS busbars comes into view. This shows that the AC1 busbar energizes the AC ESS busbar.
9.On AC power-center 123VU:
  • Open circuit breaker 1XC.
On F/O glareshield panel 130VU:
  • The MASTER legend light of the F/O master-caution pushbutton-switch comes on.

    On the CAPT glareshield panel 131VU:
  • If the CAUT legend light of the CAPT master-caution pushbutton-switch comes on, ignore it.

You can hear the single chime.

These indications come into view on the ECAM DU:
  • "ELEC AC ESS BUS FAULT", and
  • "AC ESS FEED…….ALTN".

On ELEC panel 35VU:
  • The FAULT legend of the AC ESS FEED pushbutton switch comes on.
10.On ELEC panel 35VU:
  • Release the AC ESS FEED pushbutton switch.
On ELEC panel 35VU:
  • The FAULT legend of the AC ESS FEED pushbutton switch goes off.
  • The ALTN legend of the AC ESS FEED pushbutton switch comes on.
11.On the ECAM control panel:
  • Push the ELEC key.
On the ECAM DU, on the "ELEC" page:
  • A green line comes into view between the AC2 and AC ESS busbars. This shows that the AC2 busbar energizes the AC ESS busbar.
  • The green line between the AC1 and AC ESS busbars goes out of view.
12.On AC power center 123VU.
  • Close circuit breaker 1XC.

13.On ELEC panel 35VU:
  • Push the AC ESS FEED pushbutton switch.
On ELEC panel 35VU:
  • The ALTN legend of the AC ESS FEED pushbutton switch goes off.

On the "ELEC" page:
  • The green line between the AC2 and AC ESS busbars goes out of view.
  • The green line between the AC1 and AC ESS busbars comes into view.
5. Close-up
Subtask 24-25-00-865-052-A
A. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C ALL
122VUANTI ICE/PROBES/2/PITOT3DA2Y14
122VUANTI ICE/PROBES/3/PITOT3DA3Z16
122VUANTI ICE/PROBES/1/TAT1DA1Z12
Subtask 24-25-00-860-051-A
B. Put the aircraft back to its initial configuration.
   (1) Do the EIS stop procedure
(Ref. AMM TASK 31-60-00-860-002).
   (2) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).
[Rev.10 from 2021] 2026.04.01 05:48:30 UTC
"Aviabrain" 2025