DOC AIRBUS | AMM A320FInstallation of the DC Shed-Bus Normal-Supply Contactor
TASK 24-61-55-400-002-A
Installation of the DC Shed-Bus Normal-Supply Contactor
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Work Zones and Access Panels
C. Referenced Information
3. Job Set-up
Subtask 24-61-55-860-053-A
Subtask 24-61-55-420-051-A ** ON A/C NOT FOR ALL
Subtask 24-61-55-410-051-A
[Rev.10 from 2021]
2026.03.31 23:25:23 UTC
Installation of the DC Shed-Bus Normal-Supply Contactor
WARNING:
MAKE SURE THAT NO AC OR DC POWER IS CONNECTED TO THE AIRCRAFT ELECTRICAL CIRCUITS.
THERE IS A RISK OF ELECTROCUTION IF THE AC OR DC POWER STAYS CONNECTED.
1. Reason for the JobSelf explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE |
| No specific | AR | WARNING NOTICE(S) |
| No specific | Torque wrench: range to between 0.30 and 0.27 m.daN (26.55 and 23.89 lbf.in )  |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 212 | COCKPIT |
| 121AL |
| 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 25-11-41-000-001-A | Removal of the Third Occupant Seat |
| TASK 25-11-41-400-001-A | Installation of the Third Occupant Seat |
ContactorSubtask 24-61-55-860-053-A
A. Aircraft Maintenance Configuration
(1) Make sure that the ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE is in position at the access door 121AL.
(2) Make sure that the access door 121AL is open.
(3) Make sure that the external power connector is not connected to the aircraft receptacle.
(4) Make sure that on the access door 121AL, a WARNING NOTICE(S) is in position to tell persons not to connect the external power connector.
(5) In the cockpit, on the ELEC panel 35VU, make sure that these pushbutton switches are released:
(8) In the cockpit, make sure that the third occupant seat is removed (Ref. AMM TASK 25-11-41-000-001).
(9) In the cockpit, make sure that the front panel on the bottom right side of the panel 120VU is removed.
Subtask 24-61-55-865-051-A (1) Make sure that the ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE is in position at the access door 121AL.
(2) Make sure that the access door 121AL is open.
(3) Make sure that the external power connector is not connected to the aircraft receptacle.
(4) Make sure that on the access door 121AL, a WARNING NOTICE(S) is in position to tell persons not to connect the external power connector.
(5) In the cockpit, on the ELEC panel 35VU, make sure that these pushbutton switches are released:
- BAT 1, BAT 2.
- APU GEN.
- GEN 1, GEN 2.
- EXT PWR.
- 21VU (EMER ELEC PWR section).
- 25VU (APU section).
- 35VU (ELEC).
(8) In the cockpit, make sure that the third occupant seat is removed (Ref. AMM TASK 25-11-41-000-001).
(9) In the cockpit, make sure that the front panel on the bottom right side of the panel 120VU is removed.
B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:
4. Procedure| PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 122VU | ELEC/DC SHED BUS/CNTR | 9PN | U26 |
| 124VU | SHED BUS 210PP/212PP/SPLY | 11PN | BA01 |
Subtask 24-61-55-420-051-A ** ON A/C NOT FOR ALL
A. Installation of the Contactor
(2) TORQUE the two captive screws (2) to between 0.30 and 0.27 m.daN (26.55 and 23.89 lbf.in ).
(3) Remove the CAP-BLANKING from each electrical connector and receptacle.
(4) Remove the blanking caps from the electrical receptacle (4).
(5) Make sure that all the electrical connections are clean and in the correct condition.
(6) Connect the electrical connector (5) to the electrical receptacle (4).
Subtask 24-61-55-420-051-B ** ON A/C NOT FOR ALL CAUTION:
MAKE SURE THAT THE CONTACTOR LOCATING PIN IS CORRECTLY ENGAGED IN ITS RECESS LOCATED IN ONE POWER TERMINAL.
THIS PREVENTS DAMAGE TO THE LOCATING PIN WHEN YOU APPLY THE TORQUE.
(1) Install the contactor (3) on the contactor base (1). (2) TORQUE the two captive screws (2) to between 0.30 and 0.27 m.daN (26.55 and 23.89 lbf.in )
. (3) Remove the CAP-BLANKING from each electrical connector and receptacle.
(4) Remove the blanking caps from the electrical receptacle (4).
(5) Make sure that all the electrical connections are clean and in the correct condition.
(6) Connect the electrical connector (5) to the electrical receptacle (4).
A. Installation of the Contactor
(2) TORQUE the two captive screws (2) to between 0.30 and 0.27 m.daN (26.55 and 23.89 lbf.in ).
(3) Remove the CAP-BLANKING from each electrical connector and receptacle.
(4) Remove the blanking caps from the electrical receptacle (4).
(5) Make sure that all the electrical connections are clean and in the correct condition.
(6) Connect the electrical connector (5) to the electrical receptacle (4).
Subtask 24-61-55-865-052-A CAUTION:
MAKE SURE THAT THE CONTACTOR LOCATING PIN IS CORRECTLY ENGAGED IN ITS RECESS LOCATED IN ONE POWER TERMINAL.
THIS PREVENTS DAMAGE TO THE LOCATING PIN WHEN YOU APPLY THE TORQUE.
(1) Install the contactor (3) on the module (1). (2) TORQUE the two captive screws (2) to between 0.30 and 0.27 m.daN (26.55 and 23.89 lbf.in )
. (3) Remove the CAP-BLANKING from each electrical connector and receptacle.
(4) Remove the blanking caps from the electrical receptacle (4).
(5) Make sure that all the electrical connections are clean and in the correct condition.
(6) Connect the electrical connector (5) to the electrical receptacle (4).
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
Subtask 24-61-55-710-051-A ** ON A/C NOT FOR ALL | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 122VU | ELEC/DC SHED BUS/CNTR | 9PN | U26 |
| 124VU | SHED BUS 210PP/212PP/SPLY | 11PN | BA01 |
C. Test
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(2) On the overhead ELEC panel 35VU, push the GALY & CAB pushbutton switch (2XA) (the white indication light goes off).
(3) On the rear panel 120VU, make sure that there is 28VDC on busbar 210PP.
(4) On the panel 2000VU, make sure that there is 28VDC on busbar 212PP.
(5) On the overhead ELEC panel 35VU, release the GALY & CAB pushbutton switch (2XA) (the white indication light goes on).
Subtask 24-61-55-710-051-B ** ON A/C NOT FOR ALL (1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(2) On the overhead ELEC panel 35VU, push the GALY & CAB pushbutton switch (2XA) (the white indication light goes off).
(3) On the rear panel 120VU, make sure that there is 28VDC on busbar 210PP.
(4) On the panel 2000VU, make sure that there is 28VDC on busbar 212PP.
(5) On the overhead ELEC panel 35VU, release the GALY & CAB pushbutton switch (2XA) (the white indication light goes on).
C. Test
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(2) On the overhead ELEC panel 35VU, push the ELEC/COMMERCIAL pushbutton switch (22XN) (the white indication light goes off).
(3) On the overhead ELEC panel 35VU, push the GALY & CAB pushbutton switch (2XA) (the white indication light goes off).
(4) On the rear panel 120VU, make sure that there is 28VDC on busbar 210PP.
(5) On the panel 2000VU, make sure that there is 28VDC on busbar 212PP.
(6) On the overhead ELEC panel 35VU, release the GALY & CAB pushbutton switch (2XA) (the white indication light goes on).
(7) On the overhead ELEC panel 35VU, release the ELEC/COMMERCIAL pushbutton switch (22XN) (the white indication light goes on).
5. Close-up(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(2) On the overhead ELEC panel 35VU, push the ELEC/COMMERCIAL pushbutton switch (22XN) (the white indication light goes off).
(3) On the overhead ELEC panel 35VU, push the GALY & CAB pushbutton switch (2XA) (the white indication light goes off).
(4) On the rear panel 120VU, make sure that there is 28VDC on busbar 210PP.
(5) On the panel 2000VU, make sure that there is 28VDC on busbar 212PP.
(6) On the overhead ELEC panel 35VU, release the GALY & CAB pushbutton switch (2XA) (the white indication light goes on).
(7) On the overhead ELEC panel 35VU, release the ELEC/COMMERCIAL pushbutton switch (22XN) (the white indication light goes on).
Subtask 24-61-55-410-051-A
A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the front panel on the bottom right side of the panel 120VU.
(3) Install the third occupant seat (Ref. AMM TASK 25-11-41-400-001).
(4) Remove the WARNING NOTICE(S).
(5) Close the access door 121AL.
(6) Remove the access platform(s).
Subtask 24-61-55-862-051-A (1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the front panel on the bottom right side of the panel 120VU.
(3) Install the third occupant seat (Ref. AMM TASK 25-11-41-400-001).
(4) Remove the WARNING NOTICE(S).
(5) Close the access door 121AL.
(6) Remove the access platform(s).