W DOC AIRBUS | AMM A320F

Installation of the DC Service Bus Normal Supply Contactor

TASK 24-61-55-400-001-A
Installation of the DC Service 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.
ZONE: 125
FIN: 8PN
1. Reason for the Job
Self explanatory
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
AR
WARNING NOTICE(S)
No specific
Torque wrench: range to between 26.55 and 23.9 lbf.in (0.30 and 0.27 m.daN ) T
 B. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
125
LATERAL AVIONIC COMPARTMENT
121AL
 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 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
F Contactor ** ON A/C NOT FOR ALL
F Contactor ** ON A/C NOT FOR ALL
3. Job Set-up
Subtask 24-61-55-860-051-A
A. Aircraft Maintenance Configuration
   (1) Make sure that the access platform 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, there is a WARNING NOTICE(S) to tell persons not to connect the external power connector.
   (5) In the cockpit, on the overhead panel 35VU, make sure that these pushbutton switches are released:
  • BAT 1, BAT 2,
  • APU GEN,
  • GEN 1, GEN 2,
  • EXT PWR.
   (6) Make sure that there is a WARNING NOTICE(S) in the cockpit to tell persons not to operate the pushbutton switches on these overhead panels:
  • 21VU (EMER ELEC PWR),
  • 35VU (ELEC).
   (7) In the cockpit, on the APU section of the overhead panel 25VU, make sure that a WARNING NOTICE(S) is in position to tell persons not to start the APU.
   (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.
4. Procedure
Subtask 24-61-55-420-050-A ** ON A/C NOT FOR ALL
A. Installation of the Contactor
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) Put the contactor (3) in position on the tapped barrels (6) of the connecting base (5).
   (2) TORQUE the two captive screws (2) to between 26.55 and 23.9 lbf.in (0.30 and 0.27 m.daN ) T.
   (3) Remove the CAP-BLANKING from each electrical connector and receptacle.
   (4) Make sure that all the electrical connections are clean and in the correct condition.
   (5) Connect the connector (4) on the contactor (3).
Subtask 24-61-55-420-050-B ** ON A/C NOT FOR ALL
A. Installation of the Contactor
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) in position on the module 14PN (5).
   (2) TORQUE the captive screws (2) to between 26.55 and 23.9 lbf.in (0.30 and 0.27 m.daN ) T.
   (3) Remove the blanking caps from the electrical connector (4) and the electrical receptacle.
   (4) Make sure that all the electrical connections are clean and in the correct condition.
   (5) Connect the electrical connector (4) to the contactor (3).
Subtask 24-61-55-710-050-A
B. Test of the Dome Lights in the Cockpit
   (1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
   (2) On the overhead panel 25VU, put the INT LT/DOME switch in the BRT position. The dome lights on the panel 453VU, on the left of the cockpit, come on.
   (3) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).
5. Close-up
Subtask 24-61-55-410-050-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).
[Rev.10 from 2021] 2026.03.31 23:25:21 UTC
"Aviabrain" 2025