DOC AIRBUS | AMM A320FInstallation of the J12 Harness [CFMI]
TASK 73-21-50-400-011-A
Installation of the J12 Harness
1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Work Zones and Access Panels
D. Referenced Information
3. Job Set-up
Subtask 73-21-50-860-082-A ** ON A/C NOT FOR ALL
Subtask 73-21-50-420-058-A ** ON A/C NOT FOR ALL
Subtask 73-21-50-862-060-A ** ON A/C NOT FOR ALL Subtask 73-21-50-410-060-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 13:05:01 UTC
Installation of the J12 Harness
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 | PLIERS - JAWED, SOFT |
| No specific | AR | WARNING NOTICE(S) |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.CP2101) | graphite grease |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| FOR [1000EM1] (ENGINE-1) | |
| 437AL, 438AR, 451AL, 452AR | |
| FOR [1000EM2] (ENGINE-2) | |
| 447AL, 448AR, 461AL, 462AR | |
| 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 71-13-00-010-040-A | Opening of the Fan Cowl Doors |
| TASK 71-13-00-410-040-A | Closing of the Fan Cowl Doors |
| TASK 73-29-00-710-040-A-02 | Operational Test of the FADEC on the Ground (with Engine non Motoring) |
| TASK 78-30-00-081-041-A | Make the Thrust Reverser Serviceable after Maintenance |
| TASK 78-30-00-481-041-A | Make the Thrust Reverser Unserviceable for Maintenance |
| TASK 78-36-00-010-040-A | Opening of the Thrust Reverser Doors |
| TASK 78-36-00-410-040-A | Closing of the Thrust Reverser Doors |
J12 HarnessSubtask 73-21-50-860-082-A ** ON A/C NOT FOR ALL
A. Aircraft Maintenance Configuration
(1) On the center pedestal, on the ENG panel 115VU, make sure that a WARNING NOTICE(S) is in position to tell persons not to start the engine.
(2) On the overhead maintenance panel 50VU, make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off. Make sure that a WARNING NOTICE(S) is in position to tell persons not to energize the FADEC 1(2).
Subtask 73-21-50-010-087-A ** ON A/C NOT FOR ALL (1) On the center pedestal, on the ENG panel 115VU, make sure that a WARNING NOTICE(S) is in position to tell persons not to start the engine.
(2) On the overhead maintenance panel 50VU, make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off. Make sure that a WARNING NOTICE(S) is in position to tell persons not to energize the FADEC 1(2).
B. Get Access
(1) Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Make sure that the thrust reverser doors are open (Ref. AMM TASK 78-36-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR
Subtask 73-21-50-040-071-A ** ON A/C NOT FOR ALL 4. Procedure(1) Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Make sure that the thrust reverser doors are open (Ref. AMM TASK 78-36-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR
Subtask 73-21-50-420-058-A ** ON A/C NOT FOR ALL
A. Installation of the J12 Harness
(1) Apply a thin layer of graphite grease (Material No.CP2101) on the bolt threads before installation.
(2) Install the J12 electrical harness on the fan frame and the 6 o'clock strut. Remove the cap from the connectors.
(3) Connect the electrical connectors:
1 Engage the connector in the related receptacle, and turn the knurled coupling ring by hand until full engagement.
2 Tighten the coupling ring with PLIERS - JAWED, SOFT.
3 Make sure that the connector is fully engaged and does not move.
4 If necessary, do the above steps again.
PRE SB 72-169
(4) Remove the clamp assembly from between the brackets which are at the 5 o'clock location of flanges G and E (detail A). Install the J12 harness into the flexible clamp (81). Install the cover plate (85) and attach with 2 bolts (82) and nuts (84). Tighten bolts by hand.
POST SB 72-169
(5) Remove the clamp assembly from between the brackets which are at the 5 o'clock location on flanges G and E (detail A). Install the J12 harness into the flexible clamp (81). Install the cover plate (85) and attach with 2 bolts (82). Install the J15 harness in clamp (83) and attach with nuts (84). Tighten bolts by hand.
END OF SB 72-169
(6) Remove the clamp assembly from the right leg of the bracket which is at the 5:30 o'clock location between flanges E and G (detail B). Install the J12 harness into the flexible clamp (128). Install the cover plate (127) and attach with 2 bolts (129). Tighten bolts by hand.
PRE SB 72-232
(7) Install the J12 harness into the flexible clamp (130) on the right bracket of the Transfer Gearbox (TGB) (detail C). Install the cover plate (133) and attach with 2 bolts (132). Tighten bolts by hand.
POST SB 72-232
(8) Install the J12 harness into the flexible clamp (130) on the right bracket of the Transfer Gearbox (TGB) (detail C). Install the cover plate (133) and attach with 2 bolts (132) and washers (131). Tighten bolts by hand.
PRE SB 72-232
(9) Install the 2 leads of the J12 harness into the flexible clamp (203) on the rear right bracket of the TGB (detail D). Install the cover plate (204) and attach with 2 bolts (201). Tighten bolts by hand.
POST SB 72-232
(10) Install the 2 leads of the J12 harness into the flexible clamp (203) on the rear right bracket of the TGB (detail D). Install the cover plate (204) and attach with 2 bolts (201) and washers (202). Tighten bolts by hand.
PRE SB 72-200
(11) Remove the flexible clamp assembly (208) from the rear bracket of the TGB (detail E). Install the 2 leads of the J12 harness into the flexible clamp and install clamp assembly. Position the cover plate (207) and attach with the bolt (206). Position the J13 bracket on the cover plate (207) and attach with the bolt (205). Tighten the bolts by hand.
POST SB 72-200
(12) Open the flexible clamp (210) on the rear bracket of the TGB (detail E) and install the 2 leads of the J12 harness. Position the cover plate (209) over the flexible clamp (210) and attach with bolt (206). Position the J13 bracket on the cover plate (209) and attach with the bolt (205). Tighten the bolts by hand.
END OF SB 72-200
(13) Install the 2 leads of the J12 harness into the 3 clips attached to the 6 o'clock strut.
Subtask 73-21-50-942-078-A ** ON A/C NOT FOR ALL (1) Apply a thin layer of graphite grease (Material No.CP2101) on the bolt threads before installation.
(2) Install the J12 electrical harness on the fan frame and the 6 o'clock strut. Remove the cap from the connectors.
(3) Connect the electrical connectors:
CAUTION:
CAREFULLY ALIGN THE CONNECTOR KEY WITH THE RECEPTACLE KEYWAY BEFORE YOU CONNECT THEM TO PREVENT DAMAGE TO THE CONNECTORS.
CAUTION:
DISTRIBUTE THE SLACK ALL ALONG THE CABLE. DO NOT LET THE CABLE SHEATH TOUCH THE ADJACENT COMPONENTS. DO NOT TWIST THE SHEATH BY MORE THAN 180 DEGREES.
(a) Connect the J12 electrical harness to the Electronic Control Unit (ECU) and the 6 o'clock junction box as follows: 1 Engage the connector in the related receptacle, and turn the knurled coupling ring by hand until full engagement.
2 Tighten the coupling ring with PLIERS - JAWED, SOFT.
3 Make sure that the connector is fully engaged and does not move.
4 If necessary, do the above steps again.
PRE SB 72-169
(4) Remove the clamp assembly from between the brackets which are at the 5 o'clock location of flanges G and E (detail A). Install the J12 harness into the flexible clamp (81). Install the cover plate (85) and attach with 2 bolts (82) and nuts (84). Tighten bolts by hand.
POST SB 72-169
(5) Remove the clamp assembly from between the brackets which are at the 5 o'clock location on flanges G and E (detail A). Install the J12 harness into the flexible clamp (81). Install the cover plate (85) and attach with 2 bolts (82). Install the J15 harness in clamp (83) and attach with nuts (84). Tighten bolts by hand.
END OF SB 72-169
(6) Remove the clamp assembly from the right leg of the bracket which is at the 5:30 o'clock location between flanges E and G (detail B). Install the J12 harness into the flexible clamp (128). Install the cover plate (127) and attach with 2 bolts (129). Tighten bolts by hand.
PRE SB 72-232
(7) Install the J12 harness into the flexible clamp (130) on the right bracket of the Transfer Gearbox (TGB) (detail C). Install the cover plate (133) and attach with 2 bolts (132). Tighten bolts by hand.
POST SB 72-232
(8) Install the J12 harness into the flexible clamp (130) on the right bracket of the Transfer Gearbox (TGB) (detail C). Install the cover plate (133) and attach with 2 bolts (132) and washers (131). Tighten bolts by hand.
PRE SB 72-232
(9) Install the 2 leads of the J12 harness into the flexible clamp (203) on the rear right bracket of the TGB (detail D). Install the cover plate (204) and attach with 2 bolts (201). Tighten bolts by hand.
POST SB 72-232
(10) Install the 2 leads of the J12 harness into the flexible clamp (203) on the rear right bracket of the TGB (detail D). Install the cover plate (204) and attach with 2 bolts (201) and washers (202). Tighten bolts by hand.
PRE SB 72-200
(11) Remove the flexible clamp assembly (208) from the rear bracket of the TGB (detail E). Install the 2 leads of the J12 harness into the flexible clamp and install clamp assembly. Position the cover plate (207) and attach with the bolt (206). Position the J13 bracket on the cover plate (207) and attach with the bolt (205). Tighten the bolts by hand.
POST SB 72-200
(12) Open the flexible clamp (210) on the rear bracket of the TGB (detail E) and install the 2 leads of the J12 harness. Position the cover plate (209) over the flexible clamp (210) and attach with bolt (206). Position the J13 bracket on the cover plate (209) and attach with the bolt (205). Tighten the bolts by hand.
END OF SB 72-200
(13) Install the 2 leads of the J12 harness into the 3 clips attached to the 6 o'clock strut.
B. Remove the WARNING NOTICE(S).
Subtask 73-21-50-861-060-A ** ON A/C NOT FOR ALL Subtask 73-21-50-710-060-A ** ON A/C NOT FOR ALL 5. Close-upSubtask 73-21-50-862-060-A ** ON A/C NOT FOR ALL Subtask 73-21-50-410-060-A ** ON A/C NOT FOR ALL
B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the thrust reverser doors (Ref. AMM TASK 78-36-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR
Subtask 73-21-50-440-060-A ** ON A/C NOT FOR ALL Subtask 73-21-50-410-076-A ** ON A/C NOT FOR ALL (1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the thrust reverser doors (Ref. AMM TASK 78-36-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR