DOC AIRBUS | AMM A320FInstallation of the J8 Harness [CFMI]
TASK 73-21-50-400-007-A
Installation of the J8 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 73-21-50-860-078-A ** ON A/C NOT FOR ALL
Subtask 73-21-50-420-061-A ** ON A/C NOT FOR ALL
Subtask 73-21-50-862-056-A ** ON A/C NOT FOR ALL Subtask 73-21-50-410-056-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 13:04:58 UTC
Installation of the J8 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) |
| No specific | Torque wrench: range to between 50 and 45 lbf.in (0.57 and 0.51 m.daN )  |
| 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 |
J8 HarnessSubtask 73-21-50-860-078-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 73-21-50-010-079-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):
(2) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(3) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(4) Make sure that the thrust reverser doors are open (Ref. AMM TASK 78-36-00-010-040):
(5) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(6) FOR [1000EM2] (ENGINE-2)
461AL 462AR
Subtask 73-21-50-040-063-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):
(2) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(3) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(4) Make sure that the thrust reverser doors are open (Ref. AMM TASK 78-36-00-010-040):
(5) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(6) FOR [1000EM2] (ENGINE-2)
461AL 462AR
Subtask 73-21-50-420-061-A ** ON A/C NOT FOR ALL
A. Installation of the J8 Harness
(1) Apply a thin layer of graphite grease (Material No.CP2101) to the bolt threads before installation.
(2) Set the J8 electrical harness in position on the fan frame and remove the caps from the connectors.
PRE SB CFM 72-519
(a) Connect the J8 electrical harness to the Electronic Control Unit (ECU), the ECU cooling valve, the N2 speed sensor, the Hydromechanical Unit (HMU) and the fuel return valve as follows:
POST SB CFM 72-519
(b) Connect the J8 electrical harness to the Electronic Control Unit (ECU), the N2 speed sensor, the Hydromechanical Unit (HMU) and the fuel return valve as follows:
END OF SB CFM 72-519
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) Install the J8 harness in the the flexible clamp (81). Position the clamp between the brackets at the 5 o'clock location on flanges G and E (detail A). Attach the cover plate (85) with 2 bolts (82) and nuts (84). Tighten bolts by hand.
POST SB 72-169
(5) Install the J8 harness in the flexible clamp (81). Position the clamp between the brackets at the 5 o'clock location on flange G and E (detail A). Attach the cover plate (85) with 2 bolts (82), J15 harness clamp (83), and nuts (84). Tighten bolts by hand.
END OF SB 72-169
(6) Attach the J8 harness to the bracket at the 5:30 o'clock location between flanges G and E (detail D) with bolts (91). Tighten bolts by hand.
(a) Install the clamp (93) and the bolt (92) which attach the J7 harness with the J8 harness to the left leg of the same bracket (detail E). Tighten the bolt by hand.
(b) Attach the J7 and J8 harnesses together with the clip, and attach the assembly in the clip on the bracket attached to flange G on the left side of the 6 o'clock location (detail F).
(7) Install the loop clamp (120) and the bolt (121) which attach the J7 harness to the left AGB bracket (detail G). Tighten the bolt by hand.
(8) Install the loop clamp (120) and the bolt (122) which attach the J8 harness to the front left bracket on the AGB/TGB interface (detail H). Tighten the bolt by hand.
(9) Attach the J7 and J8 harnesses together with the J7 harness clip. Attach the assembly to the brackets at the 6:30 o'clock, 7 o'clock and 7:30 o'clock locations with the clips on flange E (details I, J and K).
(10) Install the loop clamp (124) and the bolt (111) which attach the J7 harness with the J8 harness to the bracket at the 8 o'clock location on flange D (detail L).
PRE SB 72-169
PRE SB CFM 72-519
(11) Install the loop clamp (115) and the bolt (95) which attach the J7 harness with the J8 harness to the bracket at the 5:30 o'clock location on flange G (detail M).
POST SB 72-169
(12) Install the loop clamp (115) and the bolt (95) and the nut (96) which attach the J7 harness with the J8 harness to the bracket at the 5.30 o'clock location on flange G (detail M) with the bleed bias tubes.
END OF SB 72-169
(13) Install the clamps (112) the bolt (87) and the nut (88) which attach the J7 harness with the J8 harness to the bracket at the 5 o'clock location on flanges G and E (detail B). Tighten the bolt by hand.
(14) Install the clamp (113) and the bolt (90) which attach the J7 harness with the J8 harness to the same bracket as above (detail C). Tighten the bolt by hand.
(15) Attach the J8 harness to the clip on the bracket at the 4:30 o'clock location on flange E (detail N) under the ECU.
PRE SB 72-169
(16) Install the loop clamp (116) and the bolt (98) which attach the J7 harness with the J8 harness to the bracket at the 4 o'clock location on flange E (detail O). Tighten the bolt by hand.
POST SB 72-169
(17) Install the loop clamp (116) and the bolt (117) which attach the J8 harness to the bracket at the 4 o'clock location on flange E (detail O). Tighten the bolt by hand.
END OF SB 72-169
(18) Install the loop clamp (118) and the bolt (101) which attach the J7 harness with the J8 harness to the same bracket at the 3:30 o'clock location (detail P).
(19) Install the loop clamp (119) and the bolt (102) which attach the J7 harness with the J8 harness to the bracket on the right side of the 3 o'clock location on flange E (detail Q). Tighten the bolt by hand.
POST SB CFM 72-519
(20) Not Applicable
END OF SB CFM 72-519
(21) Make sure that the J8 harness is not stressed. TORQUE all bolts to between 50 and 45 lbf.in (0.57 and 0.51 m.daN ).
Subtask 73-21-50-942-074-A ** ON A/C NOT FOR ALL (1) Apply a thin layer of graphite grease (Material No.CP2101) to the bolt threads before installation.
(2) Set the J8 electrical harness in position on the fan frame and remove the caps from the 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.
(3) Connect the electrical connectors: PRE SB CFM 72-519
(a) Connect the J8 electrical harness to the Electronic Control Unit (ECU), the ECU cooling valve, the N2 speed sensor, the Hydromechanical Unit (HMU) and the fuel return valve as follows:
POST SB CFM 72-519
(b) Connect the J8 electrical harness to the Electronic Control Unit (ECU), the N2 speed sensor, the Hydromechanical Unit (HMU) and the fuel return valve as follows:
END OF SB CFM 72-519
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) Install the J8 harness in the the flexible clamp (81). Position the clamp between the brackets at the 5 o'clock location on flanges G and E (detail A). Attach the cover plate (85) with 2 bolts (82) and nuts (84). Tighten bolts by hand.
POST SB 72-169
(5) Install the J8 harness in the flexible clamp (81). Position the clamp between the brackets at the 5 o'clock location on flange G and E (detail A). Attach the cover plate (85) with 2 bolts (82), J15 harness clamp (83), and nuts (84). Tighten bolts by hand.
END OF SB 72-169
(6) Attach the J8 harness to the bracket at the 5:30 o'clock location between flanges G and E (detail D) with bolts (91). Tighten bolts by hand.
(a) Install the clamp (93) and the bolt (92) which attach the J7 harness with the J8 harness to the left leg of the same bracket (detail E). Tighten the bolt by hand.
(b) Attach the J7 and J8 harnesses together with the clip, and attach the assembly in the clip on the bracket attached to flange G on the left side of the 6 o'clock location (detail F).
(7) Install the loop clamp (120) and the bolt (121) which attach the J7 harness to the left AGB bracket (detail G). Tighten the bolt by hand.
(8) Install the loop clamp (120) and the bolt (122) which attach the J8 harness to the front left bracket on the AGB/TGB interface (detail H). Tighten the bolt by hand.
(9) Attach the J7 and J8 harnesses together with the J7 harness clip. Attach the assembly to the brackets at the 6:30 o'clock, 7 o'clock and 7:30 o'clock locations with the clips on flange E (details I, J and K).
(10) Install the loop clamp (124) and the bolt (111) which attach the J7 harness with the J8 harness to the bracket at the 8 o'clock location on flange D (detail L).
PRE SB 72-169
PRE SB CFM 72-519
(11) Install the loop clamp (115) and the bolt (95) which attach the J7 harness with the J8 harness to the bracket at the 5:30 o'clock location on flange G (detail M).
POST SB 72-169
(12) Install the loop clamp (115) and the bolt (95) and the nut (96) which attach the J7 harness with the J8 harness to the bracket at the 5.30 o'clock location on flange G (detail M) with the bleed bias tubes.
END OF SB 72-169
(13) Install the clamps (112) the bolt (87) and the nut (88) which attach the J7 harness with the J8 harness to the bracket at the 5 o'clock location on flanges G and E (detail B). Tighten the bolt by hand.
(14) Install the clamp (113) and the bolt (90) which attach the J7 harness with the J8 harness to the same bracket as above (detail C). Tighten the bolt by hand.
(15) Attach the J8 harness to the clip on the bracket at the 4:30 o'clock location on flange E (detail N) under the ECU.
PRE SB 72-169
(16) Install the loop clamp (116) and the bolt (98) which attach the J7 harness with the J8 harness to the bracket at the 4 o'clock location on flange E (detail O). Tighten the bolt by hand.
POST SB 72-169
(17) Install the loop clamp (116) and the bolt (117) which attach the J8 harness to the bracket at the 4 o'clock location on flange E (detail O). Tighten the bolt by hand.
END OF SB 72-169
(18) Install the loop clamp (118) and the bolt (101) which attach the J7 harness with the J8 harness to the same bracket at the 3:30 o'clock location (detail P).
(19) Install the loop clamp (119) and the bolt (102) which attach the J7 harness with the J8 harness to the bracket on the right side of the 3 o'clock location on flange E (detail Q). Tighten the bolt by hand.
POST SB CFM 72-519
(20) Not Applicable
END OF SB CFM 72-519
(21) Make sure that the J8 harness is not stressed. TORQUE all bolts to between 50 and 45 lbf.in (0.57 and 0.51 m.daN )
. B. Remove the WARNING NOTICE(S).
Subtask 73-21-50-861-056-A ** ON A/C NOT FOR ALL Subtask 73-21-50-710-056-A ** ON A/C NOT FOR ALL 5. Close-upSubtask 73-21-50-862-056-A ** ON A/C NOT FOR ALL Subtask 73-21-50-410-056-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 73-21-50-440-056-A ** ON A/C NOT FOR ALL Subtask 73-21-50-410-072-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