W DOC AIRBUS | AMM A320F

Modification of the JH1 and JH2 Routing to Return to Normal Configuration [CFMB]

TASK 74-31-00-440-802-A
Modification of the JH1 and JH2 Routing to Return to Normal Configuration

FIN: 1000EM1 ** ON A/C NOT FOR ALL
FIN: 1000EM2 ** ON A/C NOT FOR ALL
1. Reason for the Job
MMEL 74-31-01A
IGNITION SYSTEM A (FAA ONLY)
left ignition lead on aircraft battery bus.
MMEL743101
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
AR
ACCESS PLATFORM 5M (16 FT)- ADJUSTABLE
No specific
AR
PLIERS - NOSE, SOFT, LONG
No specific
AR
SAFETY CLIP - CIRCUIT BREAKER
No specific
AR
WARNING NOTICE(S)
 B. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR
 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 71-13-00-010-040-B
Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-B
Closing of the Fan Cowl Doors
TASK 74-00-00-710-043-A
Operational Test of the Ignition System
TASK 74-00-00-710-043-A-01
Operational Test of the Ignition System without CFDS
TASK 78-30-00-081-041-B
Make the Thrust Reverser Serviceable after Maintenance
TASK 78-30-00-481-041-B
Make the Thrust Reverser Unserviceable for Maintenance
F Temporary Modification of the JH1 and JH2 Harnesses Routing and Connection
3. Job Set-up
Subtask 74-31-00-861-053-A ** ON A/C NOT FOR ALL
A. Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
Subtask 74-31-00-941-055-A ** ON A/C NOT FOR ALL
B. Safety Precautions
   (1) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
   (2) On the center pedestal, on the ENG panel 115VU:
     (a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
   (3) On the overhead maintenance panel 50VU:
     (a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
     (b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).
Subtask 74-31-00-865-061-A ** ON A/C NOT FOR ALL
C. Open, safety and tag this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
49VUENGINE/1 AND 2/IGN/SYS A1JHA03
FOR FIN: 1000EM1 (ENGINE1)
121VUENGINE/IGN/ENG1/SYS B3JH1P41
121VUENGINE/IGN/ENG1/SYS A BAT2JH1P39
FOR FIN: 1000EM2 (ENGINE2)
121VUENGINE/IGN/ENG2/SYS B3JH2P42
121VUENGINE/IGN/ENG2/SYS A BAT2JH2P40
Subtask 74-31-00-010-053-A ** ON A/C NOT FOR ALL
D. Get Access
   (1) Open the fan cowl doors: (Ref. AMM TASK 71-13-00-010-040)
     (a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
     (b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
   (2) Put an ACCESS PLATFORM 5M (16 FT)- ADJUSTABLE in position.
Subtask 74-31-00-040-052-A ** ON A/C NOT FOR ALL
E. Make the thrust reverser unserviceable (Ref. AMM TASK 78-30-00-481-041).
4. Procedure
Subtask 74-31-00-020-052-A ** ON A/C NOT FOR ALL
A. Put the 4000JH1 and 4000JH2 wiring harness routings and connections to the normal configuration as follows:
   (1) Disconnect the 4000JH1 harness connector from the lower ignition exciter-B.
   (2) Disconnect the 4000JH2 harness connector from the upper ignition exciter-A.
   (3) Make sure that the electrical connections are clean and in the correct condition.
   (4) Route the 4000JH2 as follows:
     (a) Connect the 4000JH2 harness connector to the lower ignition exciter-B by hand. Use PLIERS - NOSE, SOFT, LONG only if necessary.
   (5) Route the 4000JH1 harness as follows:
     (a) Connect the 4000JH1 harness connector to the upper ignition exciter-A by hand. Use PLIERS - NOSE, SOFT, LONG only if necessary.
   (6) Make sure that no contact of the harnesses with the ignition exciter can occur.
Subtask 74-31-00-865-062-A ** ON A/C NOT FOR ALL
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
49VUENGINE/1 AND 2/IGN/SYS A1JHA03
FOR FIN: 1000EM1 (ENGINE1)
121VUENGINE/IGN/ENG1/SYS B3JH1P41
121VUENGINE/IGN/ENG1/SYS A BAT2JH1P39
FOR FIN: 1000EM2 (ENGINE2)
121VUENGINE/IGN/ENG2/SYS B3JH2P42
121VUENGINE/IGN/ENG2/SYS A BAT2JH2P40
Subtask 74-31-00-710-055-A ** ON A/C NOT FOR ALL
C. Do an operational test of the ignition system (Ref. AMM TASK 74-00-00-710-043).
5. Close-up
Subtask 74-31-00-440-055-A ** ON A/C NOT FOR ALL
A. Make the thrust reverser serviceable (Ref. AMM TASK 78-30-00-081-041).
Subtask 74-31-00-410-053-A ** ON A/C NOT FOR ALL
B. Close Access
   (1) Close the fan cowl doors: (Ref. AMM TASK 71-13-00-410-040)
     (a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
     (b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
   (2) Remove the access platform(s).
   (3) Remove the WARNING NOTICE(S).
Subtask 74-31-00-862-053-A ** ON A/C NOT FOR ALL
C. De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).
[Rev.10 from 2021] 2026.04.02 06:36:47 UTC
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