A. If the test gives the maintenance message:
 CONTACTOR 5KA:
 with the LRU TROUBLE SHOOT DATA menu information

 Fault Code Number: 124
 - replace the CONTACTOR-MAIN START (5KA) (Ref. AMM TASK 49-42-55-000-001) and (Ref. AMM TASK 49-42-55-400-001).
 (1) If the fault continues after the first flight on the subsequent day:
 - replace the ECB (59KD) (Ref. AMM TASK 49-61-34-000-001) and (Ref. AMM TASK 49-61-34-400-001).
R **ON A/C 001-003, 051-099, 401-499,
 B. Do the operational test of the APU (Ref. AMM TASK 49-00-00-710-004). NOTE : Make an entry in the applicable logbook that you must read the APU
____ CLASS 3 FAULTS after the first flight on the subsequent day.

 TASK 49-40-00-810-802
 Back-Up Start-Contactor Fault (GTCP 36-300)

 1. Possible Causes
_______________
 - CONTACTOR-BACK-UP START (10KA)

 - ECB (59KD)

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
AMM 49-00-00-710-004 Operational Test of the APU (4005KM) (GTCP 36-300)
 AMM 49-42-55-000-001 Removal of the Start Contactors (5KA,10KA)
 AMM 49-42-55-400-001 Installation of the Start Contactors (5KA,10KA)
 AMM 49-61-34-000-001 Removal of the Electronic Control Box (ECB) (59KD)

 (GTCP 36-300) AMM 49-61-34-400-001 Installation of the Electronic Control Box (ECB) (59KD) (GTCP 36-300)
 3. Fault Confirmation
__________________
 A. Do the operational test of the APU (Ref. AMM TASK 49-00-00-710-004).
 4. Fault Isolation
_______________ **ON A/C 001-003, 051-062,
 A. If the test gives the maintenance message:
 CONTACTOR 10KA:

 - replace the CONTACTOR-BACK-UP START (10KA) (Ref. AMM TASK 49-42-55-000-001) and (Ref. AMM TASK 49-42-55-400-001).
 (1) If the fault continues after the first flight on the subsequent day:
 - replace the ECB (59KD) (Ref. AMM TASK 49-61-34-000-001) and (Ref. AMM TASK 49-61-34-400-001).

R **ON A/C 063-099, 401-499,
 A. If the test gives the maintenance message:
 CONTACTOR 10KA:
 with the LRU TROUBLE SHOOT DATA menu information:

 Fault Code Number: 121
 - replace the CONTACTOR-BACK-UP START (10KA) (Ref. AMM TASK 49-42-55-000-001) and (Ref. AMM TASK 49-42-55-400-001).
 (1) If the fault continues after the first flight on the subsequent day:
 - replace the ECB (59KD) (Ref. AMM TASK 49-61-34-000-001) and (Ref. AMM TASK 49-61-34-400-001).
R **ON A/C 001-003, 051-099, 401-499,
 B. Do the operational test of the APU (Ref. AMM TASK 49-00-00-710-004). NOTE : Make an entry in the applicable logbook that you must read the APU
____ CLASS 3 FAULTS after the first flight on the subsequent day.

 IGNITION AND STARTING ((131-9(A))) - FAULT ISOLATION PROCEDURES
_______________________________________________________________
 TASK 49-40-00-810-807
 Contactor (5KA) Fault (131-9(A))

 1. Possible Causes
_______________
 - MAIN START CONTACTOR SHOWS CLOSED

 - CONTACTOR-MAIN START (5KA)

 - ECB (59KD)

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 49-00-00-710-010 Operational Test of the APU (131-9(A))
 AMM 49-42-55-000-001 Removal of the Start Contactors (5KA,10KA)
 AMM 49-42-55-400-001 Installation of the Start Contactors (5KA,10KA)
 AMM 49-61-34-000-003 Removal of the Electronic Control Box (ECB)

 (131-9(A)) AMM 49-61-34-400-003 Installation of the Electronic Control Box (ECB) (131-9(A))
 3. Fault Confirmation
__________________
 A. Read-out of the ECB Trouble Shooting Data
 (1) Get access to the APU LAST LEG/PREVIOUS LEG report.

 (2) Push the '>' adjacent to the related CFDS failure message:

 - the MCDU menu shows:
 MAIN START CONTACTOR SHOWS CLOSED

 (3) Put the APU MASTER SW to the ON position.

 (4) Get access to the APU GND SCANNING menu.

 4. Fault Isolation
_______________
 A. If the APU GND SCANNING menu gives the maintenance message:
 CONTACTOR (5KA)
 associated with Fault Code Number (FCN) 124
　
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