- replace the ECU (4000KS), (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
 (b) If the resistance values are out of the specified limits:
 - disconnect the harness J8 from the HMU and do a check of the HMU receptacle resistance between: . pins 6 and 7 (26 to 36 Ohms) . pins 6 and 39 (> 10 Megohms) . pin 6 and the ground (> 10 Megohms).
 1 If the resistance values are in the specified limits:
_
 - replace the harness J8, (Ref. AMM TASK 73-21-50-000-041) and (Ref. AMM TASK 73-21-50-400-041).
 2 If the resistance values are out of the specified limits:
_
 - replace the Hydromechanical Unit (HMU), (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002).
 B. Do the test given in Para. 3.A.(1).
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 1. Possible Causes
 Loss of the RAC Torque Motor Control through the Channel A on Engine 1 _______________
 2. Job Set-up Information______________________ Not Applicable
 3. Fault Confirmation__________________
 4. Fault Isolation_______________
 A. Do the test given in Para. 3.A.(1).
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 Loss of the RAC Torque Motor Control through the Channel B on Engine 1
 1. Possible Causes

_______________

 2. Job Set-up Information

______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM  73-29-00-710-040 Operational Test of the FADEC on the ground (with Engine Motoring)
 3. Fault Confirmation
__________________
 A. Test
 (1) Do the operational test of the FADEC 1B on the ground (with engine motoring) (Ref. AMM TASK 73-29-00-710-040).
 NOTE : If post SB 75-029, fault message must be ignored: no trouble
____
 shooting is necessary.

 4. Fault Isolation
_______________
 A. Do the test given in Para. 3.A.(1).
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 Loss of the RAC Torque Motor Control through the Channel A on Engine 2
 1. Possible Causes

_______________

 2. Job Set-up Information

______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM  73-29-00-710-040 Operational Test of the FADEC on the ground (with Engine Motoring)
 3. Fault Confirmation
__________________
 A. Test
 (1) Do the operational test of the FADEC 2A on the ground (with engine motoring) (Ref. AMM TASK 73-29-00-710-040).
 NOTE : If post SB 75-029, fault message must be ignored: no trouble
____
 shooting is necessary.

 4. Fault Isolation
_______________
 A. Do the test given in Para. 3.A.(1).
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 Loss of the RAC Torque Motor Control through the Channel B on Engine 2
 1. Possible Causes

_______________

 2. Job Set-up Information

______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM  73-29-00-710-040 Operational Test of the FADEC on the ground (with Engine Motoring)
 3. Fault Confirmation
　
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