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 Loss of the VBV Torque Motor Control through the Channel B on Engine 1 and Channel B on Engine 2
 1. Possible Causes

_______________

 2. Job Set-up Information

______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
73-29-00-810-889 Loss of the VBV Torque Motor Control - Engine 1 -Channel B 73-29-00-810-891 Loss of the VBV Torque Motor Control - Engine 2 -Channel B AMM 73-29-00-710-040 Operational Test of the FADEC on the ground (with Engine Motoring)
 3. Fault Confirmation
__________________
 A. Do the operational test of the FADEC 1B and 2B on the ground (with engine motoring) (Ref. AMM TASK 73-29-00-710-040).
 4. Fault Isolation
_______________
 A. If the test gives the maintenance messages:
 - J8, HMU (VBV TM), ECU on the channel 1B
 and

 - J8, HMU (VBV TM), ECU on the channel 2B

 (1) Do the trouble shooting procedure (Ref. TASK 73-29-00-810-889).

 (2) Do the trouble shooting procedure (Ref. TASK 73-29-00-810-891).

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 TASK 73-29-00-810-912
 Loss of the RAC Torque Motor Control through the two Channels on Engine 1
 1. Possible Causes

_______________

 2. Job Set-up Information

______________________
 A. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
73-29-00-810-880 Loss of the RAC Torque Motor Control through the
 Channel A on Engine 1
 73-29-00-810-881 Loss of the RAC Torque Motor Control through the

 Channel B on Engine 1 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 1A and 1B on the ground (with engine motoring) (Ref. AMM TASK 73-29-00-710-040).
 4. Fault Isolation
_______________
 A. If the test gives the maintenance messages J7, HMU (RAC TM), ECU and J8, HMU (RAC TM), ECU:
 - do the following troubleshooting procedures (Ref. TASK 73-29-00-810-880) and (Ref. TASK 73-29-00-810-881).
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E TASK 73-29-00-810-913

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 Loss of the RAC Torque Motor Control through the two Channels on Engine 2
 1. Possible Causes

_______________

 2. Job Set-up Information

______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
73-29-00-810-882 Loss of the RAC Torque Motor Control through the
 Channel A on Engine 2
 73-29-00-810-883 Loss of the RAC Torque Motor Control through the

 Channel B on Engine 2 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 and 2B on the ground (with engine motoring) (Ref. AMM TASK 73-29-00-710-040).
 4. Fault Isolation
_______________
 A. If the test gives the maintenance messages J7, HMU (RAC TM), ECU and J8, HMU (RAC TM), ECU:
 - do the following troubleshooting procedures (Ref. TASK 73-29-00-810-882) and (Ref. TASK 73-29-00-810-883).
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