Loss of the RAC Torque Motor Control through the two Channels on Engine 1

TASK 73-29-00-810-912-A
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
TSM TASK 73-29-00-810-880-A	Loss of the RAC Torque Motor Control through the Channel A on Engine 1
TSM TASK 73-29-00-810-881-A	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
Subtask 73-29-00-710-224-A ** ON A/C NOT FOR ALL

A. Test
(1) Do the operational test of the FADEC 1A and 1B on the ground (with engine motoring) AMM 73-29-00-710-040.

4. Fault Isolation
Subtask 73-29-00-810-204-A ** ON A/C NOT FOR ALL

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. TSM TASK 73-29-00-810-880) and (Ref. TSM TASK 73-29-00-810-881).

[Rev.8 from Aug 2018] 2026.04.04 04:36:02 UTC