- If either message is present, do the related troubleshooting procedure.

 (2) If no message is present and engine parameters fluctuations were

 reported at the same time: R - do the applicable troubleshooting procedure for ENG1 N1 R fluctuations.
R B. Do the operational test of the FADEC on the ground (with engine non R motoring) (Ref. AMM TASK 73-29-00-710-040).
R (1) If the test gives the message N2 SNSR, J7, ECU or N2 SNSR, J8, ECU, R do the applicable troubleshooting procedure.
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 TASK 77-00-00-810-832

 Disagree between the N2 Indication and the ECU Output on Engine 2
 1. Possible Causes
_______________

 - SENSOR-N2 ROTATIONAL SPD (4001EV)

 - J7/J8 harness

 - ECU

 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 non Motoring)
 3. Fault Confirmation
__________________
 A. Test
 (1) Not applicable.
 4. Fault Isolation
_______________

 A. The fault may be triggered with wide N2 fluctuations or due to defective SENSOR-N2 ROTATIONAL SPD (4001EV) or J7/J8 harness.
 (1) Read the scheduled maintenance report or class 3 report and check if the message N2 SNSR, J7, ECU or N2 SNSR, J8, ECU is present.

 - If either message is present, do the related troubleshooting procedure.

 (2) If no message is present and engine parameters fluctuations were reported at the same time:

 - do the applicable troubleshooting procedure for ENG2 N1 fluctuations.
R B. Do the operational test of the FADEC on the ground (with engine non R motoring) (Ref. AMM TASK 73-29-00-710-040).
R (1) If the test gives the message N2 SNSR, J7, ECU or N2 SNSR, J8, ECU, R do the applicable troubleshooting procedure.
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 TASK 77-00-00-810-833

 N1 Actual Lower than N1 Command on Engine 1 or 2
 1. Possible Causes
_______________

 - DMC-1 (1WT1) R - PS3 line
 - Hydromechanical Unit (HMU)
 2. Job Set-up Information
______________________
 A. Referenced Information

 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 31-63-34-000-001 Removal of the DMC (1WT1,1WT2,1WT3)
 AMM 31-63-34-400-001 Installation of the DMC (1WT1,1WT2,1WT3)

R  AMM 72-00-00-200-026 Inspection/Check of the PS3 Line AMM 73-21-10-000-002 Removal of the Hydromechanical Unit (HMU) AMM 73-21-10-400-002 Installation of the Hydromechanical Unit (HMU)
 3. Fault Confirmation
__________________
 A. Test

 (1) Make sure that the same crew observation is applicable with the DMC3 switched on on panel 8VU.
 4. Fault Isolation
_______________

 A. If the same crew observation is not applicable when the DMC3 is switched on:
 (1) Replace the DMC-1 (1WT1) (Ref. AMM TASK 31-63-34-000-001) and (Ref. AMM TASK 31-63-34-400-001).
 B. If the same crew observation is applicable when the DMC3 is switched on:
R (1) Do a check of the PS3 line (Ref. AMM TASK 72-00-00-200-026).
R - If damage is found, replace or retighten as required.

R (2) If no damage is found:
R
R - Replace the Hydromechanical Unit (HMU) (Ref. AMM TASK 73-21-10-000-R 002) and (Ref. AMM TASK 73-21-10-400-002).

 C. After the subsequent flight, make sure that the fault does not continue.
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