- replace the engine identification plug.

 (b) If the rating is correct:

 - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
 B. After the subsequent flight, make sure that the fault does not continue.
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 N1 Mismatch at Climb on Engine 1 or 2
 1. Possible Causes
_______________
 - PS12 line

 - engine identification plug

 - ECU (4000KS)

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 73-21-60-000-001 Removal of the Electronic Control Unit (ECU)(4000KS) AMM 73-21-60-400-001 Installation of the Electronic Control Unit (ECU)(4000KS)
 3. Fault Confirmation
__________________
 A. Test
 (1) Not applicable, the fault is evident.
 4. Fault Isolation
_______________
 A. If the fault symptom is identified by the crew observation: N1 mismatch at climb:
 (1) Do the trouble shooting procedure on the engine with the highest N1 actual.

 (2) On this engine do a check of the PS12 line for dents, cracks or wear. If you find any damage, replace the PS12 line.

 (3) Make sure that all piping connections are correctly tightened. If they are loosen, tighten them.

 (4) If you find no damage on the PS12 line:

 - disconnect the PS12 line from the ECU

 - blow filtered dry air or nitrogen from the ECU (4000KS) side fitting into the PS12 line to clear it in case of any blockage

 - clean the weep hole with a non metallic wire (max diameter: 0.5 mm).

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 - do a check of the engine LRU identification screen with the CFDS to see if the engine rating coded though the engine identification plug is correct.
 (a) If the rating is not correct:

 - replace the engine identification plug.

 (b) If the rating is correct:

 - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
 B. After the subsequent flight, make sure that the fault does not continue.
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 1. Possible Causes
 Fan Vibration less than 4 Units with Noise / Rumble _______________
 - fan blades

 - LPT Stage 4 blades

 - fan blades mid-span shrouds

 2. Job Set-up Information______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
R R R  AMM AMM AMM AMM  71-00-00-750-001 72-21-00-210-004 72-21-00-210-009 72-54-00-290-006 
3. Fault Confirmation__________________
 A. Test

Fan Trim Balance - 1 Sensor 3 Speed Detailed Inspection and Relubrication of Fan Blade Dovetails, Midspan Shrouds, Retainers, Spacers, Dampers and Fan Disk Dovetail SlotsInspect Fan Rotor Blades Installed on the Fan DiskInspection of the Stage 4 Blades
 (1) Not applicable, the fault is evident.
 4. Fault Isolation
_______________
 A. If the fault symptom is identified on the lower ECAM display unit by the crew observation: ENG 1(2)-FAN VIBRATION less than 4 units along with noise/rumble
 NOTE : Trouble Shooting is recommended at next maintenance opportunity
____ not interfering with Revenue Service Operation.
 (1) Do a check of the fan blades (Ref. AMM TASK 72-21-00-210-009) and LPT Stage 4 blades for shingling or damage.

 (a) If the check is not correct:
 - if fan blade damage or mid-span shroud shingling, repair as necessary,
　
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