E 56 E E E TASK 77-00-00-810-859

 N1 Mismatch during Flex Take Off 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 during flex take off:
 (1) Do the trouble shooting procedure on the engine with the lowest 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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ECES  E 56 E E E (5) If the fault continues:

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 - do a check of the engine LRU identification screen with the CFDS to see if the engine rating coded through 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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ECES

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 E 56 E E E TASK 77-00-00-810-860

 N1 Mismatch during Take Off 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 take off:
 (1) Do the trouble shooting procedure on the engine with the lowest 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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ECES  E 56 E E E (5) If the fault continues:

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 E  C F M  E
 E  E

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