EGT Indication Disagreement between DMC and FWC on Engine 1

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1. Possible Causes
· EGT thermocouples
· DMC-1 ( 1WT1 )
· DMC-2 ( 1WT2 )
· DMC-3 ( 1WT3 )
· FWC-1 ( 1WW1 )
· FWC-2 ( 1WW2 )
· EEC ( 4000KS )
2 Job Set-up Information
A. Referenced Information
REFERENCE DESIGNATION
77-20-00-810-801-B Loss of the EGT Thermocouples on Engine 1
Ref. AMM 31-53-34-000-001 Removal of the Flight Warning Computer (FWC)
Ref. AMM 31-53-34-400-001 Installation of the Flight Warning Computer (FWC)
REFERENCE DESIGNATION
Ref. AMM 31-63-34-000-001 Removal of the DMC
Ref. AMM 31-63-34-400-001 Installation of the DMC
Ref. AMM 71-00-00-710-012 Test No.3 : Idle Leak Check
Ref. AMM 73-22-34-000-010 Removal of the Electronic Engine Control (EEC)
Ref. AMM 73-22-34-400-010 Installation of the Electronic Engine Control (EEC)
3. Fault Confirmation
Subtask 77-00-00-710-183-A
A. Test
(1) Not applicable.
4. Fault Isolation
Subtask 77-00-00-810-141-A
A. If the fault symptom is identified by the ECAM warning ENG1 EGT DISCREPANCY:
(1) Check the EGT thermocouples by following (Ref. TSM TASK 77-20-00-810-801) for A1
configurations and (Ref. TSM 77-20-00-810-801) for A5 configurations.
(2) Replace the DMC-1 ( 1WT1 ) Ref. AMM 31-63-34-000-001 and Ref. AMM 31-63-34-400-001 .
(3) If the fault continues:
· Replace the DMC-2 ( 1WT2 ) Ref. AMM 31-63-34-000-001 and Ref. AMM 31-63-34-400-001 .
(4) If the fault continues:
· Replace the DMC-3 ( 1WT3 ) Ref. AMM 31-63-34-000-001 and Ref. AMM 31-63-34-400-001 .
(5) If the fault continues:
· Replace the FWC-1 ( 1WW1 ) Ref. AMM 31-53-34-000-001 and Ref. AMM 31-53-34-400-001 .
(6) If the fault continues:
· Replace the FWC-2 ( 1WW2 ) Ref. AMM 31-53-34-000-001 and Ref. AMM 31-53-34-400-001 .
(7) If the fault continues:
· Replace the EEC ( 4000KS ) Ref. AMM 73-22-34-000-010 and Ref. AMM 73-22-34-400-010 .
Subtask 77-00-00-710-184-A
B. Test
(1) Do a minimum idle check to make sure that all engine instruments give the correct indication Ref.
AMM 71-00-00-710-012 . [Rev.6 from Feb 2017] 2026.04.04 04:37:49 UTC