EGT Above the Limits on Engine 1 or 2

TASK 80-00-00-810-832-A
EGT Above the Limits on Engine 1 or 2

1. Possible Causes

lower left-hand thermocouple lead assembly
lower right-hand thermocouple lead assembly
upper left-hand thermocouple lead assembly
three-probe thermocouple lead assembly
upper extension lead
lower extension lead
main junction box assembly
ECU [4000KS]
FWC-1 [1WW1]
FWC-2 [1WW2]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 31-53-34-000-001	Removal of the Flight Warning Computer (FWC)
AMM 31-53-34-400-001	Installation of the Flight Warning Computer (FWC)
AMM 71-00-00-710-006	Minimum Idle Check
AMM 72-00-00-200-003	Procedure After the Engine has Exceeded the Operational Limits
AMM 72-00-00-200-008	Inspection/Check After the Engine has Exceeded the Operational Limits
AMM 73-21-60-000-001	Removal of the Electronic Control Unit (ECU)
AMM 73-21-60-400-001	Installation of the Electronic Control Unit (ECU)
AMM 73-29-00-710-040	Operational Test of the FADEC on the ground (with Engine Motoring)
AMM 77-21-10-000-001	Removal of the Upper Extension Lead
AMM 77-21-10-000-002	Removal of the Main Junction Box
AMM 77-21-10-000-003	Removal of the Upper Right Thermocouple Lead Assembly
AMM 77-21-10-000-004	Removal of the Lower Left Thermocouple Lead Assembly
AMM 77-21-10-000-005	Removal of the Lower Right Thermocouple Lead Assembly
AMM 77-21-10-000-006	Removal of the Lower Extension Lead
AMM 77-21-10-000-007	Removal of the Upper Left Thermocouple Lead Assembly
AMM 77-21-10-000-008	Removal of the Upper Extension Lead
AMM 77-21-10-000-009	Removal of the Lower Extension Lead
AMM 77-21-10-000-025	Removal of the Main Junction Box
AMM 77-21-10-000-026	Removal of the Upper Right Thermocouple Lead Assembly
AMM 77-21-10-000-027	Removal of the Lower Left Thermocouple Lead Assembly
AMM 77-21-10-000-028	Removal of the Upper Left Thermocouple Lead Assembly
AMM 77-21-10-000-029	Removal of the Lower Right Thermocouple Lead Assembly
AMM 77-21-10-200-001	Inspection/Check of the T495 Thermocouple Wiring Harness
AMM 77-21-10-200-002	Inspection/Check of the T495 Thermocouple Wiring Harness
AMM 77-21-10-400-001	Installation of the Upper Extension Lead
AMM 77-21-10-400-002	Installation of the Main Junction Box
AMM 77-21-10-400-003	Installation of the Upper Right Thermocouple Lead Assembly
AMM 77-21-10-400-004	Installation of the Lower Left Thermocouple Lead Assembly
AMM 77-21-10-400-005	Installation of the Lower Right Thermocouple Lead Assembly
AMM 77-21-10-400-006	Installation of the Lower Extension Lead
AMM 77-21-10-400-007	Installation of the Upper Left Thermocouple Lead Assembly
AMM 77-21-10-400-008	Installation of the Upper Extension Lead
AMM 77-21-10-400-009	Installation of the Lower Extension Lead
AMM 77-21-10-400-025	Installation of the Main Junction Box
AMM 77-21-10-400-026	Installation of the Upper Right Thermocouple Lead Assembly
AMM 77-21-10-400-027	Installation of the Lower Left Thermocouple Lead Assembly
AMM 77-21-10-400-028	Installation of the Upper Left Thermocouple Lead Assembly
AMM 77-21-10-400-029	Installation of the Lower Right Thermocouple Lead Assembly
AMM 80-11-20-000-001	Removal of the Starter Shutoff Valve
AMM 80-11-20-000-003	Removal of the Starter Shutoff Valve
AMM 80-11-20-400-001	Installation of the Starter Shutoff Valve
AMM 80-11-20-400-003	Installation of the Starter Shutoff Valve

3. Fault Confirmation
Subtask 80-00-00-710-115-A ** ON A/C NOT FOR ALL

A. Test
(1) Not applicable, the fault is evident.

4. Fault Isolation
Subtask 80-00-00-810-093-A ** ON A/C NOT FOR ALL

A. If the fault symptom is identified by the message START FAULT-EGT OVERLIMIT on the upper ECAM display unit and if the EGT is more than 725°C:
(1) Do the inspection/check after overshoot of engine operational limits AMM 72-00-00-200-003.
(2) Do the operational test of the FADEC on the ground (with engine motoring) AMM 73-29-00-710-040.
(3) Do a check of the air pressure for the starter (at least 30 PSIG).
(4) Replace the starter shutoff valve AMM 80-11-20-000-001 and AMM 80-11-20-400-001.
(5) Do an inspection/check of the T495 thermocouple wiring harness for isolation of the defective part AMM 77-21-10-200-001:

if the electrical check of the three two-probe lead assemblies is not correct, replace the defective thermocouple:
. the lower left-hand thermocouple lead assembly AMM 77-21-10-000-004 and AMM 77-21-10-400-004 or
. the lower right-hand thermocouple lead assembly AMM 77-21-10-000-005 and AMM 77-21-10-400-005 or
. the upper left-hand thermocouple lead assembly AMM 77-21-10-000-007 and AMM 77-21-10-400-007
if the electrical check of the three-probe lead assembly is not correct:
. replace three-probe thermocouple lead assembly AMM 77-21-10-000-003 and AMM 77-21-10-400-003
if the electrical check of the upper extension lead is not correct:
. replace the upper extension lead AMM 77-21-10-000-001 and AMM 77-21-10-400-001
if the electrical check of the lower extension lead is not correct:
. replace the lower extension lead AMM 77-21-10-000-006 and AMM 77-21-10-400-006.
if the electrical check of the main junction box assembly is not correct:
. replace the main junction box assembly AMM 77-21-10-000-002 and AMM 77-21-10-400-002.

(6) If the fault continues:

replace the ECU [4000KS] AMM 73-21-60-000-001 and AMM 73-21-60-400-001.

(7) If the fault continues:

replace the FWC-1 [1WW1] or the FWC-2 [1WW2] AMM 31-53-34-000-001 and AMM 31-53-34-400-001.

Subtask 80-00-00-810-093-B ** ON A/C NOT FOR ALL

A. If the fault symptom is identified by the message START FAULT-EGT OVERLIMIT on the upper ECAM display unit and if the EGT is more than 725°C:
(1) Do the inspection/check after overshoot of engine operational limits AMM 72-00-00-200-008.
(2) Do the operational test of the FADEC on the ground (with engine motoring) AMM 73-29-00-710-040.
(3) Do a check of the air pressure for the starter (at least 30 PSIG).
(4) Replace the starter shutoff valve AMM 80-11-20-000-003 and AMM 80-11-20-400-003.
(5) Do an inspection/check of the T495 thermocouple wiring harness for isolation of the defective part AMM 77-21-10-200-002:

if the electrical check of the three two-probe lead assemblies is not correct, replace the defective thermocouple:
. the lower left-hand thermocouple lead assembly AMM 77-21-10-000-027 and AMM 77-21-10-400-027 or
. the lower right-hand thermocouple lead assembly AMM 77-21-10-000-029 and AMM 77-21-10-400-029 or
. the upper left-hand thermocouple lead assembly AMM 77-21-10-000-028 and AMM 77-21-10-400-028
if the electrical check of the three-probe lead assembly is not correct:
. replace three-probe thermocouple lead assembly AMM 77-21-10-000-026 and AMM 77-21-10-400-026, AMM 77-21-10-000-027 and AMM 77-21-10-400-027, AMM 77-21-10-000-028 and AMM 77-21-10-400-028, AMM 77-21-10-000-029 and AMM 77-21-10-400-029.
if the electrical check of the upper extension lead is not correct:
. replace the upper extension lead AMM 77-21-10-000-008 and AMM 77-21-10-400-008
if the electrical check of the lower extension lead is not correct:
. replace the lower extension lead AMM 77-21-10-000-009 and AMM 77-21-10-400-009.
if the electrical check of the main junction box assembly is not correct:
. replace the main junction box assembly AMM 77-21-10-000-025 and AMM 77-21-10-400-025.

(6) If the fault continues:

replace the ECU [4000KS] AMM 73-21-60-000-001 and AMM 73-21-60-400-001.

(7) If the fault continues:

replace the FWC-1 [1WW1] or the FWC-2 [1WW2] AMM 31-53-34-000-001 and AMM 31-53-34-400-001.

Subtask 80-00-00-710-116-A ** ON A/C NOT FOR ALL

B. Do a minimum idle check to make sure that all engine instruments give the correct indication AMM 71-00-00-710-006.

[Rev.8 from Aug 2018] 2026.04.04 04:38:37 UTC