- if the electrical check of the three-probe lead assembly is not correct: . replace the three-probe thermocouple lead assembly (Ref. AMM TASK 77-21-10-000-026) and (Ref. AMM TASK 77-21-10-400-026), (Ref. AMM TASK 77-21-10-000-027) and (Ref. AMM TASK 77-21-10-400-027), (Ref. AMM TASK 77-21-10-000-028) and (Ref. AMM TASK 77-21-10-400-028), (Ref. AMM TASK 77-21-10-000-029) and (Ref. AMM TASK 77-21-10-400-029).

 - if the electrical check of the upper extension lead is not correct: . replace the upper extension lead (Ref. AMM TASK 77-21-10-000-008) and (Ref. AMM TASK 77-21-10-400-008).

 - if the electrical check of the lower extension lead is not correct: . replace the lower extension lead (Ref. AMM TASK 77-21-10-000-009) and (Ref. AMM TASK 77-21-10-400-009).

 - if the electrical check of the main junction box assembly is not correct: . replace the main junction box assembly (Ref. AMM TASK 77-21-10-000-025) and (Ref. AMM TASK 77-21-10-400-025).

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 C. Do a minimum idle check (Ref. AMM TASK 71-00-00-710-003).
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 The EGT of one engine is significantly higher than on the other engine
 1. Possible Causes
_______________

 - VBV system

 - VSV system

 - pack flow control valves

 - IP check valve

 - T495 thermocouple

 - harness CJ13

 - ECU (4000KS)

 - harness J13

 - Fuel nozzles

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
21-51-00-810-807
21-51-00-810-808

AMM  36-11-41-200-001 
AMM  72-00-00-200-006 
AMM  72-31-00-290-002 
AMM  72-52-00-290-001 
AMM  72-54-00-290-005 
AMM  73-11-40-000-002 
AMM  73-11-40-400-002 
AMM  73-21-50-000-029 
AMM  73-21-50-000-046 
AMM  73-21-50-210-002 
AMM  73-21-50-400-029 
AMM  73-21-50-400-046 
AMM  73-21-60-000-001 
AMM  73-21-60-400-001 
AMM  73-21-60-740-007 
AMM  75-31-00-210-002 
AMM  75-32-10-210-002 
AMM  77-21-10-200-002 

F EEFF : ALL E
R E ECES FCV 1 (FCU 1) Regulation/Indication FaultFCV 2 (FCU 2) Regulation/Indication FaultInspection/Check of the IP Bleed Check ValveInspection/Check of Foreign Objet Damage (FOD) (Bird Strike Included)Inspection of the High Pressure Compressor Rotor AssemblyBorescope Inspection of the High-Pressure Turbine Blades (from the Rear)Inspection of the Stage 1-3 BladesRemoval of the Fuel NozzleInstallation of the Fuel NozzleRemoval of the CJ13 HarnessRemoval of the HJ13 HarnessVisual Inspection of the Wiring HarnessesInstallation of the CJ13 HarnessInstallation of the HJ13 HarnessRemoval of the Electronic Control Unit (ECU)(4000KS)Installation of the Electronic Control Unit (ECU)(4000KS)Correct Time Limited Faults (Non Asterisked) of the Engine Scheduled Maintenance ReportVisual Inspection of the Variable Bleed Valve SystemInspection of the Variable Stator Vane ActuatorInspection/Check of the T495 Thermocouple Wiring Harness
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__________________
 A. Test
 Not applicable.

 4. Fault Isolation
_______________
 A. Do this procedure.
 NOTE : There are many causes that can lead to an EGT sudden shift such as
____ engine deterioration/failure, engine bleed management fault, EGT probes/harness failure, VBV system failure, hot air leak, Foreign Object Damage (FOD), Fuel nozzles contamination, etc...
 NOTE : EGT difference between both engines is function of the engine
____ performance level of each engine and therefore may be normal. Only a sudden shift should lead to initiate the following troubleshooting.
　
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