EGT on Engine 2 more than on Engine 1

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1. Possible Causes
· HPT/LPT ACC air valve
· ACTUATOR-ACC ( 4027KS )
2 Job Set-up Information
A. Referenced Information
REFERENCE DESIGNATION
75-00-00-810-804-B Hung Start/Hot Start/Stall - Effect of HPC Bleed System on Engine Operation
Ref. AMM 71-00-00-710-013 Test No.11 : High Power Assurance Test
Ref. AMM 72-00-00-200-016 Inspection of the HP Compressor
Ref. AMM 72-31-11-100-010 Cleaning of the LP Compressor Blades
Ref. AMM 75-24-51-000-010 Removal of the HPT/LPT ACC Air Valve
Ref. AMM 75-24-51-400-010 Installation of the HPT/LPT ACC Air Valve
Ref. AMM 75-24-52-000-010 Removal of the High Pressure Turbine/Low Pressure Turbine (HPT/
LPT) Valve Actuator
Ref. AMM 75-24-52-400-010 Installation of the High Pressure Turbine/Low Pressure Turbine (HPT/
LPT) Valve Actuator
Ref. AMM 75-32-42-200-010 Inspection of the VSV Mechanism
Ref. AMM 75-32-51-700-010 Functional Test of the HPC Stage 7 Solenoid Valve with Test Set
IAE2R19437
Ref. AMM 75-32-52-700-011 Functional Test of the HPC Stage 7 Bleed Valve with Test Set
IAE2R19437
Ref. AMM 75-32-53-700-010 Functional Test of the HPC Stage 10 Solenoid Valve with Test Set
IAE2R19437
Ref. AMM 75-32-54-700-011 Functional Test of the HPC Stage 10 Bleed Valve with Test Set
IAE2R19437
3. Fault Confirmation
Subtask 77-00-00-710-158-A
A. Test
Not applicable.
4. Fault Isolation
Subtask 77-00-00-810-125-A
A. If the fault symptom is identified by the crew observation: ENG2 - EGT more than on engine 1:
· Do the functional test of the bleed valve and solenoid operation on engine 2 Ref.
AMM 75-32-51-700-010 , Ref. AMM 75-32-52-700-011 , Ref. AMM 75-32-53-700-010 and Ref.
AMM 75-32-54-700-011 .
· Do the high power assurance test Ref. AMM 71-00-00-710-013 .
NOTE: For additional information on bleed valve effects on engine operation, refer to
(Ref. TSM 75-00-00-810-804) .
(1) If the fault continues:
· Do an inspection of the VSV mechanism Ref. AMM 75-32-42-200-010 .
· Replace any damaged components as necessary.
(2) If the fault continues:
· Replace the HPT/LPT ACC air valve Ref. AMM 75-24-51-000-010 and Ref.
AMM 75-24-51-400-010 .
(3) If the fault continues:
· Replace the ACTUATOR-ACC ( 4027KS ) Ref. AMM 75-24-52-000-010 and Ref.
AMM 75-24-52-400-010 .
(4) If the fault continues:
· Do the borescope inspection of the HP system Ref. AMM 72-00-00-200-016 .
(5) If the fault continues:
· Do the visual inspection of the air offtakes for signs of important leakage on engine 2.
(6) If the fault continues:
· Examine the HPC stage 10 piston ring.
(7) If the fault continues:
· Do a cleaning of the LP compressor Ref. AMM 72-31-11-100-010 . [Rev.6 from Feb 2017] 2026.04.04 04:37:49 UTC