DOC AIRBUS | TSM A320FN2 Speed on Engine 1 more or less than on Engine 2
1. Possible Causes
· HP Compressor
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 72-00-00-200-013 Borescope Inspection of inside of Combustion Chamber and HP turbine
stage 1 Vanes
Ref. AMM 72-00-00-200-014 Borescope Inspection of the Stage 1 High Pressure Turbine (HPT)
Blades and Duct Segments
Ref. AMM 72-00-00-200-015 Borescope Inspection of the Stage 2 HPT Blades and Duct Segments
Ref. AMM 72-00-00-200-016 Inspection of the HP Compressor
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 77-00-00-710-159-A
A. Test
Not applicable.
4. Fault Isolation
Subtask 77-00-00-810-126-A
A. If the fault symptom is identified by the crew observation: ENG1 - N2 speed more or less than on engine
2:
· Do an inspection of the VSV mechanism Ref. AMM 75-32-42-200-010 .
· Replace any damaged components as necessary.
(1) If the fault continues:
· Do a functional test of the bleed valve and solenoid operation on engine 1 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 .
NOTE: For additional information on bleed valve effects on engine operation, refer to (Ref. 75-00-00
Page Block 301 Task Supporting Data) and (Ref. TSM 75-00-00-810-804) .
· Do the high power assurance test Ref. AMM 71-00-00-710-013 .
(2) If there is no fault:
· Do the inspection of the HP Compressor Ref. AMM 72-00-00-200-013 , Ref.
AMM 72-00-00-200-014 , Ref. AMM 72-00-00-200-015 and Ref. AMM 72-00-00-200-016 . [Rev.6 from Feb 2017] 2026.04.04 04:37:49 UTC