(3) Replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).

 (4) Do the trouble shooting procedure (Ref. TASK 70-00-00-810-801).

 B. Do the test given in Para. 3.A.
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 Engine 1 or 2 Stall/Surge
 1. Possible Causes
_______________
 - VSV

 - N2 SNSR

 - T12

 - T25

 - IP check valve

 - VBV

 - HMU

 - ECU (4000KS)

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
70-00-00-810-801

AMM  36-11-41-000-040 
AMM  36-11-41-200-001 
AMM  36-11-41-400-040 
AMM  72-00-00-200-008 
AMM  73-21-10-000-002 
AMM  73-21-10-400-002 
AMM  73-21-60-000-001 
AMM  73-21-60-400-001 
AMM  73-21-60-740-007 
AMM  73-21-60-740-026 
AMM  73-29-00-710-040 
AMM  75-32-10-210-002 

3. Fault Confirmation
__________________
Engine Failure(s)Removal of the Intermediate Pressure (IP) Bleed Check Valve (7110HM)Inspection/Check of the IP Bleed Check ValveInstallation of the Intermediate Pressure (IP) Bleed Check Valve (7110HM)Inspection/Check After the Engine has Exceeded the Operational LimitsRemoval of the Hydromechanical Unit (HMU)Installation of the Hydromechanical Unit (HMU)Removal of the Electronic Control Unit (ECU)Installation of the Electronic Control Unit (ECU)Correct Time Limited Faults (Non Asterisked) of the Engine Scheduled Maintenance ReportRead the CLASS 3 REPORTOperational Test of the FADEC on the Ground (with Engine Motoring)Inspection of the Variable Stator Vane Actuator
 A. Not applicable (confirmation could cause additional damage to the engine).
 NOTE : The ECAM warning is set if N2 speed is between 50 per cent and 58
____
 per cent and a stall condition is detected by the ECU. The setting R of this ECAM warning indicates that the engine went into subidle R speed.
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R NOTE : This ECAM warning can be set in the air or on the ground.
____
 4. Fault Isolation
_______________
 A. If physical stall was confirmed (Felt/heard by the crew):
 NOTE : Refer to CFM SB 72-0391 and if necessary, do a borescope
____ inspection of the stage 5 booster blades and the abradable.
 (1) do the engine post stall inspection (Ref. AMM TASK 72-00-00-200-008) (Inspection after exceedance of the operational limits).

 (2) Accomplish the Troubleshooting in step 4.C.

 B. If no physical stall condition was confirmed or reported by the crew:
 (1) Ten (10) cycles are allowed before accomplishing the engine post stall inspection (Ref. AMM TASK 72-00-00-200-008) (Inspection after exceedance of the operational limits).

 (2) Accomplish the Troubleshooting in step 4.C.

 C. Troubleshooting operational limits).
 (1) do a check of the post flight report and of the FADEC scheduled maintenance (Ref. AMM TASK 73-21-60-740-007) and Class 3 Reports (Ref. AMM TASK 73-21-60-740-026) for fault messages including the following words: VSV, N2 SNSR, T12, T25, HMU.
 (a) If one of those fault messages is present:

 - do the applicable trouble shooting (Ref. TASK 70-00-00-810-801).

 (b) If no message is found:

 - do an inspection of the IP check valve for correct operation and condition (Ref. AMM TASK 36-11-41-200-001),

 - replace the valve as required (Ref. AMM TASK 36-11-41-000-040) and (Ref. AMM TASK 36-11-41-400-040).

 (c) If nothing is found:

 - do a detailed visual inspection of the VSV system control linkages (Ref. AMM TASK 75-32-10-210-002) and look for any broken or loose components,

 - repair or replace damaged parts.
　
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