1 If nothing is found:
_
 - do a FADEC motoring test (Ref. AMM TASK 73-29-00-710-040) and check for VBV doors operation during the test with reverser cowls opened,

 - visually check that all doors move together smoothly and freely.

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 F 『 E C F M E E E E 56 E E E a If trouble is found:

_
 - repair or replace damaged parts.
 NOTE : The VBV doors may be found in any position with the
____ engine being stopped. If the VBV doors are not found in the fully closed position, this is not indicating an abnormal condition or a system failure. However, all doors must be set at the same angular position.
 b If nothing is found:
_
 - replace the HMU (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002)
 2 If the fault continues:
_
 - check again the Post Flight Report (PFR), Scheduled Maintenance Report (SMR) and Class 3 Report (Ref. AMM TASK 73-21-60-740-026).
 a If any message is present:
_
 - do the applicable trouble shooting (Ref. TASK 70-00-00-810-801).
 b If none of the above listed fault messages is present:
_
 - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
 D. Repair Confirmation
 (1) Do one of these two optional procedures:
 (a) Option 1 Operate the engine at the thrust levels and engine loads at which the stall/surge occurred and look for operational problems. If the test is satisfactory, then interrogate the PFR and the SMR Report, if no internal VSV, VBV, T25 or N2 maintenance message shows , then you corrected the problem.

 (b) Option 2 Record the maintenance procedures that have been performed during the inspection/trouble shooting procedure, monitor the engine/airplane on subsequent flights.

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 TASK 73-00-00-810-866
 Stall of the engine 1 or 2 / Audible stall / Engine surge
 1. Possible Causes
_______________
 - engine

 - VSV

 - T12

 - T25

 - PS3

 - VBV

 - RACSB

 - TBV

 - NACTB

 - IP check valve

 - HMU

 - ECU

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
70-00-00-810-801 Engine Failure(s) 80-00-00-810-833 Stall of the Engine 1 or 2 AMM 36-11-41-200-001 Inspection/Check of the IP Bleed Check Valve AMM 72-00-00-100-009 Washing of the Engine Gas Path with Pure Water AMM 72-00-00-200-006 Inspection/Check of Foreign Objet Damage (FOD) (Bird
 Strike Included)
 AMM 72-21-00-290-003  Borescope Inspection of the Booster Rotor Blades, Stages 2,3,4 and 5 through the Booster Inlet and Borescope Ports SO3 and SO5
 AMM 72-31-00-290-002 Inspection of the High Pressure Compressor Rotor Assembly AMM 72-52-00-290-001 Borescope Inspection of the High-Pressure Turbine
 Blades (from the rear) AMM 72-54-00-290-005 Inspection of the Stage 1-3 Blades AMM 73-21-10-000-002 Removal of the Hydromechanical Unit (HMU) AMM 73-21-10-400-002 Installation of the Hydromechanical Unit (HMU) 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)
R AMM 73-21-60-740-007 Correct Time Limited Faults (Non Asterisked) of the R Engine Scheduled Maintenance Report AMM 79-00-00-281-002 Check of the Electrical Master Chip Detector for Particles
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 3. Fault Confirmation
__________________
 A. Not applicable, the confirmation can cause damage to the engine.
 4. Fault Isolation
_______________
 A. If affected by SB 72-0391:
R NOTE : Refer to CFM SB 72-0391 and if necessary, do a borescope
____ R inspection of the stage 5 booster blades and the abradable.
　
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