- if the fault continues, replace the Hydromechanical Unit (HMU) (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002).

 - If the fault continues, replace the VBV sensor (RVDT) (Ref. AMM TASK 75-31-70-000-002) and (Ref. AMM TASK 75-31-70-400-002).

 - If the fault continues, replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).

 b If the resistance values are out of the specified limits:
_
 - disconnect the harness HJ7 from the HMU and visually examine the receptacle and connector for damage pin or contamination (Ref. AMM TASK 73-21-50-210-002)

 - do a check of the HMU resistance between: . pins 29 and 30 (17 to 23 Ohms).

 * If the resistance values are in the specified limits:

 - replace the defective harness HJ7 (Ref. AMM TASK 73-21-50-000-040) and (Ref. AMM TASK 73-21-50-400-040) or

 * If the resistance values are out of the specified limits:

 - replace the Hydromechanical Unit (HMU) (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002).

 C. Do the test given in Para. 3.A.
 (1) If the fault is not confirmed:

 - no additional maintenance action is required.

 (2) If the fault continues:

 - repeat the fault isolation procedure.
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 Failure of the Control of the VBV Actuator on Engine 2
 1. Possible Causes
_______________
 - VBV ballscrew actuator

 - flexible shaft

 - VBV gear motor

 - VBV stop mechanism

 - VBV master door actuator

 - main flexible shaft

 - VBV Gear Motor

 - VBV sensor (RVDT)

 - ECU (4000KS)

 - Hydromechanical Unit (HMU)

 - harness HJ7

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM AMM AMM AMM AMM AMM AMM AMM  73-21-10-000-002 73-21-10-400-002 73-21-50-000-040 73-21-50-210-002 73-21-50-400-040 73-21-60-000-001 73-21-60-400-001 73-29-00-710-040 
R  AMM  75-31-00-200-001 
AMM AMM  75-31-10-000-002 75-31-10-400-002 
AMM AMM AMM  75-31-20-000-002 75-31-20-400-002 75-31-30-000-001 
AMM AMM  75-31-30-000-002 75-31-30-200-002 
AMM  75-31-30-400-001 
AMM AMM  75-31-30-400-002 75-31-50-000-002 

F EEFF : ALL E E ECES Removal of the Hydromechanical Unit (HMU)Installation of the Hydromechanical Unit (HMU)Removal of the HJ7 HarnessVisual Inspection of the Wiring HarnessesInstallation of the HJ7 HarnessRemoval of the Electronic Control Unit (ECU)Installation of the Electronic Control Unit (ECU)Operational Test of the FADEC on the ground (with Engine Motoring) Manual Operation Check of the Variable Bleed Valve DoorsRemoval of the Bleed Valve Fuel Gear Motor AssemblyInstallation of the Bleed Valve Fuel Gear Motor AssemblyRemoval of the Bleed Valve Stop MechanismInstallation of the Bleed Valve Stop MechanismRemoval of a VBV Inter-connecting Flexible Shaft (Typical).Removal of the VBV System Main Flexible ShaftVisual Inspection of the VBV Main Flexible Shaft and the VBV Inter-connecting Flexible ShaftsInstallation of a VBV Inter-connecting Flexible Shaft (Typical)Installation of the VBV System Main Flexible ShaftRemoval of the Bleed Valve and Master Ballscrew Actuator Assembly
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REFERENCE  DESIGNATION
 -------------------------------------------------------------------------------
AMM 75-31-50-400-002 Installation of the Bleed Valve and Master Ballscrew Actuator Assembly AMM 75-31-60-000-002 Removal of the Bleed Valve and Ballscrew Actuator Assembly AMM 75-31-60-400-002 Installation of the Bleed Valve and Ballscrew
 Actuator Assembly AMM 75-31-70-000-001 Removal of the Variable Bleed Valve Position Sensor AMM 75-31-70-000-002 Removal of the Variable Bleed Valve position Sensor AMM 75-31-70-400-001 Installation of the Variable Bleed Valve Position
　
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