F EEFF : ALL E E ECES Removal of the Hydromechanical Unit (HMU)Installation of the Hydromechanical Unit (HMU)Removal of the HJ8 HarnessVisual Inspection of the Wiring HarnessesInstallation of the HJ8 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
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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
Sensor AMM 75-31-70-400-002 Installation of the Variable Bleed Valve position Sensor
3. Fault Confirmation
__________________
A. Do the operational test of the FADEC 2B on the ground (with engine motoring) (Ref. AMM TASK 73-29-00-710-040).
NOTE : The maintenance message is generated if the actual position and
____ the demanded position of the VBV system disagree (only the position of VBV master actuator door is monitored).
NOTE : There is no expected position of the VBV actuators on a running
____ engine. The position of the VBV actuators must be uniform but can be either open, closed or in an intermediate position.
4. Fault Isolation
_______________
A. If the FADEC test does not give the maintenance message "VBV ACT, HMU":
- do a visual inspection of all the VBV doors actuators and flexible shafts through the fan duct panels, check for offset of position between all VBV doors (all VBV doors not set in the same position) :
(1) If an offset between VBV doors or damage to VBV flexible shafts is observed:
(a) Remove all the flexible shafts (Ref. AMM TASK 75-31-30-000-001).
R (b) Inspect the rod ends of each flexible shaft (Ref. AMM TASK 75-31-
R 30-200-002). Replace any flexible shaft exhibiting excessive wear (Ref. AMM TASK 75-31-30-000-001) and (Ref. AMM TASK 75-31-30-400-001). In case of wear on the flexible shafts ends, all VBV doors shall be inspected and manually operated.
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(c) Operate each of the 11 VBV actuator both directions and make sure that each moves smoothly and freely.
NOTE : During this check, apply a manual load tending to force
____ the door towards its open position. Replace any suspect VBV ballscrew actuator (Ref. AMM TASK 75-31-60-000-002) and (Ref. AMM TASK 75-31-60-400-002).
(2) If nothing is found, following Trouble Shooting must be performed at first opportunity within 10 cyles (except if the fault re-occurs):
- do a check of the rigging of the feedback rod to the VBV position sensor (RVDT) (Ref. AMM TASK 75-31-70-400-002).
(a) Remove all the flexible shafts (Ref. AMM TASK 75-31-30-000-001).
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