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2 If the resistance values are out of the specified limits:
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- disconnect the cables CJ11L and CJ12L from the TBV valve and do a resistance check of the TBV valve between: . pins 2 and 3 (67 to 75 Ohms) . pins 4 and 5 (23 to 27 Ohms) . pins 6 and 7 (23 to 27 Ohms) . pin 2 and the ground (> 10 Megohms) . pin 4 and the ground (> 10 Megohms) . pin 6 and the ground (> 10 Megohms)
a If the resistance values are in the specified limits:
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- replace the defective: harness CJ11L (Ref. AMM TASK 73-21-50-000-025) and (Ref. AMM TASK 73-21-50-400-025) or harness CJ12L (Ref. AMM TASK 73-21-50-000-027) and (Ref. AMM TASK 73-21-50-400-027).
b If the resistance values are out of the specified limits:
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R - replace the TBV valve (Ref. AMM TASK 75-26-10-000-001)
R and (Ref. AMM TASK 75-26-10-400-001).
(3) Connect the disconnected harnesses.
B. Do the test given in Para. 3.A.
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TASK 75-30-00-810-801
Failure of the Control of the VBV Actuator on Engine 1
1. Possible Causes
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- VBV ballscrew actuator
- flexible shaft
- VBV gear motor
- VBV stop mechanism
- VBV master door actuator
- main flexible shaft
- VBV Gear Motor
- VBV sensor (RVDT)
- VBV Gear Motor.
- 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
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)
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REFERENCE DESIGNATION
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AMM 75-31-30-400-002 Installation of the VBV System Main Flexible Shaft AMM 75-31-50-000-002 Removal of the Bleed Valve and Master Ballscrew Actuator Assembly 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
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