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 1. Possible Causes
 Failure of the HPTCC Valve Channel B on Engine 2 _______________
 - TCC sensor(s)

 - High Pressure Turbine Clearance Control (HPTCC) Valve

 - Hydromechanical Unit (HMU)

 - ECU (4000KS)

 - harness HJ8

 2. Job Set-up Information______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM  73-21-10-000-002 
AMM  73-21-10-400-002 
AMM  73-21-50-000-041 
AMM  73-21-50-210-002 
AMM  73-21-50-400-041 
AMM  73-21-60-000-001 
AMM  73-21-60-400-001 
AMM  73-21-70-000-002 
AMM  73-21-70-400-002 
AMM  73-29-00-710-040 
AMM  75-21-10-000-002 
AMM  75-21-10-400-002 

3. Fault Confirmation
__________________
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)(4000KS)Installation of the Electronic Control Unit (ECU)(4000KS)Removal of the High Pressure Turbine Clearance Control (HPTCC) SensorInstallation of the High Pressure Turbine Clearance Control (HPTCC) SensorOperational Test of the FADEC on the Ground (with Engine non Motoring)Removal of the High Pressure Turbine Active Clearance Control (HPTACC) ValveInstallation of the High Pressure Turbine Active Clearance Control (HPTACC) Valve
 A. Do the operational test of the FADEC 2 on the ground with engine non motoring (Ref. AMM TASK 73-29-00-710-040).
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 4. Fault Isolation
_______________
 A. The failure message is triggered if there is a difference between the actual position and the feedback position of the valve of more than 5% and the fault continues for more than 7 seconds.
 (1) If the failure message HPTC VLV (POS), HMU on channel 2B, on both channels is not confirmed:
 (a) No maintenance action required.
 (2) If the failure message HPTC VLV (POS), HMU on channel 2B, on one or R both channels is not confirmed but is repetitive:
 (a) Do the following trouble shooting at next maintenance opportunity:
 1 Do a check of the Post Flight Report (PFR) and the Schedule
_ R Maintenance Report (SMR)/Class 3 report for TCC SNSR, J13, R ECU.
 If the failure message is present: R - disconnect the TCC sensor(s).
 NOTE : Engines post SB 73-046 are equipped with only one
____
 sensor.

 - do a cleaning of the harness connectors and receptacles
R  using a bristle brush with stoddart solvent (CP 2011) (Ref. AMM TASK 73-21-50-210-002).
 - reconnect the connectors to the TCC sensor(s).
R  NOTE : Tighten the connector by hand plus one eighth of a
____ R turn. If necessary use soft nose pliers.
R
R  2_If the fault continues:
 - replace the TCC sensor(s) (Ref. AMM TASK 73-21-70-000-002) and (Ref. AMM TASK 73-21-70-400-002).
 NOTE : Engines post SB 73-046 are equipped with only one
____
 sensor.

R  3_If the fault continues:
 - replace the High Pressure Turbine Clearance Control (HPTCC) Valve (Ref. AMM TASK 75-21-10-000-002) and (Ref. AMM TASK 75-21-10-400-002).
R  4_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).
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R  5 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). 
　
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