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HPT ACTIVE CLEARANCE CONTROL SYSTEM - FAULT ISOLATION PROCEDURES
________________________________________________________________
TASK 75-21-00-810-803
Failure of the HPTCC Valve Channel A on Engine 1
1. Possible Causes
_______________
- TCC sensor(s)
- High Pressure Turbine Clearance Control (HPTCC) Valve
- Hydromechanical Unit (HMU)
- ECU (4000KS)
- harness HJ7
- High Pressure Turbine Clearance Control (HPTCC) valve
2. Job Set-up Information
______________________
A. Referenced Information
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REFERENCE DESIGNATION
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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 73-21-50-000-040 Removal of the HJ7 Harness
AMM 73-21-50-210-002 Visual Inspection of the Wiring Harnesses
AMM 73-21-50-400-040 Installation of the HJ7 Harness
AMM 73-21-60-000-001 Removal of the Electronic Control Unit (ECU)(4000KS)
AMM 73-21-60-400-001 Installation of the Electronic Control Unit (ECU)(4000KS)
AMM 73-21-70-000-002 Removal of the High Pressure Turbine Clearance Control (HPTCC) Sensor
AMM 73-21-70-400-002 Installation of the High Pressure Turbine Clearance Control (HPTCC) Sensor
AMM 73-29-00-710-040 Operational Test of the FADEC on the Ground (with Engine non Motoring)
AMM 75-21-10-000-002 Removal of the High Pressure Turbine Active Clearance Control (HPTACC) Valve
AMM 75-21-10-400-002 Installation of the High Pressure Turbine Active Clearance Control (HPTACC) Valve
3. Fault Confirmation
__________________
A. Do the operational test of the FADEC 1A on the ground with engine non motoring (Ref. AMM TASK 73-29-00-710-040).
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4. Fault Isolation
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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 1A, on both channels is not confirmed:
(a) No maintenance action required.
(2) If the failure message HPTC VLV (POS), HMU on channel 1A, on one or 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
_ Maintenance Report (SMR)/Class 3 report for TCC SNSR, HJ13, 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).
NOTE : Tighten the connector by hand plus one eighth of a
____ turn. If necessary use soft nose pliers.
a 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.
2 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).
3 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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