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4 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).
5 If the fault continues:
_
- replace the harness HJ7 (Ref. AMM TASK 73-21-50-000-040) and (Ref. AMM TASK 73-21-50-400-040).
(3) If the failure message HPTC VLV (POS), HMU on channel 1A is confirmed:
(a) Disconnect the harness HJ7 from the ECU and do a check of resistance between: . pins 23 and 24 (17 to 23 Ohms).
1 If the resistance values are in the specified limits:
_
- 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).
a 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).
b 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).
c If the fault continues:
_
- replace the harness HJ7 (Ref. AMM TASK 73-21-50-000-040) and (Ref. AMM TASK 73-21-50-400-040).
(b) If the resistance values are out of the specified limits:
- disconnect the harness HJ7 from the HMU and do a check of the HMU resistance between: . pins 23 and 24 (17 to 23 Ohms).
1 If the resistance values are in the specified limits:
_
- replace the harness HJ7 (Ref. AMM TASK 73-21-50-000-040) and (Ref. AMM TASK 73-21-50-400-040).
R 2_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).
NOTE : Tighten the connector by hand plus one eighth of a
____ turn. If necessary use soft nose pliers.
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B. Do the test given in para. 3.
(1) No additional maintenance action is required if the fault is not confirmed.
R (2) Continue the fault isolation procedure if the fault continues.
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Failure of the HPTCC Valve Channel A on Engine 2
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
-------------------------------------------------------------------------------
REFERENCE DESIGNATION
-------------------------------------------------------------------------------
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 2A on the ground with engine non motoring (Ref. AMM TASK 73-29-00-710-040).
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