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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 1B, on both channels is not confirmed:
(a) No maintenance action required.
(2) If the failure message HPTC VLV (POS), HMU on channel 1B, 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).
R 6 If the fault continues:_ - replace the harness HJ8 (Ref. AMM TASK 73-21-50-000-041) and (Ref. AMM TASK 73-21-50-400-041).
(3) If the failure message HPTC VLV (POS), HMU on channel 1B is confirmed:
(a) Disconnect the harness HJ8 from the ECU and do a check of resistance between:
R . pins 23 and 24 (17 to 23 ohms).
1 If the resistance values are in 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 HJ8 (Ref. AMM TASK 73-21-50-000-041) and (Ref. AMM TASK 73-21-50-400-041).
(b) If the resistance values are out of the specified limits: - disconnect the harness HJ8 from the HMU and do a check of the
HMU resistance between:
R . pins 23 and 24 (17 to 23 ohms).
R 1 If the resistance values are in the specified limits:_ - replace the harness HJ8 (Ref. AMM TASK 73-21-50-000-041) and (Ref. AMM TASK 73-21-50-400-041).
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 continue.
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