- if the electrical check of the three-probe lead assembly is not correct: . replace the three-probe thermocouple lead assembly (Ref. AMM TASK 77-21-10-000-026) and (Ref. AMM TASK 77-21-10-400-026), (Ref. AMM TASK 77-21-10-000-027) and (Ref. AMM TASK 77-21-10-400-027), (Ref. AMM TASK 77-21-10-000-028) and (Ref. AMM TASK 77-21-10-400-028), (Ref. AMM TASK 77-21-10-000-029) and (Ref. AMM TASK 77-21-10-400-029).
- if the electrical check of the upper extension lead is not correct: . replace the upper extension lead (Ref. AMM TASK 77-21-10-000-008) and (Ref. AMM TASK 77-21-10-400-008).
- if the electrical check of the lower extension lead is not correct: . replace the lower extension lead (Ref. AMM TASK 77-21-10-000-009) and (Ref. AMM TASK 77-21-10-400-009).
- if the electrical check of the main junction box assembly is not correct: . replace the main junction box assembly (Ref. AMM TASK 77-21-10-000-025) and (Ref. AMM TASK 77-21-10-400-025).
B. Do the test given in Para. 3.A.
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1. Possible Causes
Loss of the T3 Thermocouple Signal - Engine 1 - Channel B _______________
- T3 thermocouple
- CJ13 harness
- HJ13 harness
- ECU (4000KS)
2. Job Set-up Information______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 73-21-50-000-029
AMM 73-21-50-000-046
AMM 73-21-50-210-001
AMM 73-21-50-400-029
AMM 73-21-50-400-046
AMM 73-21-60-000-001
AMM 73-21-60-000-001
AMM 73-21-60-400-001
AMM 73-21-60-400-001
AMM 73-29-00-710-040
AMM 77-23-10-000-001
AMM 77-23-10-000-002
AMM 77-23-10-400-001
AMM 77-23-10-400-002
3. Fault Confirmation
__________________
A. Test
Removal of the CJ13 HarnessRemoval of the HJ13 HarnessVisual Inspection of the Wiring HarnessInstallation of the CJ13 HarnessInstallation of the HJ13 HarnessRemoval of the Electronic Control Unit (ECU)(4000KS)Removal of the Electronic Control Unit (ECU)Installation of the Electronic Control Unit (ECU)(4000KS)Installation of the Electronic Control Unit (ECU)Operational Test of the FADEC on the Ground (with Engine non Motoring)Removal of the Compressor Discharge Temperature (T3) SensorRemoval of the Compressor Discharge Temperature (T3) SensorInstallation of the Compressor Discharge Temperature (T3) SensorInstallation of the Compressor Discharge Temperature (T3) Sensor
(1) Do the operational test of the FADEC 1B 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 generated if channel B sensor signal is invalid or out of range.
NOTE : If T3 sensor Part Number is 1348M21P01, P04 or P05, replace T3
____ sensor (Ref. AMM TASK 77-23-10-000-001) and (Ref. AMM TASK 77-23-10-400-001).
(1) If the failure message T3 SENS, J13, ECU is not confirmed:
- no maintenance action is required.
(2) If the failure message T3 SENS, J13, ECU is not confirmed, but is repetitive:
- visually examine the T3 thermocouple receptacle and the CJ13 harness connector for damaged pins and contamination (Ref. AMM TASK 73-21-50-210-001).
(a) If harness connector or T3 thermocouple receptacle is damaged:
- repair or replace as required.
(b) If no damage is found:
- visually examine the ECU (4000KS) receptacle and the HJ13 harness connector for damaged pins and contamination (Ref. AMM TASK 73-21-50-210-001).
1 If harness connector or ECU receptacle is damaged:
_ - repair or replace as required.
2 If no damage is found:
_
- replace the T3 thermocouple (Ref. AMM TASK 77-23-10-000-002) and (Ref. AMM TASK 77-23-10-400-002).
(c) If the fault continues during the subsequent flights:
- replace the CJ13 harness (Ref. AMM TASK 73-21-50-000-029) and (Ref. AMM TASK 73-21-50-400-029).
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