- replace or repair as necessary.
(b) If nothing is found:
- Disconnect the J13 harness from the ECU (4000KS), and visually examine the ECU receptacle and the harness connector for damaged pins or contamination (Ref. AMM TASK 73-21-50-210-001).
1 If damage is found:
_ - repair or replace as required.
2 If nothing is found, continue the troubleshooting as follows.
_
(3) Do a visual inspection of the J13 and CJ13 harnesses connectors for looseness.
(a) If a connector is found loose:
- do a cleanning of the connector and the receptacle using a bristle brush and stoddart solvant (CP 2011) or white spirit (CP 2010) (Ref. AMM TASK 73-21-50-210-001)
(b) If nothing is found:
- do a visual inspection of the T495 probes lead assemblies and check for damage.
1 If damage is found:
_
- repair or replace damaged hardware as required.
(4) If the fault continues during the subsequent flight:
- Do an electrical resistance test through the Main Electrical Junction Box between: . pins A and B (1 to 10 ohms) . pin A and the ground (> 20 megohms)
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(a) If the resistances are out of the specified limits:
- Do an electrical resistance test of the T495 thermocouple wiring harness (probes lead assemblies and extension leads assemblies) (Ref. AMM TASK 77-21-10-200-001)
(b) If the resistances are in the specified limits:
- replace the CJ13 Harness (Ref. AMM TASK 73-21-50-000-005) and (Ref. AMM TASK 73-21-50-400-005).
(5) If the fault continues during the subsequent flight:
- Replace the Main Junction Box assembly (Ref. AMM TASK 77-21-10-000-002) and (Ref. AMM TASK 77-21-10-400-002).
(6) If the fault continues during the subsequent flight:
- Replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
(7) If the fault continues during the subsequent flight:
- Replace the J13 Harness (Ref. AMM TASK 73-21-50-000-012) and (Ref. AMM TASK 73-21-50-400-012).
5. Close-up________
A. Do a minimum idle check (Ref. AMM TASK 71-00-00-710-006).
(1) Repeat the fault isolation procedure, if the fault continues.
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The EGT indication fluctuates while other parameters are stable
1. Possible Causes_______________
- T495 probes
- Main Electrical Junction Box
- CJ13 Harness
- ECU (4000KS)
- J13 Harness
2. Job Set-up Information______________________
A. Referenced Information
-------------------------------------------------------------------------------
REFERENCE DESIGNATION
-------------------------------------------------------------------------------
AMM 71-00-00-710-006 Minimum Idle Check
AMM 73-21-50-000-005 Removal of the CJ13 Harness
AMM 73-21-50-000-012 Removal of the J13 Harness
AMM 73-21-50-210-001 Visual Inspection of the Wiring Harness
AMM 73-21-50-400-005 Installation of the CJ13 Harness
AMM 73-21-50-400-012 Installation of the J13 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 73-21-60-740-007 Correct Time Limited Faults (Non Asterisked) of the Engine Scheduled Maintenance Report
AMM 77-21-10-000-002 Removal of the Main Junction Box
AMM 77-21-10-200-001 Inspection/Check of the T495 Thermocouple Wiring Harness
AMM 77-21-10-400-002 Installation of the Main Junction Box
3. Fault Confirmation__________________
A. Test
(1) Not applicable.
NOTE : Most likely cause for an EGT fluctuation (while other
____ parameters are stable) is oxidation deposit on the CJ13 harness connector onto the junction box receptacle. Therefore, as a first attempt to fix the fault, the connector/receptacle (CJ13 harness connector and Main Junction Box receptacle) must be cleaned per procedure here below.
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