03/03/21
Message Overview:
Message Description:
Both channels of the Left Inboard Wing Leading Edge Temperature Sensor are detected failed, or a disagreement between both channels of the sensor is detected.
Possible Causes:
- Left Inboard Temperature Sensor (MT41)
- Associated Wiring
Troubleshooting Tips:
Advisory Wire/Service Bulletin: None
Forum Articles/Infoservice/Newsletter: None
Quick Links:
| Removal of the Integrated Air System (IAS) Controller | AMM 21-31-01-000-801 |
| Installation of the Integrated Air System (IAS) Controller | AMM 21-31-01-400-801 |
| Operational Test of the Leading-Edge Temperature Sensors | AMM 30-11-00-710-801 |
| Removal of the Inboard Leading-Edge Temperature Sensor | AMM 30-11-01-000-801 |
| Installation of the Inboard Leading-Edge Temperature Sensor | AMM 30-11-01-400-801 |
| Wiring - Maintenance Practices - ALL | SPM 20-12-00-02 |
| Wire Repair - Maintenance Practices - ALL | SPM 20-12-10-02 |
Troubleshooting Recommendations:
- Do Operational Test of the Leading-Edge Temperature Sensors.
- If the test is satisfactory, do close out.
- If the test is not satisfactory, continue with next step.
- Do wiring check between the Left IASC (A55) and the Left Inboard Temp Sensor (MT41).
From To Results Conn. A55P3 - 12 Splice SP80 Conn. A55P3 - 13 Splice SP81 - If the check is satisfactory, continue with next step.
- If the check is not satisfactory, repair defective wire.
- Do wiring check between the Right IASC (A56) and the Left Inboard Temp Sensor (MT41).
From To Results Conn. A56P3 - 12 Splice SP85 Conn. A56P3 - 13 Splice SP86 - If the check is satisfactory, continue with next step.
- If the check is not satisfactory, repair defective wire.
- Replace Left Inboard Temp Sensor (MT41).
- Do close out.