02/02/21
Message Overview
Message Description:
Both channels of the COCKPIT VENTILATED TEMPERATURE SENSOR are detected failed. Check for the sensor failure.
Possible Causes:
- Cockpit Vent Temp Sensor (MT037)
Troubleshooting Tips:
Advisory Wire/ Service Bulletin:
- AW300-21-0045 - Erratic Temperature Control in Auto Mode (20003 - 20500)
Forum Articles/Infoservice/Newsletter: None
Quick Links:
| Operational Test of the Integrated Air System (IAS) Controller | AMM 21-31-01-710-801 |
| Removal of the Flight-Compartment Ventilated Temperature-Sensor | AMM 21-61-25-000-801 |
| Installation of the Flight-Compartment Ventilated Temperature-Sensor | AMM 21-61-25-400-801 |
| Standard Practices - Replace Wiring | SPM 20-12-00-02 |
| Standard Practices - Wire Repair | SPM 20-12-10-02 |
Troubleshooting Recommendations:
- Clean Cockpit Vents (MT28). Ref AW300-21-0045 for information. See if the fault clears.
- Check and reset circuit breaker CB2 E10 R WING BLD LK.
- Check for 28 VDC at the cockpit ventilated temperature sensor MT37P1 between pins 1 (Pos.), 2 (Neg.). Fix or repair wiring as required.
- Swap cockpit and cabin VENTS or replace the cockpit vent to see if fault follows, IAW AMM.
- If the fault still exists, gain access to IASC 1 and IASC 2 and check the following:
- IASC 1 Plug A55P1, check pin 52 to ground and pin 30 to ground.
- IASC 1 Plug A55P1, check pin 52 to 30. Record resistance then swap leads and recheck, (there's a diode in the VENTS).
- IASC 2 Plug A56P1, check pin 52 to ground and pin 30 to ground.
- IASC 2 Plug A56P1, check pin 52 to 30. Record resistance then swap leads and recheck, (there's a diode in the VENTS).
- Operational test IAW AMM TASK 21-61-25-000-801, AMM TASK 21-61-25-400-801.
