02/03/21
Message Overview:
Message Name:
CH A FAULT
(Service Message)
Message Code:
B3-007661
Associated CAS:
| Reporting LRU: | PACK TEMP SNSR |
| System Description: | 21-61-00 |
| Schematic Diagram: | None |
| Wiring Diagram: | None |
Message Description:
The channel A of the PACK TEMPERATURE SENSOR is detected failed.
Possible Causes:
- Pack Temperature Sensor (MT31)
- Integrated Air System Controller #1 (IASC) (A55)
- Associated Wiring
Troubleshooting Tips:
Advisory Wire/Service Bulletin: None
Forum Articles/Infoservice/Newsletter: None
Fault Confirmation Procedure:
- Message# = 2
- Fault Logged = AIR,TAXI
- Status = FAILED/WIRING
- Message Type = Service Message
- {Term Definitions}
- IAS1A-51 XX 353 00 EXCT XXXX-XXXX XXXX-XXXX TXXX-XXXX 353A: 16; PACK TEMP SNSR A FAIL
- IAS2A-56 XX 353 10 EXCT XXXX-XXXX XXXX-XXXX TXXX-XXXX 353A: 16; PACK TEMP SNSR B FAIL
Quick Links:
| Removal of the Pack Temperature Sensor | AMM 21-52-25-000-801 |
| Installation of the Pack Temperature Sensor | AMM 21-52-25-400-801 |
| Standard Practices - Replace Wiring | SPM 20-12-00-02 |
| Standard Practices - Repair Wiring | SPM 20-12-10-02 |
Troubleshooting Recommendations:
- The channel A of the PACK TEMPERATURE SENSOR is detected failed. Check the sensor or the wiring to the sensor and the IASC #1.