How many temperature sensing sources does the ECS have downstream of the heat exchanger to alert the pilot of overtemp?

The Environmental Control System (ECS) in the T-6A has two temperature sensing sources located downstream of the heat exchanger, which are utilized to monitor and alert the pilot in case of an overtemperature condition. This redundancy is critical for the operation and safety of the aircraft, as it provides a reliable means of detecting potentially harmful temperature increases.

Monitoring from two separate sources allows for more accurate detection, as discrepancies can be cross-referenced to ensure that a true overtemperature event is identified, rather than a false reading from one sensor. This two-sensor configuration reduces the likelihood of a system failure going unnoticed, thus enhancing the safety of the flight by ensuring that any issues related to temperature can be promptly addressed.