TAT SENSOR on A320 and how it works

Описание: Total Air Temperature (TAT) Probes play a crucial role in flight operations, influencing fuel temperatures on long journeys, guiding anti-ice system usage based on both TAT and static air temperature (SAT), aiding in Mach number and true airspeed calculations essential for cruise flight and navigation, and providing the necessary data for engine thrust settings and auto throttles.

little bit more about in on A320:
The aircraft is equipped with two TAT sensors with two sensing elements each. The sensing elements of the sensor have variable resistances. The TAT sensor 1 is linked to the ADR portion of ADIRUs 1 and 3, and the TAT sensor 2 is linked to the ADR portion of ADIRU 2.
The TAT sensors are set at 2.33 m from the nose and at 0.60 m of the aircraft axis below the fuselage. The TAT sensor 1 is located on the left side and the TAT sensor 2 is on the right side.
The airflow enters the scoop of the sensor, goes through a calibrated choke and flows over the hermetically sealed platinum resistance sensing element where the temperature is measured. The speed of the flow over the element is controlled by the choke in the element tube.
The ADR portion is designed to operate with a 500 ohms (at 0 deg. C ) temperature sensor unit corresponding to the basic Callender - Van Dusen equation. To improve the accuracy of the sensor, a network of precision resistors is used. This technique is identified by the term Precision Calibration Interchangeability (PCI).
These sensors are heated with 115VAC through the probe heating system. The heating element must not be energized on the ground.
The heating element is implanted in the scoop and strut and keeps the probe free of ice under the most severe icing conditions.

********video is just for information purposes always stick to the latest maintenance manual********



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