Microair Integrates Pitot Probe with Air Data Computer

Microair Avionics this week unveiled the T4000 pitot probe that incorporates an air data computer, attitude and heading reference system (AHRS), angle of attack sensor, static port, anti-icing heater, temperature probe, and magnetometer. Announced during the new product introduction session at the AEA Convention, the integrated probe and air data computer can be installed under FAA non-required safety-enhancing equipment guidelines and is a direct replacement for AN5812 pitot probes.

By EAA AirVenture in July, Brisbane, Australia-based Microair plans to obtain FAA approval for installation in Class 1 and 2 Part 23 airplanes, according to CEO David Withers. Plans call to obtain technical standard order approval and installation approval for Part 25 airplanes.

T4000 features that can be displayed on Microair’s T3000 SkySuite instrument include airspeed, altitude, vertical speed, angle of attack, temperature, attitude, and magnetic heading digital data. The 120-watt anti-icing heater is available in 12- or 24-volt DC configuration with digital temperature control.

The T4000 contains a triple-redundant magnetometer for heading information, and the reason this works with the probe’s heating element is due to the digital circuitry. This allows for the heating current to be switched off when heading information is needed, but so quickly that there is no change apparent to the pilot.

During the brief heating cycles, the probe uses gyro-stabilized information from the built-in AHRS to output proper heading information. Thus, the probe stays at about 110 degrees C all the time, he explained.

“There are a lot of electronics in a small space,” Withers said, and Microair was able to engineer the T4000 because of the evolution of sensor technology. “It’s a complicated piece of equipment in a very small package.”

The non-heated option for a Part 23 airplane retails for AUD$5,229 ($3,644), while the 12- and 24-volt heated unit costs AUD$5,469.