The basic parameters which are monitored are the speed and the altitude. Therefore SPEEL decided to develop its own ADCs, which are optimized for its own data recording solutions.

ADC-159 is a compact unit that is intended for aircraft pressure altitude and airspeed measurement with high-precision thanks to the use of high-accuracy and high-reliability pressure sensors designed specifically for avionics applications where robustness and exceptional low drift characteristics are essential to system performance.

ADU-39 was designed for applications where the speed and altitude are intended only for the record. Its advantages are small size, light weight and not least the price is acceptable for customers with limited resources.