Sigma Electro Systems manufactures Flight Data Recorder / Tester. Sigma Electro Systems has obtained ISO 9001:2000 certifications. Flight Data Recorder / Tester are equivalent to Russian tester UPAS-1M. Flight Data Recorder / Tester are used extensively in MIG-21, MIG-23, MIG-27, MI-18, MI-25. It comprises of transducers and simulators along with indicators for airspeed, altitude, engine RPM, vertical speed, horizontal speed, turn and slip angle, roll angle, pitch angle etc.