 Further on, 2050 hours of test flight of engines has been taken place so far.27 flights for 55 hours duration have been completed on testbed IL-76 aircraft as well as maximum forward altitude and a maximum forward speed of 0.7 Mach had been recorded.The "Kaveri" program has attracted much criticism due to its ambitious objective, protracted development time, cost overruns, and the DRDO's lack of clarity and openness in admitting problems.