The two pilots of the helicopter were safe while both the pilots of the Sukhoi frontline jet ejected before the plane crashed.
The IAF headquarters has ordered separate Court of Inquiry (CoI) into both the incidents.
IAF sources said the engine of the Chetak helicopter had failed some time after it took off from the Central Air Command headquarters at Bamrauli forcing the pilots to go for a force landing. The chopper crash landed and toppled at a field in Kaushambi around 7:15 AM.
Three three villagers were injured in the crash near Shivkar village around 2 PM. Both the pilots ejected safely.
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Yesterday, Minister of State for Defence Subhash Bhamre, in a written reply, had informed Rajya Sabha that 22 fighter aircraft of IAF have crashed since 2013-14 and human error and technical defects were the main reasons for the accidents.
The injured in the Sukhoi crash were identified as Narayan Ram, his daughter-in-law Dalluram and 14-year old-grandson Hanumanram. Their condition is stated to be stable, according to a police official. Some thatched houses were damaged in the incident.
About the Chetak accident, Defence PRO Group Captain, B B Pande, said, "Shortly after take off, the helicopter developed a technical failure following which the pilots tried to land it in the fields. The land was uneven and the helicopter toppled while landing.