The air force said an inquiry has been ordered into the accident.
In 2015, Rawat had survived a different helicopter crash in the state of Nagaland located in northeast India.
A helicopter carrying him, his wife and several top military officials crashed in the hills of south India, killing 13 people on board, including the top official, the country's air force said.
New Delhi is looking to increase its military effectiveness in the face of heightened tensions with China after deadly clashes in a disputed Himalayan region, as well as its longstanding conflict with neighbouring Pakistan.
Singh is expected to make a statement in the Lok Sabha at around 11.
Associated Press writer Munir Ahmed in Islamabad, Pakistan, contributed to this report.
He previously served as chief of army staff and also commanded forces in Indian-controlled Kashmir and along the frontier with China.
Fourteen people died in a crash last month when an Azerbaijani military Mi-17 went down during a training flight.