An Indian Air Force (IAF) An-32 military transport plane carrying 29 military personnel to a remote island chain in the Bay of Bengal went missing on Friday, the military said.
The plane was airborne at 8:30am and was supposed to land at 11:30.
The Russian-made AN-32 was on its way to Port Blair, the capital of the Andaman and Nicobar chain of islands, from the southeast city of Chennai when it disappeared from radar.
A navy spokesman said surveillance planes and ships were searching for the aircraft. It was carrying service personnel to the islands near the Malacca Straits, where India has a military base.
Over 100 AN-32 aircraft are currently in service with the IAF.