"The engine must be a turbo-shaft type and should be modular in construction. Life limited modules should be limited to bare minimum. Engine power should be modulated by a dual-channel full authority digital electronic control (FADEC) system suitable for twin engine application with cross talk facility and state of the art digital engine health monitoring and diagnostic system," the document issued by HAL said.
In the technical specification, HAL seeks engine capable of operation without any oil replenishment for 4 hours which should be capable of air starts up to an altitude of 5.5 km.
HAL aims to indigenously develop 12.5-ton class multi-role helicopter with service ceiling of around 20,000 feet, 3,500 kg payload and a seating capacity of 24. Besides the domestic defense orders, HAL will target export orders, aiming to replace the aging fleet of similar class of helicopters that are operational in more than 40 air forces around the world. HAL hopes to have the first flight of the multi-role helicopter in six to seven years. India needs approximately 1,100 helicopters for its armed forces.