Maintenance, Repair and Overhaul (MRO) Subject: Science and Technology Section:  Defence Concept: HAL to provide maintenance and overhaul support for MQ­9B drone engines in India. As India looks to purchase armed Predator Remotely Piloted Aircraft Systems (RPAS) from the U.S., Hindustan Aeronautics Ltd. (HAL) and General Atomics announced at Aero India on Wednesday […]