NEW DELHI, April 2 -- The military's Dhruv advanced light helicopter (ALH) fleet, which was grounded nearly three months ago following a fatal crash in Gujarat, will stay out of action for at least three more months with investigators struggling to determine the root cause of the accident in which two Indian Coast Guard pilots and an aircrew diver were killed, officials aware of the matter said on Tuesday.
Hindustan Aeronautics Limited (HAL), which has designed and developed the ALH, has broadened the scope of the ongoing investigation by involving the Indian Institute of Science (IISc) to perform fatigue testing of a critical part in the twin-engine helicopter's transmission system to get to the bottom of the matter, the officials said, a...