NEW DELHI, Aug. 14 -- Plane maker Hindustan Aeronautics Limited (HAL) has carried out extensive tests on the Dhruv advanced light helicopters in a maritime setting in an attempt to pinpoint and fix a lingering flaw in helicopters operated by the navy and coast guard that have been grounded for more than seven months following a fatal crash in Gujarat, officials aware of the matter said on Wednesday. The tests, carried out off the Visakhapatnam coast for two weeks, saw the ALH operate from warships in different weather conditions, the officials said, asking not to be named. "HAL has collected a lot of data during these trials. The data is being analysed at the Rotary Wing Research & Design Centre and the findings will be submitted to the def...