Hindustan Aeronautics Limited (HAL) will hand over two light combat aircraft (LCA Mk-1) trainers to the Indian Air Force on September 18, marking the completion of a contract signed in 2010, people aware of the matter said on Tuesday. The state-run plane maker will also deliver four Dhruv NG helicopters to Pawan Hans the same day, as it sharpens its Focus on the civil aviation business, the people said. The helicopter service provider ordered 10 such multi-role helicopters in January.