Following the 2011 Sikkim earthquake , four Dhruvs conducted rescue operations . In October 2011 , Jharkhand 's regional government appealed for Mil Mi-17 helicopters as operations of their Dhruvs had been disrupted by prolonged maintenance delays and a major crash . In October 2011 , The Telegraph reported that a spate of helicopter crashes , including the Dhruv , were alleged to have been caused by low quality maintenance work performed by Pawan Hans Helicopters Ltd . In February 2012 , the Home Ministry reported that the Dhruv remained grounded and that other helicopters such as the Mi-17 were being wet-leased in its place and that in the long term the Dhruv fleet is to be replaced
2011 Sikkim earthquake
2011 Sikkim earthquake
HAL Dhruv