The investigation into the Jharkhand plane crash is facing a significant challenge due to the absence of a black box. Two commercial flights had faced adverse weather on the same route earlier, and officials are probing if the crashed aircraft's radar was functioning properly. Aircraft and crewThe aircraft, manufactured in 1987, was carrying a patient, a doctor, a paramedic, two attendants, and two pilots. The last radar contact was at 7.22 pm, when it was at 13,800 feet and around 40 nautical miles from Ranchi and the final radio contact came at 7.34 pm. Communication and radar contact were lost about 100 nautical miles south-east of Varanasi.