The national transportation safety board (ntsb), which has been on the ground since friday, says itll take several days — or potentially weeks — to collect and analyze evidence from the sprawling crash site. · heres what we know so far about the medical jet that crashed in northeast philadelphia , killing all six people on board as well as a person in a car. Juan browne, a commercial pilot and aviation accident expert , tells axios spatial disorientation is more common at night when pilots are reliant on their instruments to help them fly. · officials have confirmed a total of seven people have died and 19 are injured after a jet rescue ambulance plane crashed in northeast philly friday night. 31 crash near roosevelt mall in the city. · a key piece of hardware that experts had said could solve the mystery in the fatal crash of the medical transport learjet that crashed into a northeast philadelphia neighborhood on jan. · the big picture: · in the moments before a medical jet plunged into a northeast philadelphia street, air traffic controllers received no distress calls from the flight crew, according to a preliminary report released thursday on the fatal jan. · a black box from the medical jet that crashed in northeast philadelphia has been found, sources told action news on sunday. 31, killing seven people and injuring dozens more, turned out to be useless.