Mumbai - It has become difficult to investigate the Aarey Colony chopper crash case as cockpit voice recorder and flight data recorder were reportedly not available at the time of this accident. The chopper of Aman Aviation had crashed in the jungles of Aarey Colony. The cockpit voice recorder records the conversation between the pilot and the ATC while flight data recorder maintains the record of technical things during the flight. As this chopper was a small one Robinson 44 Astro, there need not be these two devices in it. A team of Aircraft Accident Investigation Board (AAIB) has arrived in the city to investigate this case. The team visited the accident spot and also visited the Seven Hill Hospital and met Sanjiv Sankar who received injuries in this tragic mishap.