Pilot error caused the chopper crash that led to Chief of Defence Staff General Bipin Rawat's death last month, according to preliminary findings of the inquiry team investigating the matter.
"The accident was a result of entry into clouds due to an unexpected change in weather conditions in the valley. This led to spatial disorientation of the pilot resulting in a Controlled Flight Into Terrain (CFIT)," the team found after analysing the Flight Data Recorder and Cockpit Voice Recorder besides questioning all available witnesses to determine the most probable cause of the accident.
According to the IATA (International Air Transport Association), the term refers to accidents in which in-flight collisions with terrain, water, or another obstacle occur without indication of loss of control.
The United States Federal Aviation Administration says CFIT is ''...an unintentional collision with terrain (ground, mountain, body of water, or an obstacle) while an aircraft is under positive control."
The critical distinction in such incidents is the fact the aircraft is under the control of the flight crew.