However, it appears that the pilot suddenly hit a rough pocket and collided with static obstruction because of loss of visual reference.
We feel the helicopter should be able to have communication with ground." Maximum civil helicopter fatal accidents ( total being 54) in the country from 1999 were because of loss of visual reference in flight, an expert said.
The NTSB concluded that Kennedy became disabled by "pilot's spatial disorientation" (PSD), an inability to sense one's true position due to "complex motions and certain visual scenes encountered under adverse weather conditions." The NTSB notes that "it can take as long as 35 seconds to establish full control by instruments after a loss of visual reference
" to the horizon.