On January 19, 1995, a Hughes 369E (registration N4TP) was involved in an aviation accident near Tampa, FL. Investigators recorded the probable cause as: THE PILOT'S FAILURE TO MAINTAIN AIRCRAFT CONTROL AS A RESULT OF BECOMING SPATIALLY DISORIENTED WHILE MANEUVERING. CONTRIBUTING TO THE ACCIDENT WAS THE DARK NIGHT WITH NO VISIBLE HORIZON. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
Police officers observed a helicopter conducting an over-water search for a drowning victim when it began a left descending turn and collided with the water in very dark conditions.
What happened
Law enforcement personnel were monitoring a helicopter operating in the vicinity of a bridge. The aircraft was engaged in an over-water search operation aimed at locating a drowning victim. During this activity, the helicopter initiated a left descending turn. Instead of leveling off or climbing, the aircraft continued its descent until it impacted the water surface.
The environmental conditions at the time were characterized by very low visibility and light winds. The only source of illumination in the area was the lighting emanating from the nearby bridge, providing minimal ambient light for the pilot.