Army says pilots in fatal Hawaii crash were disoriented
By: The Associated Press  
HONOLULU — An Army investigation into a fatal helicopter crash found the pilots became disoriented during nighttime training off Hawaii last year. All five soldiers on board were killed in the Aug. 15, 2017, crash.
The pilots experienced “spatial disorientation,†which is when a pilot can’t determine a current position and altitude relative to the Earth’s surface, the Honolulu Star-Advertiser reported Friday. The newspaper obtained the results of the investigation through a Freedom of Information Act request.
https://www.armytimes.com/news/your-army/2018/09/09/army-says-pilots-in-fatal-hawaii-crash-were-disoriented/