NTSB Identification: ANC91GAMS1.
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Accident occurred Thursday, October 11, 1990 in Deadhorse, AK
Probable Cause Approval Date: 05/30/2003
Aircraft: Gulfstream Aerospace 690C, registration: N45Q
Injuries: 3 Fatal.

: NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this public aircraft accident report.

The airplane with a certificated airline transport pilot and two passengers aboard departed on a US Department of the Interior, public use flight over the Arctic Ocean. The purpose of the flight was to locate radio collared polar bears. Radar contact with the airplane was lost while it was maneuvering at 22,000 feet msl about 200 miles from shore. The airplane did not reach the intended destination, and neither the airplane nor its occupants were located during an extensive search.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

Missing aircraft.

Full narrative available

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