NTSB Identification: DEN90FA033.
The docket is stored on NTSB microfiche number 41169.
Accident occurred Saturday, December 16, 1989 in CASTLE ROCK, CO
Probable Cause Approval Date: 06/25/1992
Aircraft: BEECH B35-A33, registration: N477T
Injuries: 2 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 aircraft accident report.

A VFR FLIGHT PLAN HAD BEEN FILED BUT, WHILE ENROUTE TO DENVER IT WAS CHANGED TO AN IFR FLIGHT PLAN WHEN THE PILOT REALIZED THE WEATHER HAD DETERIORATED TO INSTRUMENT METEOROLOGICAL CONDITIONS. THE PILOT ACKNOWLEDGED A CLEARANCE FOR AN ILS APPROACH INTO CENTENNIAL AIRPORT, ENGLEWOOD, COLORADO, BUT DURING THE APPROACH HE SAID THAT HE WAS '...ALL TURNED AROUND AND WAS HAVING TROUBLE CONTROLLING THE AIRCRAFT.' THERE WAS NO FURTHER CONTACT WITH THE PILOT AND THE AIRCRAFT FAILED TO ARRIVE AT THE AIRPORT. A SEARCH WAS CONDUCTED AND THE AIRCRAFT WRECKAGE WAS FOUND SHORTLY AFTER DAYBREAK THE FOLLOWING MORNING. RADAR INFORMATION CONFIRMED THAT THE PILOT WAS FLYING IN CIRCLES AND HAD NOT ESTABLISHED HIMSELF ON THE APPROACH.

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

THE PILOT'S LOSS OF CONTROL AS A RESULT OF SPATIAL DISORIENTATION. FACTORS RELATED TO THE ACCIDENT WERE: THE ADVERSE WEATHER CONDITIONS.

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