NTSB Identification: DEN84LA079.
The docket is stored on NTSB microfiche number 24314.
Nonscheduled 14 CFR
Accident occurred Monday, January 30, 1984 in OGDEN, UT
Aircraft: BELL 47G-3B-1, registration: N90769
Injuries: 3 Uninjured.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

THE PLT TOOK OFF FROM A MOUNTAINOUS WORK SITE TO RETURN TO SALT LAKE CITY, UT. THE WX WAS CLEAR AT THE WORK SITE (ELEVATION 6700 FT), BUT THERE WAS FOG BELOW. AFTER ENCOUNTERING THE FOG, THE PLT HOVERED WITH A SLOW FORWARD SPEED OVER SNOW COVERED TERRAIN. A PASSENGER SAID THAT WHERE ROCKS PROTRUDED THRU THE SNOW, THEY PROVIDE A REFERENCE, THEN SUDDENLY THERE WERE NO ROCKS. AS THE HELICOPTER PROCEEDED OVER AN OPEN AREA, THE PLT LOST GROUND RECERENCES. HE SAID HE MAY HAVE EXPERIENCED VERTIGO BECAUSE HE THOUGHT HE WAS ABOUT ON THE GROUND WHEN THE HELICOPTER HIT & ROLLED OVER. THE ELEVATION AT THE CRASH SITE WAS ABOUT 5000 FT.

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

AIRCRAFT HANDLING..NOT MAINTAINED..PILOT IN COMMAND

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

SPATIAL DISORIENTATION..PILOT IN COMMAND

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

VFR FLIGHT INTO IMC..CONTINUED..PILOT IN COMMAND


Contributing Factors

WEATHER CONDITION..FOG


Contributing Factors

WEATHER CONDITION..OBSCURATION


Contributing Factors

TERRAIN CONDITION..SNOW COVERED


Contributing Factors

WEATHER CONDITION..WHITEOUT

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