NTSB Identification: SEA92FA113
Accident occurred Thursday, May 21, 1992 in ST. IGNATIUS, MT
Probable Cause Approval Date: 09/14/1993
Aircraft: CESSNA 177B, registration: N30922
Injuries: 4 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.

THE ACCIDENT SITE WAS LOCATED AT THE 7500 FOOT LEVEL OF MOUNTAINOUS TERRAIN IN A DRAW WHICH SLOPED UPHILL AT A GRADIENT OF +15 DEGREES TO THE WEST. ON SITE EXAMINATION INDICATED THAT THE AIRCRAFT IMPACTED THE GROUND IN A NEAR VERTICAL ATTITUDE WITH THE WRECKAGE COMING TO REST APPROXIMATELY 45 FEET EAST-SOUTHEAST AND DOWNSLOPE OF THE IMPACT SITE. THERE WAS NO EVIDENCE OF POWERPLANT NOR CONTROL MALFUNCTION. A REVIEW OF THE PILOT'S LOGBOOK REVEALED NO PREVIOUS FLIGHT EXPERIENCE WITHIN THE STATE OF MONTANA NOR ANY DOCUMENTED MOUNTAIN FLIGHT EXPERIENCE.

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

THE PILOT IN COMMAND'S INADVERTENTLY ALLOWING THE AIRCRAFT TO ENTER INTO A STALL/SPIN. FACTORS CONTRIBUTING TO THE ACCIDENT WERE: TERRAIN CONDITION, RISING TERRAIN, AND THE PILOT IN COMMAND'S LACK OF FAMILIARITY WITH THE GEOGRAPHIC AREA.

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