| Crash location | Unknown |
| Nearest city | Grangeville, ID
45.926552°N, 116.122365°W |
| Tail number | N5539X |
|---|---|
| Accident date | 14 Apr 1991 |
| Aircraft type | Aero Commander S-2R |
| Additional details: | None |
THE IMPROPER DECISION BY THE PILOT TO CONTINUE VFR FLIGHT IN IMC WEATHER CONDITIONS IN MOUNTAINOUS TERRAIN, RESULTING IN PILOT DISORIENTATION AND INADVERTENT FLIGHT INTO A BOX CANYON. FACTORS RELATING TO THE ACCIDENT WERE THE RAIN SHOWERS AND LOW CEILING WEATHER CONDITIONS, AND THE BOX CANYON IN MOUNTAINOUS TERRAIN.