| Crash location | 41.316670°N, 76.550000°W |
| Nearest city | Sonestown, PA
41.353691°N, 76.554116°W 2.6 miles away |
| Tail number | N891GM |
|---|---|
| Accident date | 26 Jan 1991 |
| Aircraft type | Helicopter(AF) Mbb Bk 117 B-1(NTSB) |
| Additional details: | White/Green/Silver |
THE PILOT'S INADEQUATE PREFLIGHT PLANNING TO ASSURE THAT THE INTENDED COURSE AND ALTITUDE PROVIDED ADEQUATE TERRAIN CLEARANCE. CONTRIBUTING FACTOR(S) WAS: THE DARK NIGHT, SNOW AND MOUNTAINOUS TERRAIN.