| Crash location | Unknown | 
| Nearest city | Ryderwood, WA 46.376497°N, 123.043733°W | 
| Tail number | N400N | 
|---|---|
| Accident date | 30 Nov 1990 | 
| Aircraft type | Aero Commander 690A | 
| Additional details: | None | 
THE PILOT'S IMPROPER INFLIGHT PLANNING AND FAILURE TO MAINTAIN PROPER ALTITUDE IN MOUNTAINOUS TERRAIN AT NIGHT.