| 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.