Rockwell Grand Commander 690 crash, Dec 31, 1992 (2 killed)
Rockwell Grand Commander 690 accident on December 31, 1992 near Herlong, California, United States with 2 fatalities. Cause: In-flight breakup after an...
- Date: December 31, 1992
- Aircraft: Rockwell Grand Commander 690
- Location: Herlong, California, United States
- Fatalities: 2
- Phase of flight: En route
- Cause: In-flight breakup after an encounter with severe turbulence that exceeded the airframe's design strength.
A Medic Air Grand Commander on an air ambulance flight from Reno to Susanville broke up in flight in the lee of the Sierra Nevada near Herlong, killing the pilot and a flight nurse. Lenticular clouds and reported airspeed swings in the area point to severe mountain-wave turbulence. No pre-flight weather briefing was found in the records.