Sep 19, 2011
Accident
Substantial Longview, TX
InjuriesNone
Phase of Flight-
ConditionsVMC
OperationFAR 091
Probable Cause
The flight's inadvertent encounter with a rare and unforecasted mesoscale gravity wave while on base leg, which resulted in a sudden loss of altitude and subsequent collision with trees.
NTSB CEN11LA657