Apr 5, 1988
Accident
Substantial ST. PAUL, MN
InjuriesNone
Phase of Flight-
ConditionsIMC
OperationFAR 135
Probable Cause
MECHANICAL FAILURE AND STICKING OF THE PILOTS THUMB OPERATED TRIM SWITCH CAUSING NOSE DOWN PITCH COMMAND. THE FAILURE OF THE CABIN HEATER AND THE LOW CABIN TEMPERATURE ARE CONTRIBUTING FACTORS.
NTSB CHI88FA091