Date: May 30, 1972
Time: 06:24
Location: Dallas/Ft. Worth, Texas
Operator: Delta Air Lines
Flight #: 9570
Route: Training
AC Type: McDonnell Douglas DC-9-14
Registration: N3305L
cn / ln: 45700
Aboard: 4   (passengers:0  crew:4)
Fatalities: 4   (passengers:0  crew:4)
Ground: 0
Summary: While practicing touch and go landing the aircraft crashed after getting caught in the wake turbulence of a DC-10. An encounter with a trailing vortex generated by a preceding "heavy" jet which resulted in an involuntary loss of control of the airplane during final approach. Although cautioned to expect turbulence the crew did not have sufficient information to evaluate accurately the hazard or the possible location of the vortex. Existing FAA procedures for controlling VFR flight did not provide the same protection from a vortex encounter as was provided to flights being given radar vectors in either IFR or VFR conditions.

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