Event Details

Title:Loss of control on takeoff, Ryan International Airlines DC-9-15, N565PC, Cleveland-Hopkins International Airport, Cleveland, Ohio, February 17, 1991
Micro summary:This Douglas DC-9-10 stalled and crashed on takeoff.
Event Time:1991-02-17 at 0019 EST
File Name:1991-02-17-US.pdf
Publishing Agency:National Transportation Safety Board (NTSB)
Publishing Country:USA
Report number:NTSB-AAR-91-09
Site of event:Cleveland-Hopkins International Airport
Latitude/Longitude:N4124.3' W8151.5'
Departure:Cleveland Hopkins International Airport, Cleveland, Ohio, USA
Destination:Indianapolis International Airport, Indianapolis, Indiana, USA
Airplane Type(s):Douglas DC-9-15
Flight Phase:Takeoff
Operator(s):Ryan International Airlines
Type of flight:Cargo
Serious Injuries:0
Other Injuries:0
Executive Summary:About 0019, Sunday, February 17, 1991, Ryan International Airlines flight 590 (Ryan 590), a DC-9 series 10 airplane, crashed while taking off from Cleveland-Hopkins International Airport. The fl ightcrew consisted of two pilots. There were no other crewmembers or passengers on the flight, which was contracted to carry mail for the U.S. Postal Service. Both pilots were fatally injured, and the airplane was destroyed as a result of the accident.

The National Transportation Safety Board determines that the probable cause of this accident was the failure of the flightcrew to detect and remove ice contamination on the airplane's wings, which was largely a result of a lack of appropriate response by the Federal Aviation Administration, Douglas Aircraft Company, and Ryan International Airlines to the known critical effect that a minute amount of contamination has on the stall characteristics of the DC-9 series 10 airplane. The ice contamination led to wing stall and loss of control during the attempted takeoff.

The safety issues discussed in this report include the dissemination of information regarding precautions to be taken when operating in conditions conducive to airframe ice and the particular susceptibility of DC-9 series 10 airplanes to control problems during take off when a minute amount of ice is on the wing.
Learning Keywords:Operations - Icing
Operations - Uncontrolled Flight into Terrain
Operations - Upset in-flight (extreme attitudes, stall, spin)
Other - Certification
Other - Regulatory Oversight
Consequence - Hull Loss


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