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Last updated: 27 October 2021
Datum:Sonntag 5 März 1967
Flugzeugtyp:Silhouette image of generic CVLT model; specific model in this crash may look slightly different
Convair CV-580
Fluggesellschaft:Lake Central Airlines
Kennzeichen: N73130
Werknummer: 23
Baujahr: 1952
Triebwerk: 2 Allison 501-D13D
Besatzung:Todesopfer: 3 / Insassen: 3
Fluggäste:Todesopfer: 35 / Insassen: 35
Gesamt:Todesopfer: 38 / Insassen: 38
Sachschaden: Zerstört
Konsequenzen: Written off (damaged beyond repair)
Unfallort:3 km (1.9 Meilen) SE of Marseilles, OH (   USA)
Flugphase: Während des Fluges (ENR)
Betriebsart:Inländischer planmäßiger Passagierflug
Flug von:Columbus-Port Columbus International Airport, OH (CMH/KCMH), USA
Flug nach:Toledo-Express Airport, OH (TOL/KTOL), USA
Flugnummer: 527
Lake Central Airlines Flight 527 departed Chicago, IL for a flight to Detroit, MI with intermediate stops at Lafayette, IN, Cincinnati, OH, Columbus, IN and Toledo, OH. The aircraft arrived at Columbus at 19:35 and took off for Toledo 17 minutes later. About 20:05 the flight was cleared from its assigned cruising altitude of 10,000 feet to descend to 6,000 feet and report leaving 8,000 feet and 7,000 feet. Shortly after commencing the descent, all four prop blades on the no. 2 engines separated. The no. 2 prop blade penetrated the fuselage. While yawing to the right, the fuselage failed along the line of penetrations and the Convair crashed.
When the torque cylinder failed, prop pressure oil was lost, causing the blades to move to low pitch at a rate too rapid for the prop pitch lock to operate effectively. The prop oversped, causing the blades to separate in overstress.

Probable Cause:

PROBABLE CAUSE: "The failure of the right propeller due to the omission of the torque piston nitriding process during manufacture, and the failure of manufacturing quality control to detect the omission."

Accident investigation:
Investigating agency: NTSB
Status: Investigation completed
Duration: 1 years
Accident number: NTSB File 1-0001
Download report: Final report


NTSB issued 3 Safety Recommendations

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This map shows the airport of departure and the intended destination of the flight. The line between the airports does not display the exact flight path.
Distance from Columbus-Port Columbus International Airport, OH to Toledo-Express Airport, OH as the crow flies is 191 km (120 miles).
Accident location: Exact; as reported in the official accident report.

This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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