On June 27, 1983, a Cessna T188C (registration N9639J) was involved in an aviation accident near Marshall, MO. Investigators recorded the probable cause as: Fatigue fracture of the crankshaft at the #3 main bearing journal. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
An aircraft experienced an engine failure while en route to spray, jettisoned its load, and subsequently impacted trees in a wooded pasture. Metallurgical analysis revealed a fatigue fracture of the crankshaft.
Incident Summary
An agricultural aircraft experienced an engine failure while en route to a spraying operation. The aircraft was observed to jettison its load before impacting trees in a wooded pasture. No further details about the operation or pilot actions were provided in the source.
Metallurgical Examination Findings
A metallurgical examination of the engine revealed that the crankshaft, part number 631716, had fractured due to fatigue progression. The fatigue crack propagated through the forward cheek of the #3 main bearing journal. Initiation of the fatigue crack occurred at a location 0.047 inches below the forward radius surface. No metallurgical abnormalities were detected at the origin site of the fracture.
Probable cause
Fatigue fracture of the crankshaft at the #3 main bearing journal.
Frequently asked questions
What happened in the 27 Jun 1983 Cessna T188C accident near Marshall, MO?
An aircraft experienced an engine failure while en route to spray, jettisoned its load, and subsequently impacted trees in a wooded pasture. Metallurgical analysis revealed a fatigue fracture of the crankshaft.
What aircraft was involved and where did it happen?
The accident on 27 Jun 1983 involved a Cessna T188C, registration N9639J, at Marshall, MO.
What was the probable cause of the accident?
Fatigue fracture of the crankshaft at the #3 main bearing journal.
A SkyWalk Join't 3 paraglider crashed into the ground near Las Vizcachas, Chile, on September 1, 2024. The pilot and passenger sustained serious spinal…
PARAPENTE (ULTRALIVIANO NO MOTORIZADO)·2024-09-01DGAC Chile
A Cessna 172N struck electrical cables while on final approach to land at Aucó Aerodrome in Chile. The pilot was uninjured, but the aircraft sustained damage…
A Bombardier DHC-8-402 suffered a tail strike during landing at Puerto Williams on September 9, 2024. All 76 occupants were unharmed, but the aircraft…
A MYD JS-MD 3 glider veered off the runway and struck a wall at Vitacura Aerodrome on January 6, 2025. The pilot was uninjured, but the aircraft sustained…
A recreational paraglider flight in Puchuncaví, Chile, ended with the pilot sustaining serious injuries after a rapid descent and impact with a hillside on…
PARAPENTE (ULTRALIVIANO NO MOTORIZADO)·2025-03-29DGAC Chile
A Tecnam P2006T landed on its belly at an aerodrome in Poland after the crew failed to confirm landing gear deployment. The incident resulted in no injuries…