Casualties unknown

1989-04-19: Cessna 170A (N5414C) — Westphal, Terry R. — Kalispell, MT

Kalispell, MT, US

On April 19, 1989, a Cessna 170A (registration N5414C) operated by Westphal, Terry R. was involved in an aviation accident near Kalispell, MT. Investigators recorded the probable cause as: The pilot's failure to maintain directional control during landing, which resulted in a ground loop and nose-over, due to light and variable wind conditions. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.

Sourcesthe U.S. National Transportation Safety Board (NTSB) historical archivePrimary reportUpdated 1781061362Data APIEditorial standards

The pilot reported the aircraft behaving as if in turbulence during landing. Upon touchdown, directional control was lost, resulting in a ground loop and nose-over despite no mechanical issues.

What happened

During the final approach and landing phase, the pilot reported that the airplane began to exhibit erratic behavior, feeling as though it were encountering turbulence. Upon initial contact with the runway surface, the pilot was unable to maintain directional control of the aircraft. The airplane subsequently ground-looped and came to rest in a nose-over attitude.

The investigation

A post-crash examination of the aircraft's braking systems and related mechanical components was conducted. The inspection revealed no evidence of a mechanical malfunction or failure that would have contributed to the loss of control.

Findings

Meteorological data indicated that the wind conditions at the time of the accident were light and variable. These conditions can significantly impact directional control during landing, particularly for aircraft with tailwheel configurations or those sensitive to crosswind components. The pilot's inability to keep the aircraft moving straight after touchdown suggests a loss of traction or control authority likely exacerbated by the unpredictable wind shifts.

Safety message

Pilots should be aware that light and variable winds can create deceptive landing conditions. Sudden changes in wind direction or speed can cause rapid loss of directional control, especially during the critical phase of rollout. Proper crosswind landing techniques and awareness of wind shear are essential for maintaining control on the ground.

Probable cause

The pilot's failure to maintain directional control during landing, which resulted in a ground loop and nose-over, due to light and variable wind conditions.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001213X28085. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.