Casualties unknown

Propeller Strike Injury During Snow Removal (N4818D)

Helena, MT, US

On December 2, 1983, a Cessna 172N (registration N4818D) was involved in an aviation accident near Helena, MT. Investigators recorded the probable cause as: Contact between the propeller and a passenger attempting to remove snow, with conflicting accounts of pilot instructions regarding safety clearance. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive; 1 related events involving the same aircraft type or operator are linked below.

Sourcesthe U.S. National Transportation Safety Board (NTSB) historical archivePrimary reportUpdated 2026-06-20Data APIEditorial standards

A passenger was struck by an aircraft propeller while attempting to clear snow from the surface. Conflicting accounts exist regarding pilot instructions during the incident.

What happened

An aviation incident occurred when an aircraft propeller struck a passenger who was positioned near the engine area. The individual had been attempting to sweep snow off the exterior of the aircraft. Discrepancies emerged between the pilot and the passenger regarding the sequence of events leading to the injury.

The pilot stated that he had explicitly instructed the passenger to remain clear of the aircraft during the operation. Conversely, the passenger reported that the pilot had directed him to remove the snow. The passenger described losing consciousness or memory immediately after the propeller made contact, recalling only holding his arm following the impact.

Findings

The primary causal factor was the propeller strike resulting from proximity to the rotating blades during ground operations. Conflicting testimony regarding safety instructions highlights potential communication failures during pre-flight or post-flight procedures in adverse weather conditions.

Probable cause

Contact between the propeller and a passenger attempting to remove snow, with conflicting accounts of pilot instructions regarding safety clearance.

All Cessna 172 accidents →

Frequently asked questions

What happened in the 2 Dec 1983 Cessna 172N accident near Helena, MT?

A passenger was struck by an aircraft propeller while attempting to clear snow from the surface. Conflicting accounts exist regarding pilot instructions during the incident.

What aircraft was involved and where did it happen?

The accident on 2 Dec 1983 involved a Cessna 172N, registration N4818D, at Helena, MT.

What was the probable cause of the accident?

Contact between the propeller and a passenger attempting to remove snow, with conflicting accounts of pilot instructions regarding safety clearance.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001214X45267. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.