No fatalities

Ground Accident After Hand-Propeller Start Attempt (N7493X)

Zephyrhills, FL, US

On November 21, 2004, a Cessna 172B (registration N7493X) was involved in an aviation accident near Zephyrhills, FL. No fatalities were reported. Investigators recorded the probable cause as: The pilot's failure to set the parking brake and his improper starting procedure which resulted in an unattended aircraft running away after hand starting the engine and the airplane colliding with parked airplanes, incurring substantial damage. 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 2026-07-04Data APIEditorial standards

A pilot reported that after refueling and unsuccessful hand-starting attempts, an engine unexpectedly started, causing the airplane to roll forward, knock the pilot down, and collide with two parked airplanes and fences.

Incident Overview

A pilot recounted an accident that occurred after refueling an airplane. The pilot stated that after refueling, he boarded the aircraft and attempted to start the engine, but it would not start. He then turned off the magneto switch, set the brakes, and exited the airplane. He attempted to start the engine by hand several times, without success. After a brief distraction, he again moved the propeller, at which point the engine suddenly started operating immediately.

Sequence of Events

The airplane began moving forward, heading toward a fuel tank. The pilot ran after it and grabbed the left strut in an effort to prevent a collision with the tank. The airplane then proceeded between the fuel tank and a credit card machine, knocking the pilot to the ground. The aircraft continued onward, impacting two parked airplanes and two chain-link fences before coming to a stop.

Investigation Findings

The investigation did not specify a probable cause for the accident. The pilot's actions and the circumstances leading to the unintended engine start were documented, but no causal factors were identified in the available source material.

Frequently asked questions

What happened in the 21 Nov 2004 Cessna 172B accident near Zephyrhills, FL?

A pilot reported that after refueling and unsuccessful hand-starting attempts, an engine unexpectedly started, causing the airplane to roll forward, knock the pilot down, and collide with two parked airplanes and fences.

Were there any fatalities in the 21 Nov 2004 Cessna 172B accident?

No fatalities were recorded in this accident.

What aircraft was involved and where did it happen?

The accident on 21 Nov 2004 involved a Cessna 172B, registration N7493X, at Zephyrhills, FL.

What was the probable cause of the accident?

The pilot's failure to set the parking brake and his improper starting procedure which resulted in an unattended aircraft running away after hand starting the engine and the airplane colliding with parked airplanes, incurring substantial damage.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20050111X00031. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.