Casualties unknown

Pilot Reports Engine Faltering During Landing After EGT Exceeds Limit (N6697X)

Palm Harbor, FL, US

On May 25, 1990, a Cessna 210A (registration N6697X) operated by Heinz, Charles D. was involved in an aviation accident near Palm Harbor, FL. Investigators recorded the probable cause as: THE IMPROPER LEANING OF THE FUEL/AIR MIXTURE RESULTING IN THE LOSS OF ENGINE POWER DUE TO EXCESSIVE INTERNAL ENGINE TEMPERATURE. 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

During a normal cruise flight, the pilot leaned the mixture. While returning to land, the EGT gauge exceeded the red line, and the engine faltered. Despite corrective actions, a forced landing in a field resulted in substantial damage.

Accident Details

According to the pilot, the flight departed following a normal engine run-up with the cowl flaps open. During normal cruise flight, the pilot leaned the mixture to 50 degrees rich of peak. While returning to land, the pilot observed the exhaust gas temperature (EGT) gauge indicate past the maximum red line limit. The pilot further stated that the engine began "faltering."

Pilot Actions

In response, the pilot pushed the mixture to full rich, repositioned the fuel selector, turned the electric boost pump switch to high, and repositioned the magneto switch from both to left, right, and then back to both, all with negative results. The forced landing was executed in a field, after which the aircraft sustained substantial damage.

Post-Accident Examination

During a post-accident engine run, the engine operated normally. Each magneto was correctly timed. The position of the cowl flaps at the time of departure and prior to the engine failure could not be verified.

Frequently asked questions

What happened in the 25 May 1990 Cessna 210A accident near Palm Harbor, FL?

During a normal cruise flight, the pilot leaned the mixture. While returning to land, the EGT gauge exceeded the red line, and the engine faltered. Despite corrective actions, a forced landing in a field resulted in substantial damage.

What aircraft was involved and where did it happen?

The accident on 25 May 1990 involved a Cessna 210A, registration N6697X, operated by Heinz, Charles D., at Palm Harbor, FL.

What was the probable cause of the accident?

THE IMPROPER LEANING OF THE FUEL/AIR MIXTURE RESULTING IN THE LOSS OF ENGINE POWER DUE TO EXCESSIVE INTERNAL ENGINE TEMPERATURE.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001212X23222. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.