No fatalities

Pilot Takes Off Downhill with Tailwind from Grass Airstrip, Strikes Trees (N8649U)

Marietta, OK, US

On June 21, 2006, a Cessna 172F (registration N8649U) was involved in an aviation accident near Marietta, OK. No fatalities were reported. Investigators recorded the probable cause as: The pilot's improper weather evaluation. Contributing factors were the strong tailwind and the high density altitude. 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 private pilot with 289 hours took off downhill from a 2,450-foot grass airstrip with a known 15-knot tailwind. The aircraft's airspeed dropped to about 40 mph at treetop level, and it struck trees after attempting to turn into the wind. The pilot was seriously injured; the passenger sustained minor injuries.

Accident Details

The private pilot, who had accumulated 289 total flight hours, elected to take off from runway 35 at a grass airstrip measuring 2,450 feet long and 55 feet wide, with a downhill slope. The pilot was aware of a 15-knot tailwind. According to the pilot's statement on the NTSB Form 6120.1, he had previously departed from the same airport a few times under similar weather conditions.

Flight and Maneuvering

The pilot, who reported 200 hours in the same make and model aircraft, configured the airplane for takeoff with 20 degrees of flaps due to the rough grass surface. The takeoff and initial climb were described as normal until the aircraft reached treetop level. At that point, the airspeed dropped to approximately 40 miles per hour, and the aircraft ceased climbing. The pilot realized he would not clear the trees and attempted to maneuver the airplane into the wind. He stated, "we got boxed into a corner and wound up hitting some trees on the northwest side of the field." A large tree trunk impaled the windshield, and the airplane came to rest in a nose-down, inverted position. There was no post-crash fire.

Injuries and Egress

The pilot received serious injuries, and his passenger sustained minor injuries. Both occupants were able to exit the single-engine airplane through the broken windscreen without assistance.

Weather and Conditions

The nearest weather reporting station, located 15 nautical miles south of the accident site, reported wind from 160 degrees at 14 knots, gusting to 22 knots, with clear skies and a temperature of 32 degrees Celsius. The Investigator-in-Charge calculated the density altitude at 2,928 feet.

Pilot Comments

The pilot reported that he had been taught that on runways with a very steep hill (slope), the pilot should always land uphill and take off downhill, regardless of wind direction.

Frequently asked questions

What happened in the 21 Jun 2006 Cessna 172F accident near Marietta, OK?

A private pilot with 289 hours took off downhill from a 2,450-foot grass airstrip with a known 15-knot tailwind. The aircraft's airspeed dropped to about 40 mph at treetop level, and it struck trees after attempting to turn into the wind. The pilot was seriously injured; the passenger sustained minor injuries.

Were there any fatalities in the 21 Jun 2006 Cessna 172F accident?

No fatalities were recorded in this accident.

What aircraft was involved and where did it happen?

The accident on 21 Jun 2006 involved a Cessna 172F, registration N8649U, at Marietta, OK.

What was the probable cause of the accident?

The pilot's improper weather evaluation. Contributing factors were the strong tailwind and the high density altitude.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20060713X00935. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.