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N113SH accident description

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Tail numberN113SH
Accident dateMarch 04, 2008
Aircraft typeCessna 500
LocationOklahoma City, OK
Near 35.472223 N, -97.667223 W
Additional details: None

NTSB description

On March 4, 2008, about 1515 central standard time (CST), a twin-engine Cessna 500 airplane, N113SH, was destroyed upon impact with terrain following a loss of control shortly after takeoff from the Wiley Post Airport (PWA), located in Oklahoma City, Oklahoma. The airline transport pilot (ATP), instrument rated commercial pilot, and the three passengers sustained fatal injuries. The airplane was registered to and operated by Southwest Orthopedic and Sport Medicine Clinic of Oklahoma City, Oklahoma. Visual meteorological conditions prevailed and an instrument flight rules (IFR) flight plan was filed for the flight. The 549-nautical mile cross-country flight originated from PWA about 1513 and was destined for the Mankato Regional Airport (MKT), Mankato, Minnesota.

Investigators gathered information from approximately 10 witnesses to the accident.

One witness, who had served 20-years as an Air Force Crew Chief, was standing in the southwest parking lot at Lake Overholser when he first heard the accident airplane in the air above and behind him. The witness reported hearing a sound that resembled an "engine compressor stall." Turning around he observed the airplane descending at a 60 to 70 degree nose down attitude. The witness stated that as the airplane descended, he observed gray smoke trailing from what appeared to be the right engine. Moments later the airplane impacted the ground and a "huge fireball" erupted. The witness further reported that around the time of the fireball he observed pieces of a bird falling from the sky to the water near his location. He described the pieces as being white in color.

A second witness was standing on the west end of the bridge (dam) over Lake Overholser when he heard a jet airplane. As the airplane passed overhead he heard a noise resembling a "sonic boom at 30,000 feet only not as loud." Looking up, he observed the airplane in level flight with smoke trailing from its "far side engine." (The witness indicated with an airplane model that it was the left engine.) The airplane then banked to the right and descending to the ground. The witness reported that before the impact he could see the top of the airplane's fuselage.

Of the other witnesses, six of them reported observing smoke trail the airplane as it descended. Three of them also described hearing a noise coming from the airborne airplane that they described as a high pitch grinding, screech, or a squeal. Six of the witnesses described the airplane's descent as either a spiral, spin, or a barrel roll.

A security camera at the power company located approximately one half mile southwest from the accident site recorded the accident airplane as it descended to the ground. A review of the footage revealed that the airplane descended to the ground while in a near vertical position. A smoke contrail could be observed trailing the airplane.

A review of preliminary radar information revealed that the airplane had climbed to an altitude of 3,100 feet while on a southwesterly heading. While in the airspace near the Lake Overholser dam the airplane started a steep descent. The airplane impacted the ground approximately one mile south of the dam. There were no reported radio calls of distress from the flight crew.

The wreckage was located in a wooded area approximately four miles south of PWA. The Global Positioning System (GPS) coordinates recorded at the accident site were 35 degrees 28.33 minutes North latitude and 097 degrees 40.03 minutes West longitude, at a field elevation of approximately 1,210 feet mean sea level (msl). The debris field encompassed an area approximately 300 feet long and approximately 50 feet wide, on a magnetic heading of 195 degrees. All major components of the airplane were accounted for at the site.

At 1519, the automated weather observing system at the Wiley Post Airport (PWA), located 4 nautical miles north from the site of the accident, reported wind from 150 degrees at 9 knots, 10 statute miles visibility, clear of clouds, temperature 52 degrees Fahrenheit, dew point 16 degrees Fahrenheit, and a barometric pressure setting of 29.86 inches of Mercury.

The airplane wreckage was recovered for further examination of the engines and portions of the airframe, and residue was removed from the horizontal and vertical stabilizer and sent to an ornithologist at the Smithsonian Institute for examination.

The airplane was equipped with a cockpit voice recorder (CVR) which was examined by personnel from the NTSB Recorders Laboratory located in Washington, D.C. The examination revealed that the CVR was not operating during the accident flight.

(c) 2009-2011 Lee C. Baker. For informational purposes only.