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Aviation Accident

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NTSB Identification: CEN16LA281
14 CFR Part 91: General Aviation
Accident occurred Friday, July 22, 2016 in Springfield, OH
Probable Cause Approval Date: 09/06/2017
Aircraft: VANS RV9, registration: N807LK
Injuries: 2 Fatal.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

Before takeoff on a personal cross-country flight, the private pilot received two official weather briefings of all the forecast and observed weather conditions along the flight route, which included thunderstorms and convective SIGMETs. A review of air traffic control (ATC) information revealed that, while en route to the destination airport, the pilot was in contact with ATC and attempting to circumnavigate oncoming weather and precipitation. The pilot requested ATC assistance and stated that he could avoid the clouds if ATC could help him avoid the precipitation, indicating that he was aware of the weather conditions but that he likely did not have onboard weather information. The Middletown sector approach controller provided two route options: one of the options would have allowed the pilot to completely avoid the precipitation and taken him farther away from his destination, and the other option would have allowed the pilot to proceed between two areas of precipitation and stay closer to his intended route. The controller obtained PIREPs from two pilots who had previously transitioned through the two areas of precipitation, and they reported that they “didn’t really have any problems” flying through the area. The controller also provided the pilot the intensity of the two cells and the estimated distance between the two areas of precipitation. After the controller relayed this information to the pilot, he chose to fly between the two areas of heavy precipitation. The controller then transferred communication to the Urbana sector approach controller.
After the pilot checked in with the Urbana approach controller, the controller issued the pilot several heading suggestions to the northwest to avoid the precipitation, but the pilot responded that he wanted to continue on his present heading and then continued flying east toward the severe weather. Despite several subsequent suggestions by the controller to the pilot to change course to avoid the weather, according to radar data, the airplane continued flying east toward the severe weather. In the final 3.5 minutes of the flight, while flying east, the airplane made a left 360° turn while descending about 2,900 ft per minute (fpm), then resumed a climb while heading east. Less than 1 minute later, the airplane made a right 310° turn while descending about 1,200 fpm. The airplane then flew northeast and descended about 4,600 fpm to 3,440 ft above ground level. Subsequently, the descent rate increased to about 6,450 fpm, at which point radar contact was lost. The airplane entered an area of an outflow boundary and thunderstorms and likely encountered heavy precipitation, severe-to-extreme turbulence, updrafts and downdrafts, and wind shear.
A witness saw the airplane in a steep descent and heard the engine operating; the airplane then disappeared behind a tree line, at which point she heard the sound of an impact. The airplane impacted a corn field heading north. The vertical stabilizer and rudder were found 0.61 to 0.63 nautical miles southwest of the main wreckage, respectively, and exhibited overload signatures consistent with an in-flight breakup. A postaccident examination of the airframe and engine did not reveal any anomalies, other than the separated components, that would have precluded normal operation.
Although the Middletown sector controller provided general information about the observed weather, she did not provide specific information, such as the direction relative to the airplane and distance to the bands of weather and the widths of the weather bands, as required by Federal Aviation Administration Order 7110.65. The controller’s workload did not prevent her from providing general weather information and suggesting headings to the pilot, which indicates that the controller could have provided more specific adverse weather information without detriment to other duties, as required. However, it is unlikely that this affected the pilot’s decision about the route he flew. The pilot’s continued flight into known thunderstorms resulted in the in-flight breakup of the airplane.
Although toxicology testing detected ethanol in the pilot’s muscle and liver, the ratio of the detected ethanol suggested that some or all the ethanol was from sources other than ingestion.

The National Transportation Safety Board determines the probable cause(s) of this accident as follows:
  • The pilot’s decision to fly into known thunderstorms, which resulted in an in-flight breakup.