MEC&F Expert Engineers : NTSB Prelim Report: On June 2, 2015, a Monnett Sonex SA experimental amateur-built airplane, N123SX, impacted unoccupied vehicles, after departing the Wittman Regional Airport (OSH), Oshkosh, Wisconsin. Both private pilots were fatally injured.

Friday, June 12, 2015

NTSB Prelim Report: On June 2, 2015, a Monnett Sonex SA experimental amateur-built airplane, N123SX, impacted unoccupied vehicles, after departing the Wittman Regional Airport (OSH), Oshkosh, Wisconsin. Both private pilots were fatally injured.

NTSB Identification: CEN15FA249
 

14 CFR Part 91: General Aviation
 

Accident occurred Tuesday, June 02, 2015 in Oshkosh, WI
 

Aircraft: MONNETT JOHN T JR SONEX SA, registration: N123SX
 

Injuries: 2 Fatal.
 

This is preliminary information, subject to change, and may contain errors. Any errors in this report will be corrected when the final report has been completed. NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report. 


On June 2, 2015, about 1520 central daylight time, a Monnett Sonex SA experimental amateur-built airplane, N123SX, impacted unoccupied vehicles, after departing the Wittman Regional Airport (OSH), Oshkosh, Wisconsin. 

Both private pilots were fatally injured. The airplane was substantially damaged. The airplane was registered to and operated by Sonex Aircraft LLC, under the provisions of 14 Code of Federal Regulations Part 91 as a personal flight. 

Visual meteorological conditions prevailed for the flight which operated without a flight plan. The local flight was originating at the time of the accident.

According to OSH tower personnel, the airplane departed runway 9 from the intersection of runway 9 and runway 13. After clearing the airplane for takeoff, the tower controller focused their attention on inbound traffic and did not witness the accident.

The accident site was located 0.25 miles east-northeast of the departure end of runway 9. The airplane came to rest on unoccupied vehicles located on Oshkosh Corporation's property on a general heading of 220 degrees. 


The engine separated from the airplane and was located on the ground in front of the airplane. All major components remained attached to the airplane. The airplane was transported to a secure facility for further examination.