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N139DK accident description

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Tail numberN139DK
Accident dateSeptember 13, 2007
Aircraft typeAero Vodochody L-39C
LocationReno, NV
Near 39.664167 N, -119.883889 W
Additional details: None

NTSB description

HISTORY OF FLIGHT

On September 13, 2007, at 1445 Pacific daylight time, an Aero Vodochody L-39C, N139DK, collided with terrain while participating in the Reno Air Races at Reno-Stead Airport, Reno, Nevada. The pilot was operating the privately owned airplane under the provisions of 14 CFR Part 91. The private pilot, the sole occupant, was killed; the airplane was substantially damaged. Visual meteorological conditions prevailed and no flight plan was filed. The airplane departed Reno-Stead about 1410.

The pilot was participating in the jet race of the Reno Air Races. The accident airplane had rounded the last pylon, pylon 8, when according to a witness, the airplane was banked to the left as it rounded the pylon. The airplane then rolled to the right and impacted the ground at a high speed.

An additional witness reported that the accident airplane was following another airplane. As the airplanes rounded the pylon, the accident airplane appeared to be lower. The accident airplane then seemed to roll inverted and impacted the ground moments later.

In an interview with the Jet Class Director of Flight Operations, he indicated that the pilot had discussed a passing procedure that was inconsistent with race rules. After the pilot spoke with the Director of Flight Operations, the pilot agreed not to perform the passing procedure. According to the Director of Flight Operations, the pilot flew the race in accordance with the Jet Class rules. The Director of Flight Operations was flying above the race at the time of the accident, and also viewed a video of the event following the accident. Based on his experience, it appeared that the pilot may have inadvertently entered the wake turbulence from the T-2B Buckeye and was unable to regain control of the airplane prior to its impact with the ground. Additionally, the Director of Flight Operations indicated that all pilots are given training in wake turbulence avoidance procedures during the Reno Pylon Racing Seminar.

PILOT INFORMATION

The 47 year old pilot held a private pilot certificate with an instrument rating and was certified to fly single engine land and sea airplanes. The pilot had about 1,500 hours total time, with 150 hours in the accident airplane. He had flown the accident airplane about 15 hours within the last 90 days.

The pilot attended the Reno Pylon Racing Seminar in 2006, and he had competed in the jet races in 2006 and 2007. According to the check pilot, the pilot flew well during the racing seminar and no problems were noted.

AIRPLANE INFORMATION

The airplane was issued an experimental Special Airworthiness Certificate on February 8, 2006, for exhibition. A Ukrainian Progress A1-25TL engine powered the airplane. The last inspection of the airplane was on July 11, 2007, at a total time of 961.1 hours. According to the maintenance personnel that worked on the airplane, an additional 15 hours had accrued on the airplane since the inspection.

WRECKAGE AND IMPACT INFORMATION

The wreckage debris field ran generally parallel to runway 8/26 at Reno-Stead and was approximately 705 yards in length. The first identified point of contact consisted of two distinct shapes; one was a large disruption to the soil and spanned outward to the remainder of the debris field and to its left was a mark in the soft soil, rectangular and similar in size and shape to the leading edge of a wing. There was no similar rectangular shape on the right side of the large disruption. The debris field was on a magnetic heading of 240 degrees. Approximately 100 yards into the debris field, the smell of fuel was evident and areas of burn were present.

From the initial soil disruption, the debris field consisted of many small pieces of debris, with multiple large sections. All control surfaces, or portions of them, were identified in the debris field. The engine was separated from the airframe structure during the accident sequence and was the last identified piece of debris within the field. The outer case had been torn from the engine and located by investigators earlier in the debris field. The turbine blades were bent opposite the direction of rotation and portions of the blade tip material were missing.

ADDITIONAL INFORMATION

Videos were obtained from spectators of the Reno Air Races and viewed. The videos showed that a Rockwell T-2B (Buckeye) airplane was leading the group, with the accident airplane behind him. When they rounded pylon 8, the accident airplane was behind the Buckeye. As the accident airplane rounded the pylon, it banked to the left, and then banked to the right. The bank to the right continued through an inverted position as the airplane descended. Upon impact with the ground, the airplane was upright, in a nose low attitude.

According to the Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25), "All aircraft generate a wake while in flight. This disturbance is caused by a pair of counter-rotating vortices trailing from the wingtips. The vortices from larger aircraft pose problems to encountering aircraft. The wake of these aircraft can impose rolling moments exceeding the roll-control authority of the encountering aircraft."

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