# NTSB NYC07LA201: Sukhoi SU-31, N131BW, Markham, VA, August 23, 2007 - Type: NTSB accident investigation - Classification: Accident · Serious injuries · Limited investigation · Final report - Date: August 23, 2007, 13:30 local (17:30 UTC) - Place: Markham, VA - Coordinates: 38.976943, -77.953056 - Nearby events: https://openairdocs.org/map.md?lat=38.9769&lon=-77.9531&mi=10 - Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping) - Highest injury: Serious injuries - Injuries: 1 serious - Status: Completed, report March 31, 2008 - Report: Approved by Office Director - Parties: FAA/FSDO - NTSB case key (mKey): 66497 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=NYC07LA201 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/66497/pdf - Page: https://openairdocs.org/ntsb/NYC07LA201 ## Probable cause The pilot's failure to maintain aircraft control. Contributing to the accident were a fuel leak as reported by the pilot, the pilot's diverted attention, a low cloud ceiling, and fog. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of control - in flight, cruise - aircraft control - not maintained, pilot in command (cause) - fluid,fuel - leak (contributing factor) - diverted attention, pilot in command (contributing factor) - weather condition - low ceiling (contributing factor) - weather condition - fog (contributing factor) - In flight collision with object, descent - uncontrolled - object - tree(s) ## Analysis The non-instrument-rated pilot reported that he obtained a weather briefing via computer, and departed on a visual flight rules (VFR) cross-country flight. The pilot further stated that approximately 30 minutes after departure, he became disoriented as to his location and altitude, while looking for the source of a fuel leak and searching for a suitable landing area. Witnesses near the accident site reported low ceilings and heavy fog. In addition, weather recorded near the accident site, about the time of the accident, included an overcast ceiling at 1,200 feet and 7 miles visibility. The wreckage was consumed by fire, and a wreckage examination could not be performed, nor a fuel leak identified. ## Factual narrative On August 23, 2007, about 1330 eastern daylight time, a Sukhoi SU-31 experimental airplane, N131BW, was destroyed during impact with terrain and a postcrash fire, near Markham, Virginia. The certificated commercial pilot was seriously injured. Visual meteorological conditions prevailed for the flight that departed Warrenton-Fauquier Airport (W66), Warrenton, Virginia, about 1300; destined for New Garden Airport (N57), Toughkenamon, Pennsylvania. A visual flight rules flight plan was filed for the personal flight conducted under 14 Code of Federal Regulations Part 91. According to the pilot's written statement, the airplane developed a fuel leak during cruise flight, and there was a strong fuel odor in the cockpit. The pilot became disoriented as to his location and altitude, while looking for the source of the fuel leak and searching for a suitable landing area. The pilot did not recall the actual impact. According to a Federal Aviation Administration (FAA) inspector, a nearby witness reported that visibility was low due to clouds. She heard the airplane approach from the south, and then heard it impacting trees before hitting the ground. The FAA inspector further stated that the state police and medivac helicopters could not respond due to the low ceilings, and all-terrain-vehicles were getting lost in the fog near the accident site. The airplane was consumed by fire, and the FAA inspector was unable to perform a wreckage examination or identify a fuel leak. The pilot held a commercial pilot certificate, with a rating for airplane single engine land. He did not have an instrument rating. The pilot reported a total flight experience of 5,400 hours; of which, 2,700 hours were in the same make and model as the accident airplane. The pilot did not report any simulated or actual instrument experience. The pilot also reported that he obtained a weather briefing via computer, and that the weather at the time of the accident, at Winchester Regional Airport (OKV), Winchester, Virginia, included an overcast ceiling at 2,400 feet and 7 miles visibility. Winchester Regional Airport was located about 15 miles northwest of the accident site, at an elevation of 727 feet msl. The reported weather at OKV, at 1320, was: wind calm; visibility 7 miles; overcast ceiling at 1,200 feet; temperature 22 degrees Celsius (C); dew point 20 degrees C; altimeter 30.15 inches of mercury. The elevation near the accident site was approximately 700 feet msl. ## Aircraft - Registration: [N131BW](https://openairdocs.org/deregistered/N131BW-2007-11-09), registration cancelled 2007-11-09, S/N 0501, built 1999 (OpenAirDocs) - Reported make and model: Sukhoi SU-31 - Registry model: [Sukhoi SU-31](https://openairdocs.org/model/sukhoi-su-31) (registry code 9850105) (OpenAirDocs) - Registry engine: [Amateur-built UNKNOWN ENG](https://openairdocs.org/engine/amateur-built-unknown-eng) (registry code 99999) (OpenAirDocs) - Category: Airplane - Serial number: 05-01 - Airframe hours: 380 - Engines: Vendeneyev M14PF 400 horsepower reciprocating - Damage: Destroyed - Fire: On-Ground - Flight: Personal, Part 91 - Registered owner: Sergei A Boriak - Airworthiness certificate: Standard, Aerobatic - Last inspection: Condition, April 1, 2007, 16 hours before - Departed: W66, Warrenton, VA - Destination: N57, Toughkenamon, PA - Flight plan: VFR ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 52; injuries: serious; commercial; airplane ratings: single-engine land; medical: class 2, with waivers/limitations; last flight review April 1, 2007; seat: single; flight hours: 5,400 total, 2,700 in this make and model, 5,000 as pilot in command, 40 in the last 90 days, 15 in the last 30 days, 0 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: calm - Visibility: 7 statute miles - Lowest ceiling: 1,200 ft overcast - Temperature: 72 °F, dew point 68 °F - Altimeter: 30.14 inHg - Observed at: OKV, 15 nm away ## FAA reports on this event (1) The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs). - [Accident 20070823829569A](https://openairdocs.org/incident/20070823829569A), Aug 23, 2007: Sukhoi SU31, Paris, VA, Destroyed. (-23) Flight was to be from W66 (warrenton, VA) to N57 (new garden airport in toughkenamon, PA). The airman was circling around the dulles class b and adiz… From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.