# NTSB CHI96LA279: Schleicher ASK-13, N11EK, Thompsonville, MI, August 4, 1996 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: August 4, 1996, 15:30 local (19:30 UTC) - Place: Thompsonville, MI - Coordinates: 44.520629, -85.930335 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=44.5206&lon=-85.9303&mi=10 - Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report March 31, 1998 - Report: Approved by Office Director - NTSB case key (mKey): 10346 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI96LA279 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/10346/pdf - Page: https://openairdocs.org/ntsb/CHI96LA279 ## Probable cause an evasive maneuver necessitated by the tow plane's aborted takeoff. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - In flight collision with object, takeoff - aborted - evasive maneuver - performed, pilot in command (cause) - object - tree(s) ## Analysis The pilot said that 'just after the tow plane rotated for takeoff, the pilot (of the tow plane) pulled power. The glider quickly gained on the tow plane.' The pilot did not believe that he could land behind the tow plane. 'I released (the tow cable) and turned to the right over an open field of tall weeds. I leveled off (and) made a course correction which realigned me with the runway. (I) used the altitude we had to gain as much airspeed as possible and flew across the weed field until finally settling into the tall weeds. The horizontal plane surface and the left wing were struck by rotten stumps hidden by the weeds.' The tow plane pilot said that the airplane was not developing full power and he decided to abort the takeoff. Examination of the tow plane revealed no anomalies. ## Factual narrative On August 4, 1996, at 1530 eastern standard time (est), a Schleicher ASK-13, N11EK, operated by a commercial pilot, sustained substantial damage when during an aborted takeoff, the glider's wing struck a tree stump. Visual meteorological conditions prevailed at the time of the accident. The personal flight was being conducted under 14 CFR Part 91. No flight plan was on file. The pilot reported no injuries. The local flight originated at Thompsonville, Michigan at 1530 edt. In his written statement, the pilot said that "just after the tow plane rotated for takeoff, the pilot (of the tow plane) pulled power. The glider quickly gained on the tow plane. I saw the right main gear of the tow plane hit the ground near the right edge of the runway." The pilot did not believe that he could land behind the tow plane. "I released (the tow cable) and turned to the right over an open field of tall weeds. I leveled off (and) made a course correction which realigned me with the runway. (I) used the altitude we had to gain as much airspeed as possible and flew across the weed field until finally settling into the tall weeds. The horizontal plane surface and the left wing were struck by rotten stumps hidden by the weeds." A Federal Aviation Administration (FAA) inspector examined the wreckage at the site. The leading edge of the left wing and the left wing spar were broken. The wood-construction horizontal stabilizer, vertical stabilizer and elevator were broken off. Flight control continuity was confirmed. No other anomalies were found with the glider. The tow plane pilot said that the airplane was not developing full power and decided to abort the takeoff. The FAA inspector examined the Cessna-Vansant 305A tow plane, N54517, at the Thompsonville Airport. Examination of the airplane revealed no anomalies. ## Aircraft - Registration: [N11EK](https://openairdocs.org/aircraft/N11EK), registered now, S/N 13401, built 1972 (OpenAirDocs) - Reported make and model: Schleicher ASK-13 - Registry model: [Schleicher AS-K13](https://openairdocs.org/model/schleicher-as-k13) (registry code 38015GS) (OpenAirDocs) - Registry engine: [NONE](https://openairdocs.org/engine/none) (registry code 00000, none) (OpenAirDocs) - Category: Glider - Serial number: 13401 - Airframe hours: 1612 - Engines: unknown - Damage: Substantial damage - Flight: Personal, Part 91 - Registered owner: Northwest Soaring Club - Last inspection: Annual, May 24, 1996, 70 hours before - Departed: 7Y2 - Destination: 3D4, FRANKFORT, MI - Airport: 7Y2, Thompsonville, runway 27, 3,000 × 150 ft, grass/turf ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 35; commercial, flight instructor; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; seat: rear; flight hours: 1,100 total, 30 in this make and model, 1,000 as pilot in command, 200 in the last 90 days, 75 in the last 30 days, 6 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 200° at 10 knots - Visibility: 12 statute miles - Lowest ceiling: 20,000 ft overcast - Temperature: 86 °F, dew point 57 °F - Altimeter: 30.00 inHg - Observed at: TVC, 23 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 19960804020659A](https://openairdocs.org/incident/19960804020659A), Aug 4, 1996: Schler ASK13, Thompsonville, MI, Substantial damage. Tow plane lost power on takeoff. Cut glider loose and it overtook tow plane landing. Landed off runway. Hit stump. (-23) tow plane lost power on takeoff,… 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.