# NTSB DEN07LA152: Slingsby Swallow Type T.45, N7476, Hutchinson, KS, September 2, 2007 - Type: NTSB accident investigation - Classification: Accident · Serious injuries · Limited investigation · Final report - Date: September 2, 2007, 15:45 local (20:45 UTC) - Place: Hutchinson, KS - Coordinates: 37.9225, -97.90361 - Nearby events: https://openairdocs.org/map.md?lat=37.9225&lon=-97.9036&mi=10 - Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping) - Highest injury: Serious injuries - Injuries: 1 serious - Status: Completed, report January 31, 2008 - Report: Approved by Office Director - Parties: Wichita, Kansas - NTSB case key (mKey): 66593 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN07LA152 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/66593/pdf - Page: https://openairdocs.org/ntsb/DEN07LA152 ## Probable cause The pilot's failure to maintain aircraft control during a low altitude release resulting in an inadvertent stall/spin. Contributing factors were the pilot's decision to turn back to the airport at low altitude and the wind gust. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of control - in flight, takeoff - initial climb - weather condition - gusts (contributing factor) - aircraft control - not maintained, pilot in command (cause) - in-flight planning/decision - improper, pilot in command (contributing factor) - stall/spin - inadvertent, pilot in command (cause) - In flight collision with terrain/water, descent - uncontrolled - terrain condition - ground ## Analysis The glider achieved flight as normal prior to rotation by the tow plane. As the glider continued along the runway there seemed to be some sort of external downward force like a wind gust. The glider wheel touched the runway and the glider bounced into the air, gaining altitude rapidly. The pilot released the glider tow line and continued straight. The pilot stated that the tow plane was not in sight and there was an impression that the tow plane may have taken off. The pilot banked the glider to the right to return to the airport. During the turn the right wing stalled and the glider lost altitude rapidly. The glider impacted terrain to the west of the runway on airport property. The pilot stated that the accident could have been prevented by making a small right turn and landing straight ahead on the remaining runway. ## Factual narrative On September 2, 2007, approximately 1545 central daylight time, a Slingsby Swallow Type T.45 glider, N7476, sustained substantial damage when it impacted terrain following a loss of control during takeoff from the Sunflower Aerodrome Gliderport (SN76), Hutchinson, Kansas. The private pilot, who was the sole occupant, was seriously injured. The aircraft was registered to Wichita Soaring Association, Inc., Wichita, Kansas, and operated by the pilot. The personal flight was being conducted under the provisions of Title 14 Code of Federal Regulations Part 91 without a flight plan. The local flight was originating at the time of the accident. According to the pilot's statement, the glider achieved flight as normal prior to rotation by the tow plane. As the glider continued along the runway "there seemed to be some sort of external downward force like a wind gust." The glider wheel touched the runway and the glider bounced into the air, "gaining altitude rapidly." The pilot released the glider tow line and continued straight. The pilot stated that "the tow plane was not in sight and there was an impression that the tow plane may have taken off." The pilot banked the glider to the right to return to the airport. During the turn, "the right wing stalled and the glider lost altitude rapidly." The glider impacted terrain to the west of the runway on airport property. According to the Pilot/Operator Aircraft Accident/Incident Report (NTSB Form 6120.1), Recommendation section (How could this accident/incident have been prevented?), the pilot stated, "A small turn to the right to place the glider slightly right and out of the way of the tow plane with a landing straight ahead on the remaining runway." Examination of the accident site by a Federal Aviation Administration inspector revealed that the glider came to rest inverted. The forward fuselage was destroyed, and both wings were separated from the airframe. No anomalies were noted with the glider systems. At 1552, the automated weather observation from Hutchinson Municipal Airport, located approximately 9 miles north of the accident site, reported variable winds at 6 knots, visibility 10 statute miles, sky clear, temperature 32 degrees Celsius, dew point 11 degrees Celsius, and an altimeter setting of 30.12 inches of Mercury. ## Aircraft - Registration: [N7476](https://openairdocs.org/aircraft/N7476), registered now, S/N 1660, built 1968 (OpenAirDocs) - Reported make and model: Slingsby Swallow Type T.45 - Registry model: [Slingsby SWALLOW TYPE T.45](https://openairdocs.org/model/slingsby-swallow-type-t-45) (registry code 8320304) (OpenAirDocs) - Registry engine: [NONE](https://openairdocs.org/engine/none) (registry code 00000, none) (OpenAirDocs) - Category: Glider - Serial number: 1660 - Airframe hours: 1285 - Damage: Substantial damage - Flight: Glider tow, Part 91 - Operator: Sonja Flesberg - Registered owner: Wichita Soaring Association, Inc - Airworthiness certificate: Standard, Normal - Last inspection: Annual, May 1, 2007 - Departed: SN76, Hutchinson, KS - Airport: SN76, Sunflower Aerodrome Gliderport ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 42; injuries: serious; private; airplane ratings: single-engine land; medical: class 3, without waivers/limitations; last flight review July 1, 2006; seat: single; flight hours: 121 total, 3 in this make and model, 73 as pilot in command, 2 in the last 90 days, 1 in the last 30 days ## Weather - Conditions: Visual (VMC), Day - Wind: variable at 6 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 90 °F, dew point 52 °F - Altimeter: 30.12 inHg - Observed at: KHUT, 9 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 20070902022759A](https://openairdocs.org/incident/20070902022759A), Sep 2, 2007: Slnsby T45, Hutchinson, KS, Substantial damage. (-23) The glider was being towed by another aircraft for departure when the aircraft enterd pitch oscillations, at approximately 100 feet AGL, the glider pilot… 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.