# NTSB CHI96LA110: Yakovlev YAK C-11, N9YK, North Vernon, IN, March 16, 1996 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: March 16, 1996, 09:40 local (14:40 UTC) - Place: North Vernon, IN - Coordinates: 39.000286, -85.629981 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=39.0003&lon=-85.6300&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report May 29, 1996 - Report: Approved by Office Director - NTSB case key (mKey): 10211 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI96LA110 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/10211/pdf - Page: https://openairdocs.org/ntsb/CHI96LA110 ## Probable cause Failure of the pilot to maintain adequate airspeed during an aborted landing, which resulted in an inadvertent stall. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of control - in flight, landing - aborted - airspeed - not maintained, pilot in command (cause) - stall - inadvertent, pilot in command (cause) - In flight collision with terrain/water, landing - aborted ## Analysis The pilot said that as he was crossing the threshold for landing, he detected 'an excessive sink rate.' The pilot applied aft stick pressure and climbed to approximately 20 feet AGL, then applied power. The airplane rolled left. The left wing tip struck the terrain about 20 feet left of the runway, followed by the propeller and cowling. The airplane then 'spun in a counter-clockwise direction and fell to the ground, coming to rest with the nose pointed toward the runway, approximately 40 feet from the runway's edge.' Examination of the wreckage at the scene revealed no anomalies which contributed to the accident. ## Factual narrative On March 16, 1996, at 0940 eastern standard time (est), a Yakovlev, Yak C-11, N9YK, operated by a private pilot, sustained substantial damage when during landing at North Vernon, Indiana, the airplane impacted the terrain along side the runway. 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 flight originated at Louisville, Kentucky at 0900 est. In his written statement, the pilot said that as he was crossing the threshold for landing, at an altitude of 20 feet above ground level (AGL) and an airspeed of 100 knots, "an excessive sink rate was detected." The pilot applied aft stick pressure and climbed to approximately 20 feet AGL, then applied power. The airplane rolled left. The left wing tip struck the terrain 20 feet left of the runway, followed by the propeller and cowling. The airplane then "spun in a counter-clockwise direction and fell to the ground coming to rest with the nose pointed toward the runway, approximately 40 feet from the runway's edge." The Federal Aviation Administration inspector who examined the wreckage at the scene found damage to both wing tips, the right main landing gear, the propeller and cowling. The forward fuselage skin, skin along the leading edges of both wings, and skin along the bottom of the fuselage showed substantial wrinkling. The right main wing spar was bent up approximately 25 degrees. Flight control continuity was confirmed. No other anomalies were found. ## Aircraft - Registration: [N9YK](https://openairdocs.org/deregistered/N9YK-2013-07-10), registration cancelled 2013-07-10, S/N 172612, built 1943 (OpenAirDocs) - Reported make and model: Yakovlev YAK C-11 - Registry model: [Yakovlev YAK C-11](https://openairdocs.org/model/yakovlev-yak-c-11) (registry code 05616FC) (OpenAirDocs) - Registry engine: [Amateur-built UNKNOWN ENG](https://openairdocs.org/engine/amateur-built-unknown-eng) (registry code 99999) (OpenAirDocs) - Category: Airplane - Serial number: 172612 - Airframe hours: 3300 - Engines: SHVETSOV A-SH21 720 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Registered owner: William Gossmann - Airworthiness certificate: Special, Experimental (Special) - Last inspection: Annual, September 27, 1995, 23 hours before - Departed: LOU, LOUISVILLE, KY - Destination: OVO - Airport: OVO, North Vernon Municipal, runway 5, 4,500 × 50 ft, concrete ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 53; private; airplane ratings: single-engine land; medical: class 3, valid medical--w/ waivers/lim; seat: front; flight hours: 1,249 total, 23 in this make and model, 1,249 as pilot in command, 25 in the last 90 days, 6 in the last 30 days, 1 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: calm - Visibility: 4 statute miles - Lowest ceiling: none - Temperature: 45 °F - Altimeter: 29.00 inHg - Observed at: BAK, 19 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 19960316004399A](https://openairdocs.org/incident/19960316004399A), Mar 16, 1996: Amtr YAKC11, Northvernon, IN, Substantial damage. Aircraft bounced following a hard landing and looped. (-23) on 03/16/96 at about 10:00 am EST, pilot landed after personal flight. During landing pilot lost… 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.