# NTSB CEN10LA090: Beech C-99, N206AV, Kearney, NE, January 6, 2010 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: January 6, 2010, 06:35 local (12:35 UTC) - Place: Kearney, NE - Coordinates: 40.726943, -99.006668 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=40.7269&lon=-99.0067&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Defining event: [Landing-flare/touchdown: Aerodynamic stall/spin](https://openairdocs.org/ntsb-events/241) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report December 19, 2011 - Report: Approved by Office Director - NTSB office: Central Region - Parties: FAA - NTSB case key (mKey): 75233 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CEN10LA090 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/75233/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=75233 - Page: https://openairdocs.org/ntsb/CEN10LA090 ## Probable cause The failure of the pilot to maintain adequate airspeed during the approach resulting in a stall. Contributing to the accident was the accumulation of structural icing during the flight. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Performance/control parameters](https://openairdocs.org/ntsb-findings/01062000): Aircraft › Aircraft oper/perf/capability · Not attained/maintained (probable cause); cases with it: [Beech C-99, 1 case](https://openairdocs.org/ntsb-findings/01062000/cases.md?model=1154006), [All aircraft, 1,269 cases](https://openairdocs.org/ntsb-findings/01062000/cases.md) - [Aircraft](https://openairdocs.org/ntsb-findings/01020000): Aircraft › Aircraft systems · Malfunction; cases with it: [Beech C-99, 1 case](https://openairdocs.org/ntsb-findings/01020000/cases.md?model=1154006), [All aircraft, 63 cases](https://openairdocs.org/ntsb-findings/01020000/cases.md) - [Navigation system: stall warning system](https://openairdocs.org/ntsb-findings/01023418): Aircraft › Aircraft systems · Not specified; cases with it: [Beech C-99, 1 case](https://openairdocs.org/ntsb-findings/01023418/cases.md?model=1154006), [All aircraft, 4 cases](https://openairdocs.org/ntsb-findings/01023418/cases.md) - [Ceiling/visibility/precip](https://openairdocs.org/ntsb-findings/03035000): Environmental issues › Conditions/weather/phenomena · Effect on equipment (probable cause); cases with it: [Beech C-99, 1 case](https://openairdocs.org/ntsb-findings/03035000/cases.md?model=1154006), [All aircraft, 65 cases](https://openairdocs.org/ntsb-findings/03035000/cases.md) ## Sequence of events The events NTSB coded, in order, by phase of flight. The defining event best describes what happened. - [Approach-IFR final approach: Structural icing](https://openairdocs.org/ntsb-events/210); cases with it: [Beech C-99, 1 case](https://openairdocs.org/ntsb-events/210/sequence.md?model=1154006), [All aircraft, 102 cases](https://openairdocs.org/ntsb-events/210/sequence.md) - [Landing-flare/touchdown: Aerodynamic stall/spin](https://openairdocs.org/ntsb-events/241) (defining event); cases with it: [Beech C-99, 1 case](https://openairdocs.org/ntsb-events/241/sequence.md?model=1154006), [All aircraft, 1,529 cases](https://openairdocs.org/ntsb-events/241/sequence.md) - [Landing-flare/touchdown: Hard landing](https://openairdocs.org/ntsb-events/092); cases with it: [Beech C-99, 1 case](https://openairdocs.org/ntsb-events/092/sequence.md?model=1154006), [All aircraft, 2,102 cases](https://openairdocs.org/ntsb-events/092/sequence.md) ## Analysis The pilot reported that the airplane picked up light to moderate icing on approach to land and that he cycled the deicing boots once prior to the final approach fix. The pilot was established on the instrument landing system approach when he broke out of the weather about 250 feet above ground level. He estimated that the approach brought the airplane 60 feet right of the runway centerline so he made a correction to align the airplane with the runway. When the airplane returned to level flight and was about 25 feet above the runway, the left wing stalled and the airplane landed hard on the left main landing gear, bending the rear spar of the left wing. During the postaccident inspection of the airplane, ice was noted on the wings and deicing boots. The pilot did not recall the stall warning horn activating during the approach. The stall warning horn’s circuit breaker was found to be tripped during the postaccident inspection. The cause of the tripped circuit breaker could not be determined. An examination of the remaining systems revealed no anomalies. ## Factual narrative On January 6, 2010, at 0635 central standard time, a Beech C-99, N206AV, was substantially damaged during a hard landing at Kearney Municipal Airport (EAR), Kearney, Nebraska. The commercial pilot was not injured. The non-scheduled cargo flight, operated by Ameriflight, LLC., was conducted under the provisions of 14 Code of Federal Regulations Part 135 with an Instrument Flight Rules (IFR) flight plan. The cross-country flight originated at Eppley Airfield (OMA), Omaha, Nebraska, and was en route to EAR. According to the pilot, the airplane picked up light to moderate icing during the approach and he cycled the deicing boots once prior to the final approach fix. The pilot reported that he was established on the instrument landing system (ILS) approach to runway 36 at 120 knots indicated airspeed, configured with landing gear down, and 30 percent flaps, when he broke out of the weather about 250 feet above ground level. The pilot estimated that the approach brought the airplane 60 feet right of the runway centerline so he made a correction to align the airplane with the runway. The pilot continued that when the airplane was wings level and about 25 feet above the runway the left wing stalled and the airplane landed hard on the left main landing gear, bending the rear spar of the left wing. During the postflight inspection of the airplane there was 3/8 to 1/2 inch of ice observed on portions of the airplane’s wings, including the leading edge surfaces of the deicing boots. The pilot further reported that he did not recall the stall warning horn activating during the approach. Weather at EAR at 0635 was reported as 21 degrees Fahrenheit (F), dew point 19 degrees F, visibility ½ mile with freezing fog, ceiling 200 feet overcast, and winds from 130 degrees at 4 knots. The STALL WARN POWER circuit breaker was found popped during the postaccident inspection. The cause of the popped circuit breaker could not be determined. An examination of the remaining systems revealed no anomalies. ## Aircraft - Registration: [N206AV](https://openairdocs.org/aircraft/N206AV), registered now, S/N U-206, built 1983 (OpenAirDocs) - Reported make and model: BEECH C-99 - Registry model: [Beech C-99](https://openairdocs.org/model/beech-c-99) (registry code 1154006) (OpenAirDocs) - Registry engine: [Pratt & Whitney Canada PT6A-60A](https://openairdocs.org/engine/pratt-whitney-canada-pt6a-60a) (registry code 52043, turbo-prop) (OpenAirDocs) - Category: Airplane - Serial number: U-206 - Airframe hours: 33106 - Engines: P&W CANADA PT6A-60A 1050 horsepower turbo prop; P&W CANADA PT6A-60A 1050 horsepower turbo prop - Damage: Substantial damage - Flight: Part 135 - Operator: Ameriflight, LLC, doing business as Ameriflight, LLC - Registered owner: Wilmington Trust Co Trustee - Airworthiness certificate: Standard, Normal - Last inspection: AAIP, October 1, 2009 - Departed: OMA, Omaha, NE - Destination: EAR, Kearney, NE - Flight plan: IFR - Airport: EAR, Kearney Regional Airport, runway 36, 7,094 × 150 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 35; injuries: none; commercial; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 2, without waivers/limitations; last flight review October 23, 2009; seat: left; flight hours: 1,300 total, 216 in this make and model ## Weather - Conditions: Instrument (IMC), Dawn - Wind: calm - Visibility: 0 statute miles - Lowest ceiling: 200 ft overcast - Temperature: 21 °F, dew point 19 °F - Altimeter: 30.00 inHg - Observed at: EAR ## 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 20100106025779A](https://openairdocs.org/incident/20100106025779A), Jan 6, 2010: Beech C-99, Kearney, NE, Substantial damage. Aircraft was performing an ILS approach to rwy 36 at Kearney Municipal Airport in Kearney, Nebraska. The one half to three quarters of an inch of ice which… ## Docket (6 files) The files NTSB released with the investigation on November 3, 2011, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=75233. 3.1 MB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 1.7 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40342046&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1-Redacted.PDF - RECORD OF CONVERSATION - CEN10LA090 - Pilot (item 2, .PDF, 34 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40355284&FileExtension=.PDF&FileName=RECORD%20OF%20CONVERSATION%20-%20CEN10LA090%20-%20Pilot-Master.PDF - Statement of Party Representatives to NTSB Investigation (item 3, .PDF, 59 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40324880&FileExtension=.PDF&FileName=Statement%20of%20Party%20Representatives%20to%20NTSB%20Investigation-Redacted.PDF - Release of Aircraft Wreckage, NTSB Form 6120.15 (item 4, .PDF, 44 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40324879&FileExtension=.PDF&FileName=Release%20of%20Aircraft%20Wreckage,%20NTSB%20Form%206120.15-Redacted.PDF - Photo 1 - Ice on wing (item 5, .PDF, 881 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40355990&FileExtension=.PDF&FileName=Photo%201%20-%20Ice%20on%20wing-Master.PDF - Photo 2 - Left Wing Damage (item 6, .PDF, 364 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40355997&FileExtension=.PDF&FileName=Photo%202%20-%20Left%20Wing%20Damage-Master.PDF 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.