# NTSB DEN07CA104: Beech B36TC, N6929B, Hudson, CO, June 20, 2007 - Type: NTSB accident investigation - Classification: Accident · No injuries · Data collection · Final report - Date: June 20, 2007, 12:30 local (18:30 UTC) - Place: Hudson, CO - Coordinates: 40.099998, -104.70111 - Nearby events: https://openairdocs.org/map.md?lat=40.1000&lon=-104.7011&mi=10 - Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 2 uninjured - Status: Completed, report July 25, 2007 - Report: Approved by Office Director - NTSB case key (mKey): 66054 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN07CA104 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/66054/pdf - Page: https://openairdocs.org/ntsb/DEN07CA104 ## Probable cause The pilot's improper in-flight decision, and his failure to maintain proper aircraft control during takeoff resulting in an inadvertent stall and the subsequent impact with the runway and terrain. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of control - in flight, takeoff - aircraft control - not maintained, pilot in command (cause) - stall - inadvertent, pilot in command (cause) - in-flight planning/decision - improper, pilot in command (cause) - In flight collision with terrain/water, descent - uncontrolled - terrain condition - ground ## Analysis The pilot took off on the 4,100' asphalt runway. During the takeoff roll, he said everything looked normal. He accelerated to 80 knots and rotated to a normal takeoff attitude. He said the airplane was slow to lift off, but did get into the air with approximately half the runway remaining. Immediately after breaking ground, the stall warning horn came on. The airplane was approximately 3-5 feet in the air when it rolled to the left. The left wing tip struck the ground. The airplane then rolled in the opposite direction striking the runway with the right main landing gear. The airplane then went off the left side of the runway, struck a dirt embankment, got airborne again, and then impacted the terrain in a nose down attitude. The airplane was substantially damaged. The pilot reported doing a full engine run-up prior to the takeoff attempt. All the airplane systems were working properly. The weather conditions at the time of the accident were clear skies, 7 miles visibility, winds 200 degrees at 5 knots, temperature 98 degrees Fahrenheit (F), dew point 34 degrees F, and an altimeter of 30.14 inches. The density altitude was calculated at 8,254 feet. Using an aircraft performance chart for "Take-off Distance - Flaps 0-degrees" provided by the pilot and entering raw weather data for the time of the accident, the chart shows a takeoff distance of approximately 1,950 feet. The chart is based on take-off power set before brake release, landing gear retracted when positive rate of climb is established, and a paved, level, dry runway surface. ## Factual narrative The pilot said he took off on the 4,100' asphalt runway. During the takeoff roll, he said everything looked normal. He accelerated to 80 knots and rotated to a normal takeoff attitude. He said the airplane was slow to lift off, but did get into the air with approximately half the runway remaining. Immediately after breaking ground, the stall warning horn came on. The airplane was approximately 3-5 feet in the air when it rolled to the left. The left wing tip struck the ground. The airplane then rolled in the opposite direction striking the runway with the right main landing gear. The airplane then went off the left side of the runway, struck a dirt embankment, got airborne again, and then impacted the terrain in a nose down attitude. An examination of the airplane showed damage to the trailing corner of the left wing tip, and trailing edge of the left flap. The airplane's nose gear was broken aft. The nose gear doors were bent upward and aft. Keel damage was observed in the nose wheel well between the nose gear pivots and drag brace. Forward fuselage skin in front of, and on both sides of the nose wheel was crushed upward. The three propeller blades showed torsional bending. All three blade tips were bent aft. The pilot reported doing a full engine run-up prior to the takeoff attempt. According to the pilot, all of the airplane's systems were working properly. The weather conditions at the time of the accident were clear skies, 7 miles visibility, winds 200 degrees at 5 knots, temperature 98 degrees Fahrenheit (F), dew point 34 degrees F, and an altimeter of 30.14 inches. The density altitude was calculated at 8,254 feet. Using an aircraft performance chart for "Take-off Distance - Flaps 0-degrees" provided by the pilot and entering raw weather data for the time of the accident, the chart shows a takeoff distance of approximately 1,950 feet. The chart is based on take-off power set before brake release, landing gear retracted when positive rate of climb is established, and a paved, level, dry runway surface. **This narrative was modified on July 10, 2007.** ## Aircraft - Registration: [N6929B](https://openairdocs.org/aircraft/N6929B), registered now, S/N EA-414, built 1984 (OpenAirDocs) - Reported make and model: Beech B36TC - Registry model: [Beech B36TC](https://openairdocs.org/model/beech-b36tc) (registry code 1151609) (OpenAirDocs) - Registry engine: [Continental TSIO-520 series](https://openairdocs.org/engine/continental-tsio-520-series) (registry code 17040, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: EA-414 - Engines: Continental TSIO-520 reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Registered owner: Planes & Properties LLC - Airworthiness certificate: Standard, Normal - Departed: 18V, Hudson, CO ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 66; injuries: none; airline transport; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 3; flight hours: 23,164 total, 632 in this make and model ## Weather - Conditions: Visual (VMC), Day - Wind: 200° at 5 knots - Visibility: 7 statute miles - Lowest ceiling: none - Temperature: 99 °F, dew point 34 °F - Altimeter: 30.13 inHg - Observed at: GXY ## FAA reports on this event (1) The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs). - [Incident 20070620011989I](https://openairdocs.org/incident/20070620011989I), Jun 20, 2007: Beech B36TC, Hudson, CO, Minor damage. (-23) N6929B, a Beech bonanza, landed at platt valley (18V) on runway 33. The wind sock was straight down (calm). The pilot noticed a dust devil to the north.… 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.