NTSB investigations: Amateur-built UNKNOWN ENG, CO
59 cases on aircraft whose registry engine model is Amateur-built UNKNOWN ENG. Aircraft are matched to the registry by N-number and event date, checked against the reported serial number, make and model, so older matches can be wrong.
Cases per year
| 1968 | 1 |
|---|---|
| 1969 | 1 |
| 1971 | 1 |
| 1972 | 1 |
| 1975 | 1 |
| 1977 | 1 |
| 1980 | 1 |
| 1981 | 3 |
| 1982 | 2 |
| 1987 | 2 |
| 1989 | 1 |
| 1991 | 1 |
| 1993 | 2 |
| 1995 | 1 |
| 1996 | 1 |
| 1997 | 1 |
| 1999 | 1 |
| 2001 | 2 |
| 2002 | 1 |
| 2003 | 1 |
| 2004 | 3 |
| 2005 | 1 |
| 2007 | 3 |
| 2008 | 1 |
| 2009 | 1 |
| 2010 | 3 |
| 2012 | 6 |
| 2013 | 2 |
| 2014 | 1 |
| 2015 | 1 |
| 2016 | 2 |
| 2017 | 1 |
| 2018 | 1 |
| 2019 | 1 |
| 2020 | 3 |
| 2024 | 1 |
| 2025 | 1 |
| 2026 | 1 |
Where
Open the mapLatest cases
Query with SQL
duckdb -csv -c "SELECT c.\"ntsbNumber\", c.\"eventDate\", c.\"eventType\", c.\"eventCity\", c.\"eventStateOrRegion\", a.n_number, a.\"aircraftMake\", a.\"aircraftModel\", c.\"highestInjuryLevel\", c.\"totalFatal\", c.\"completionStatus\", c.report_url
FROM 'https://openairdocs.org/data/latest/ntsb_case_detail.parquet' c LEFT JOIN 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' a ON a.case_mkey = c.\"mKey\" AND a.position = 1
WHERE c.\"eventStateOrRegion\" = 'CO' AND c.\"eventCountry\" = 'USA'
AND c.\"mKey\" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('99999'))
ORDER BY c.\"eventDate\" DESC, c.\"ntsbNumber\" DESC"Prints the whole list as CSV. It reads the release’s Parquet files over HTTPS, so there’s nothing to download first. Install DuckDB to run it.
SELECT c."ntsbNumber", c."eventDate", c."eventType", c."eventCity", c."eventStateOrRegion", a.n_number, a."aircraftMake", a."aircraftModel", c."highestInjuryLevel", c."totalFatal", c."completionStatus", c.report_url
FROM 'https://openairdocs.org/data/latest/ntsb_case_detail.parquet' c LEFT JOIN 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' a ON a.case_mkey = c."mKey" AND a.position = 1
WHERE c."eventStateOrRegion" = 'CO' AND c."eventCountry" = 'USA'
AND c."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('99999'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESCRun it at the DuckDB prompt, or in any tool that reads Parquet over HTTPS. More ways to query the release are on Use the data.
NTSB ANC26LA049Accident · Minor injuriesClass 4 · LimitedInvestigation openWilliam F Schoen RV-7 · Alpine, CONTSB CEN25LA405Accident · Minor injuriesClass 4 · LimitedFinal reportSukhoi SU-26MX · Longmont, COThe pilot's failure to maintain directional control during takeoff.NTSB CEN24LA198Accident · No injuriesClass 4 · LimitedFinal reportBrant T Phillips Super Cub EXP · Franktown, COThe pilot’s failure to maintain aircraft control during final approach and attempted go-around after encountering a sudden windshear.NTSB CEN20CA311Accident · Minor injuriesClass 4 · Data collectionFinal reportAir Tractor AT 401 · Burlington, COThe pilot’s failure to maintain clearance from guy-wires during low-altitude agricultural operations.NTSB CEN20CA277Accident · Minor injuriesClass 4 · Data collectionFinal reportKitfox Kitfox Sport · Rand, COThe encounter with the downdrafts during the attempted takeoff, which resulted in decreased airplane's climb performance and subsequent impact with terrain.NTSB CEN20LA278Accident · 1 fatalClass 3 · LimitedFinal reportGrumman G164 · Springfield, COThe pilot’s loss of visibility in the cockpit due to foam created by the chemicals loaded in the hopper, which resulted in collision with terrain. Contributing to the accident was the combining of chemicals known to produce foam and the pilot’s failure to…NTSB GAA19CA262Accident · No injuriesData collectionFinal reportCub Crafters Carbon CUB EX · Grand Junction, COThe pilot's failure to maintain clearance from power lines during low-level maneuvering through a canyon.NTSB CEN18LA080Accident · Minor injuriesLimited investigationFinal reportTomlinson Tracy L Tukan · Erie, COThe student pilot’s inadvertent shutting off of the fuel valve while on approach, which resulted in a loss of engine power due to fuel starvation and impact with terrain.NTSB GAA17CA257Accident · Minor injuriesData collectionFinal reportNelson Sydney Vans Acft RV8A · Englewood, COThe pilot's improper landing flare and inadvertent selection of the mixture control, which resulted in a hard, bounced landing during gusting crosswind wind conditions.NTSB CEN16FA331Accident · 2 fatalField investigationFinal reportStemme S10 VT · Telluride, COThe pilot's encounter with a downdraft that exceeded the climb performance of the powered glider and resulted in his inability to maintain clearance from the trees. Contributing to the accident was the pilot's decision to fly near building clouds and rain…NTSB GAA16CA201Accident · Minor injuriesData collectionFinal reportHelicycle/Morrisey RR RM-1 · Denver, COThe pilot's failure to maintain control of the helicopter yaw while operating in conditions conducive to loss of tail rotor effectiveness, resulting in an uncommanded rapid right yaw and ground impact.NTSB GAA16CA061Accident · No injuriesData collectionFinal reportMelvin K Callen Backcountry Supercub · Fort Morgan, COThe pilot's excessive braking during the landing roll, which resulted in a nose over.NTSB CEN15LA084Accident · Minor injuriesLimited investigationFinal reportEnstrom 280FX · Fort Lupton, COThe loss of engine power during cruise flight for reasons that could not be determined based on the available information.NTSB CEN13LA488Accident · No injuriesLimited investigationFinal reportGriffith E/Boyd W E Lancair 360 · Nucla, COThe pilot’s failure to extend the airplane’s landing gear before landing.NTSB CEN13LA368Accident · 2 fatalLimited investigationFinal reportNanchang China CJ-6 · Wolcott, COThe pilots decision to perform an aerobatic maneuver at a low altitude from which he was unable to recover.NTSB CEN12LA668Accident · No injuriesLimited investigationFinal reportThompson RV-6 · Pagosa Springs, COThe pilot’s failure to maintain directional control of the airplane during the landing roll. Contributing to the accident was the pilot’s lack of landing experience at high density altitudes.NTSB CEN12FA462Accident · 2 fatalField investigationFinal reportNanchang China CJ-6A · Walsenburg, COThe pilot's failure to maintain airplane control while turning from base to final leg in the traffic pattern.NTSB CEN12CA442Accident · Minor injuriesData collectionFinal reportDoppelt Fredric F F. 8L Falco · Durango, COThe pilot's failure to maintain control of the airplane and the instructor's delayed remedial action.NTSB CEN12LA389Accident · No injuriesLimited investigationFinal reportHoyle Fighter Escort Wings · Pueblo, COAn internal failure of one of the electrical system’s two batteries combined with the inadequate electrical system design, which resulted in a total loss of engine power.NTSB CEN12LA374Accident · No injuriesLimited investigationFinal reportYakovlev Yak-52 · Loveland, COThe pilot’s inadvertent closure of the pneumatic system valve, which resulted in the nose landing gear not fully extending before landing. Contributing to the accident was the pilot's reliance on the mechanical landing gear position indicators instead of the…NTSB CEN12CA263Accident · No injuriesData collectionFinal reportCampbell David Legacy · Durango, COThe pilot’s improper flare and subsequent aerodynamic stall, which resulted in a hard landing.NTSB CEN10CA376Accident · No injuriesData collectionFinal reportWells Terry Hula Girl · Wellington, COA partial loss of engine power due to the inadequate design of the engine cowling.NTSB CEN10LA242Accident · No injuriesLimited investigationFinal reportJorritsma Jerrold S Berkut · Loveland, COA loss of engine power due to a malfunction of the fuel controller resulting in a compressor stall.NTSB CEN10FA115Accident · 3 fatalField investigationFinal reportPiper PA-25-235 · Boulder, COThe failure of both pilots to see and avoid the other resulting in a midair collision. Contributing to the accident was the lack of perceived visual relative motion of the Piper and the Cirrus to the pilot of each airplane, the terrain background, and the…NTSB CEN09CA257Accident · No injuriesData collectionFinal reportEnstrom 280FX · Dacono, COA partial loss of engine power for undetermined reasons.NTSB CEN09LA075Accident · Minor injuriesLimited investigationFinal reportHauser U/Hauser J KIT FOX CL · Boulder, COA loss of engine thrust due to the pilot's inadvertent activation of the propeller controls. Contributing to the accident were the non-standard propeller controls and the pilot's lack of experience in the airplane.NTSB DEN08CA045Accident · No injuriesData collectionFinal reportPiper PA-46-310P · Gunnison, COThe pilot's failure to maintain directional control of the airplane during takeoff resulting in the airplane hitting a snowbank and subsequently, the ground.NTSB DEN07LA098Accident · Serious injuriesLimited investigationFinal reportBoeing 757-251 · Denver, COThe inadvertent encounter with moderate turbulence during the approach which resulted in a serious injury to the flight attendantNTSB DEN07FA089Accident · 1 fatalField investigationFinal reportSchleicher Alexander ASH 26E · Castle Rock, COthe pilot's failure to maintain aircraft control resulting in an inadvertent stall/mush.NTSB DEN05IA083Incident · No injuriesIncident investigationFinal reportMcDonnell Douglas DC-9-82 · Denver, COthe reason for the occurrence was not determined.NTSB DEN05IA025Incident · No injuriesIncident investigationFinal reportBlair-American USA · Fort Collins, COthe Blair-American and the Cessna pilot's inadequate visual lookout, and student pilot's failure to give right-of-way to a landing aircraft, which resulted in a runway incursion and subsequent collision. Contributing factors include the student instructor's…NTSB DEN04LA108Accident · No injuriesLimited investigationFinal reportDavis-Zenair Stol CH 801 · Erie, COimpact with terrain during a forced landing following a loss of engine power for underdetermined reasons. A contributing factor was the lack of suitable terrain for a forced landing.NTSB DEN04CA101Accident · No injuriesData collectionFinal reportWhitlock Rotorway Exec 162F · Meeker, COaircraft control not maintained by the pilot. A contributing factor was the failure of the supercharger.NTSB DEN03LA129Accident · Minor injuriesLimited investigationFinal reportDavis Zenair Stol 701 · Aurora, COthe pilot's failure to attain adequate airspeed and establish a climb resulting in a stall/mush and collision with the ground. Contributing factors were his premature turn onto the downwind leg, and the plowed/furrowed terrain.NTSB DEN02FA070Accident · No injuriesField investigationFinal reportBoone Rotorway 162-F · Englewood, COthe pilot encountering settling with power. A factor contributing to the accident was the tailwind.NTSB DEN01LA164Accident · No injuriesLimited investigationFinal reportCessna 172RG · Englewood, COthe failure of the dual student to verify that the landing gear was down and locked, and the failure of the flight instructor to adequately supervise the dual student.NTSB DEN01LA121Accident · No injuriesLimited investigationFinal reportGriffith-Boyd Lancair 360 · La Junta, COa wheels-up landing due to an uncommanded gear retraction resulting from a short circuit of the landing gear electrical wiring.NTSB DEN99LA068Accident · No injuriesLimited investigationFinal reportWeatherly 201-C · Two Buttes, COThe pilot's selection of an unsuitable landing area. Factors associated with the accident were an unknown object in the landing area, a failure of a main landing gear tire, and the pilot's inadvertent ground loop/swerve.NTSB FTW97LA079Accident · Minor injuriesLimited investigationFinal reportHughes 369HS · Wellington, COThe pilot's failure to maintain control of the aircraft and his improper autorotation technique that induced the roll and subsequent ground collision. A factor was his lack of recurrent training.NTSB FTW96LA360Accident · Minor injuriesLimited investigationFinal reportCresap Early Bird Jenny · Kersey, COFailure of the throttle linkage. A related factor was the lack of suitable terrain for the forced landing.NTSB FTW95LA405Accident · Minor injuriesLimited investigationFinal reportLet Blanik L-13 · Como, COThe pilot allowing the glider to develop an excessive descent rate. A factor was the premature and automatic disengagement of the winch-tow system.NTSB DEN93LA086Accident · Serious injuriesLimited investigationFinal reportBalloon Works 7B-15 · Colorado Sprgs, COThe passenger's failure to assume the proper landing position as instructed by the pilot in command. A factor was: the high wind.NTSB DEN93LA065Accident · No injuriesLimited investigationFinal reportCessna 182A · Stratton, COThe selection of unsuitable terrain for a precautionary landing by the pilot in command. A factor was: misjudging the deteriorating weather.NTSB DEN92IA014Incident · No injuriesIncident investigationFinal reportCessna 172RG · Broomfield, COFailure of the left main landing gear pivot assembly due to ductile torsional overstress.NTSB DEN89LA088Accident · Minor injuriesLimited investigationFinal reportMiller S.A.L. 2/3 Mustang · Erie, COLoss of engine power for an unknown reason. Soft uneven terrain was a contributing factor.NTSB DEN87LA236Accident · No injuriesLimited investigationFinal reportLet L-13 · Buena Vista, COThe plt was ferrying the glider to Buena Vista, Colorado & had previously obtained permission to land on a closed rwy. After being towed to the Buena Vista area, he released the glider from the tow plane & flew in the local area for about 40 min. He then…NTSB DEN87LA124Accident · No injuriesLimited investigationFinal reportBrantly Helicopter 305 · Golden, COThe commercial plt was performing hover tests in his experimental helicopter at his private helipad, located 60 feet from his residence. The plt reported winds as variable gusting to 40 knots. The plt's attention was diverted and a wind gust pushed the…NTSB DEN82DA169Accident · Serious injuriesFinal reportQuicksilver Mxii · Broomfield, COReportedly, the pilot made an intersection takeoff from about midfield on runway 02. He stated that he took off at rotation speed plus 2 KTS. The passenger reported that they reached about 40 ft AGL, then lost lift and begun to settle. As the two-place…NTSB DEN82DA165Accident · No injuriesFinal reportBellanca 7GCBC · Yuma, COThe pilot stated that as he touched down the aircraft porpoised "a couple of times." When the aircraft had slowed to approximately 25-30 mph it ran off the runway into soft dirt and nosed over.NTSB DEN82FTE10Accident · No injuriesClosedMome II · Longmont, CO