NTSB investigations: Amateur-built UNKNOWN ENG, AK
57 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
| 1970 | 1 |
|---|---|
| 1971 | 2 |
| 1974 | 1 |
| 1978 | 1 |
| 1979 | 1 |
| 1984 | 1 |
| 1986 | 1 |
| 1987 | 1 |
| 1988 | 3 |
| 1990 | 1 |
| 1992 | 1 |
| 1993 | 1 |
| 1994 | 1 |
| 1996 | 1 |
| 1998 | 1 |
| 2001 | 2 |
| 2002 | 1 |
| 2003 | 1 |
| 2004 | 4 |
| 2006 | 3 |
| 2008 | 2 |
| 2009 | 2 |
| 2010 | 1 |
| 2011 | 1 |
| 2012 | 3 |
| 2013 | 2 |
| 2014 | 1 |
| 2016 | 4 |
| 2017 | 2 |
| 2018 | 1 |
| 2019 | 2 |
| 2020 | 1 |
| 2021 | 1 |
| 2022 | 2 |
| 2023 | 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\" = 'AK' 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" = 'AK' 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 ANC26LA045Accident · No injuriesClass 4 · LimitedInvestigation openCessna 170B · Bethel, AKNTSB ANC25LA091Accident · No injuriesClass 3 · LimitedPreliminary reportVu Holdings LLC/DBA Vanilla UN VA 001 · Ninilchik, AKOn August 20, 2025, at about 0632 Alaska daylight time, a Platform Aerospace VA 001 Unmanned Aerial System (UAS), N246VU, was substantially damaged when it was involved in an accident on a beachside cliff near Ninilchik, Alaska. The aircraft was unmanned. The…NTSB ANC23LA078Accident · No injuriesClass 3 · LimitedFinal reportRhodes Steven D SR3500 · Nenana, AKA total loss of engine power due to fuel starvation. Contributing was the owner/builder’s inadequate maintenance.NTSB CEN22LA380Accident · No injuriesClass 4 · LimitedFinal reportCessna 172 · McCarthy, AKThe pilot’s failure to maintain control of the airplane during takeoff in turbulent weather conditions.NTSB ANC22LA059Accident · No injuriesClass 4 · LimitedFinal reportKakeldey Ronald O Smith PA12 EXP · Beluga, AKThe pilot’s loss of control during the landing roll.NTSB ANC21LA058Accident · No injuriesClass 4 · LimitedFinal reportMaule M-5-210C · Anchorage, AKThe pilot’s impact with a log while dragging an off-airport landing site.NTSB ANC20CA062Accident · No injuriesClass 4 · Data collectionFinal reportCub Crafters CCK-1865 · Juneau, AKThe pilot's failure to maintain directional control during the landing rollout, which resulted in a ground loop.NTSB GAA19CA370Accident · No injuriesData collectionFinal reportKirk Ellis Wendell Ptundradactyl · Friday Creek, AKThe pilot's excessive brake application during landing on a short runway due to his lack of familiarity with the toe brakes, which resulted in a nose-over.NTSB GAA19CA349Accident · No injuriesData collectionFinal reportPiper PA18 · Beluga, AKThe pilot's selection of unsuitable terrain for landing, which resulted in a noseover.NTSB GAA18CA454Accident · No injuriesData collectionFinal reportCessna 172 · Meadow Lakes, AKThe pilot’s selection of the wrong fuel tank for departure, which resulted in fuel starvation and the subsequent total loss of engine power.NTSB GAA17CA299Accident · No injuriesData collectionFinal reportThomas E Hudzinski Backcountry Super CR · Talkeetna, AKThe pilot’s failure to maintain a proper airspeed and his exceedance of the airplane’s critical angle of attack, which resulted in an aerodynamic stall.NTSB ANC17CA023Accident · No injuriesData collectionFinal reportWsk-Pzl Warzawa-Okecie PZL 104 Wilga 80 · Talkeetna, AKThe pilot's failure to maintain directional control during the landing roll. Contributing to the accident were the pilot's lack of training and experience in the accident make and model airplane.NTSB ANC17LA013Accident · Minor injuriesLimited investigationFinal reportRobinson Helicopter R22 · Palmer, AKThe pilot's failure to maintain main rotor revolutions per minute (RPM) during a pinnacle landing, which resulted in a main rotor stall condition, a loss of control, and a subsequent impact with terrain. A contributing factor was the flight instructor's…NTSB ANC17LA008Accident · No injuriesLimited investigationFinal reportAirborne Extreme SQ-12 · Palmer, AKThe fuel injector manufacturer's inappropriate guidance to use a 5-ampere circuit breaker in place of the required 10-ampere circuit breaker on the fuel injector circuit, which resulted in the circuit breaker opening, a loss of electrical power to the…NTSB ANC17LA006Accident · Minor injuriesLimited investigationFinal reportPiper PA32R · Bethel, AKA total loss of engine power due to oil starvation, which resulted from an oil cooler leak at a fractured brazed seam.NTSB ANC16LA047Accident · No injuriesLimited investigationFinal reportAeropro CZ A220 · McCarthy, AKThe pilot’s failure to maintain directional control during the takeoff roll, which resulted in a loss of control and impact with terrain. Contributing to the accident were engine power surges due to the bent carburetor throttle valve lever.NTSB ANC14CA086Accident · No injuriesData collectionFinal reportMiller Gregory S Bushwacker · Iliamna, AKThe pilot's failure to maintain control on landing, resulting in the collision with terrain.NTSB ANC14CA001Accident · No injuriesData collectionFinal reportPiper PA 18-150 · Iliamna, AKThe pilot's failure to maintain aircraft control during the landing roll with a tailwind.NTSB ANC13FA030Accident · 2 fatalField investigationFinal reportBeech 1900C · Aleknagik, AKThe flight crew's failure to maintain terrain clearance, which resulted in controlled flight into terrain in instrument meteorological conditions. Contributing to the accident were the flight crew's failure to correctly read back and interpret clearance…NTSB ANC12CA070Accident · No injuriesData collectionFinal reportDehavilland DHC-2 · Cantwell, AKThe right seat passenger’s inadvertent contact with the emergency fuel shutoff valve, which resulted in fuel starvation and a total loss of engine power. Contributing to the accident was the pilot's failure to provide a thorough preflight briefing to the…NTSB ANC12CA032Accident · No injuriesData collectionFinal reportRobinson Helicopter R22 Alpha · Palmer, AKThe pilot's selection of unsuitable terrain for landing, which resulted in a tailrotor strike.NTSB ANC12CA029Accident · No injuriesData collectionFinal reportCessna 180 · Palmer, AKThe pilot’s failure to maintain adequate clearance from terrain during low-level maneuvering.NTSB ANC11LA060Accident · Serious injuriesLimited investigationFinal reportSonex / John D. McCarter Waiex · Sterling, AKThe pilot's failure to maintain sufficient airspeed to avoid an aerodynamic stall following a loss of engine power for undetermined reasons.NTSB ANC10CA050Accident · No injuriesData collectionFinal reportCessna 180 · Kenai, AKThe pilot's selection of unsuitable terrain for landing, resulting in the airplane nosing over during taxi.NTSB ANC09CA109Accident · No injuriesData collectionFinal reportShort Bros. & Harland SC7 Series · Skwentna, AKThe pilot's failure to maintain directional control while landing on a rough, soft, and narrow airstrip.NTSB ANC09FA052Accident · 2 fatalField investigationFinal reportHarden RV-7 · Elim, AKThe pilot's continued visual flight into instrument meteorological conditions, which resulted in an in-flight collision with terrain.NTSB ANC08LA083Accident · No injuriesLimited investigationFinal reportBell UH-1B · Iliamna, AKThe failure of company maintenance personnel to ensure the helicopter was properly maintained, resulting in a severe in-flight vibration due to collective bounce. Contributing to the accident was loose and worn bearings on the helicopter's stabilizer bar,…NTSB ANC08CA065Accident · No injuriesData collectionFinal reportde Havilland DHC-3 · Talkeetna, AKThe pilot's selection of an unsuitable landing site, which resulted in an overload failure of the tail ski assembly during the landing roll.NTSB ANC06FA136Accident · 1 fatalField investigationFinal reportde Havilland DHC-2 · Kodiak, AKThe pilot's failure to maintain adequate airspeed while maneuvering to reverse direction, which resulted in an inadvertent stall and an uncontrolled descent. Factors associated with the accident were the inadvertent stall and wind gusts.NTSB ANC06LA130Accident · Minor injuriesLimited investigationFinal reportMcNabb Bushmaster · Delta Junction, AKAn electrical short that disabled the electronic ignition system of the airplane's engine during the final approach phase for landing, which resulted in a forced landing and collision with high vegetation. A factor contributing to the accident was the failure…NTSB ANC06FA018Accident · 1 fatalField investigationFinal reportAero Vodochody L-39MS · Ketchikan, AKThe pilot's failure to follow published instrument landing procedures and his descent below approach minimums during an IFR circle to land approach, which resulted in the airplane striking the ocean and a loss of engine power. Factors contributing to the…NTSB ANC05LA003Accident · No injuriesLimited investigationFinal reportScan 30 · Anchorage, AKAn in-flight fire during cruise flight for an undetermined reason.NTSB ANC04LA098Accident · 1 fatalLimited investigationFinal reportde Havilland DHC-3 · McGrath, AKThe pilot's inadequate in-flight planning/decision making, his continued VFR flight into instrument meteorological conditions, and his failure to maintain obstacle clearance. Factors contributing to the accident were low ceilings due to smoke, rain, and mist.NTSB ANC04LA093Accident · 1 fatalLimited investigationFinal reportHudson Hiperbipe SNS-7 · Palmer, AKThe pilot's failure to maintain control of the airplane, which resulted in an uncontrolled descent and subsequent in-flight collision with trees. A factor associated with the accident was a low altitude maneuver preformed by the pilot just after takeoff.NTSB ANC04LA052Accident · No injuriesLimited investigationFinal reportDouglas C-54B · McGrath, AKA fuel tank explosion in the left wing auxiliary fuel tank, and subsequent fuel fire that occurred during engine start for an undetermined reason.NTSB ANC03LA112Accident · No injuriesLimited investigationFinal reportDusseau Kitfox · Nikiski, AKA loss of engine power for an undetermined reason, which resulted in an overrun during the emergency landing, and subsequent nose over in swampy terrain.NTSB ANC02LA052Accident · No injuriesLimited investigationFinal reportGrumman G-21 · Northway, AKThe pilot's inadequate compensation for wind conditions during the landing roll, which resulted in an inadvertent ground loop/swerve. A factor associated with the accident was a crosswind.NTSB ANC01LA150Accident · No injuriesLimited investigationFinal reportSlepcev Storch SS-MK4 · Anchorage, AKThe pilot's failure to maintain directional control and an inadvertent ground loop/swerve during the landing roll.NTSB ANC01LA146Accident · Minor injuriesLimited investigationFinal reportDouglas DC-6B · Nuiqsut, AKThe flightcrew's continued use of an unstabilized GPS approach. Factors associated with the accident were low ceilings, and the inadequate coordination between the crew.NTSB ANC98LA071Accident · No injuriesLimited investigationFinal reportCessna 172 · Angoon, AKThe pilot's failure to maintain directional control during the aborted takeoff. A factor associated with the accident was rough and uneven terrain.NTSB ANC96LA069Accident · No injuriesLimited investigationFinal reportGillespie Challenger 2 · Talkeetna, AKThe pilot's failure to properly use the mixture control to enrich the fuel mixture, and the seizure of the piston in the cylinder.NTSB ANC94FA130Accident · 1 fatalField investigationFinal reportPiper PA-18 · Gulkana, AKThe pilot's failure to maintain clearance from terrain.NTSB ANC93IA176Incident · No injuriesIncident investigationFinal reportSikorsky C54A · Anita Bay, AKThe separation of the turbine blade from the power turbine disc.NTSB ANC92LA157Accident · No injuriesLimited investigationFinal reportSikorsky S-58G · Port Alsworth, AKInflight engine compartment fire and post landing fire of undetermined origin.NTSB ANC90LA135Accident · Serious injuriesLimited investigationFinal reportAerospatiale SA-315B · Tok, AKImproper installation of the fuel filter element in the aircraft by company/maintenance personnel, and subsequent contamination of the fuel system by unfiltered fuel. Factors related to the accident were: inadequate design of the fuel filter assembly, which…NTSB ANC88LA123Accident · No injuriesLimited investigationFinal reportde Havilland DHC-2 · Fairbanks, AKThe airplane was on a climbout at approximately 1000 to 1200 feet m.s.l. when the engine quit and the pilot encountered an engine fire. The pilot elected to go back to the airport. The airplane crashed on the taxiway, and the airplane was substantially…NTSB ANC88LA118Accident · No injuriesLimited investigationFinal reportCessna 170B · Anchorage, AKThe plt was practicing touch-&-go landings. On the first landing, the acft bounced & a successful go-around was made. During the second landing, the plt lost directional control of the acft & it went off the left side of the rwy & was damaged.NTSB ANC88LA050Accident · No injuriesLimited investigationFinal reportCessna 180 · Fairbanks, AKThe pilot returned to Fairbanks int'l airport from an intended cross-country flight due to deteriorating weather. During the flight the airplane felt out of trim, and she elected to land on the longest runway available (10,300). During the landing roll she…NTSB ANC87LA069Accident · No injuriesLimited investigationFinal reportFairchild C-119L · Shageluk, AKThe airplane was destabilized by a slight vertical air movement on approach. The pilot touched the airplane down short of the runway proper, collapsing the landing gear before sliding off the strip into adjacent tundra.NTSB ANC86LA164Accident · No injuriesLimited investigationFinal reportCessna 195A · Willow, AKThe pilot reported that while demonstrating high speed taxi, the airplane veered to the left, entered an open trench, and was damaged. An exam of the flight control and brake systems revealed no pre-accident mechanical malfunction or failure.