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NTSB investigations: Hiller UH-12E, WA

36 cases on aircraft the registry lists as Hiller UH-12E. 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.

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19642026

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Query with SQL

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" = 'WA' AND c."eventCountry" = 'USA' AND c."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.aircraft_model_code IN ('4360122', '4360137')) ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC

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\" = 'WA' AND c.\"eventCountry\" = 'USA'
    AND c.\"mKey\" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.aircraft_model_code IN ('4360122', '4360137'))
  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" = 'WA' AND c."eventCountry" = 'USA'
  AND c."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.aircraft_model_code IN ('4360122', '4360137'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC

Run 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 WPR25LA246Accident · No injuriesClass 4 · LimitedFinal reportHiller UH-12E · Fobes Hill, WAThe pilot’s abrupt maneuver to avoid a powerline during an aerial application flight, which resulted in the helicopter’s impact with terrain.Aug 11, 2025 · N703WA · Substantial damage NTSB WPR22LA245Accident · Serious injuriesClass 4 · LimitedFinal reportHiller UH-12E · Wenatchee, WAThe pilot’s failure to maintain clearance from power lines during low-level operations in light rain conditions.Jul 6, 2022 · N130HA · Destroyed NTSB SEA99LA022Accident · No injuriesLimited investigationFinal reportHiller UH-12E · Wenatchee, WAFuel exhaustion due to the pilot's failure to accomplish refueling.Dec 17, 1998 · N893FW · Substantial damage NTSB SEA99FA013Accident · 1 fatalField investigationFinal reportHiller UH-12E · Marshall, WAThe loss of the bolt that connects the lateral cyclic linkage push rod to the lower end of the upper firewall-mounted lateral cyclic linkage bellcrank, resulting in an uncontrolled descent into the terrain.Nov 10, 1998 · N752GB · Destroyed NTSB SEA98LA124Accident · Minor injuriesLimited investigationFinal reportHiller UH-12E · Eltopia, WAFatigue of the control rotor blade spar and failure of the maintenance inspector to follow the procedures set forth in the airworthiness directive.Jul 7, 1998 · N5360V · Destroyed NTSB SEA96LA100Accident · No injuriesLimited investigationFinal reportHiller UH-12 · Walla Walla, WAthe pilot's inadequate preflight/planning, and his failure to refuel the helicopter with sufficient fuel before flight, which resulted in fuel exhaustion and a subsequent forced landing. A factor relating to the accident was: an inaccurate fuel quantity…May 27, 1996 · N174HA · Substantial damage NTSB SEA94LA149Accident · Minor injuriesLimited investigationFinal reportHiller-Soloy UH-12L4 · Clarkston, WADisconnection of the ballast bar aft retaining pin. Factor(s) were: tail rotor blade separation and reduced aircraft control.Jun 14, 1994 · N67264 · Substantial damage NTSB SEA93LA181Accident · No injuriesLimited investigationFinal reportHiller UH-12E · Auburn, WAFailure of the connecting rod bolt. The high vegetation was a factor.Aug 23, 1993 · N9785C · Substantial damage NTSB SEA90LA025Accident · No injuriesLimited investigationFinal reportHiller UH-12E · Raymond, WALoss of engine power due to fatigue failure of the impeller. The helicopter was substantially damaged as a result of a roll-over on uneven terrain.Nov 29, 1989 · N9762C · Substantial damage NTSB SEA87FA106Accident · 1 fatalField investigationFinal reportHiller UH-12E · Shelton, WAThe pilot was properly certificated for the flight; however, due to operator insurance restrictions, all prior commercial flights had required the owner/operator to accompany this pilot, therefore this was the pilot's first commercial flight as sole pilot.…May 28, 1987 · N28875 · Destroyed NTSB SEA85LA031Accident · Minor injuriesLimited investigationFinal reportHiller UH-12ET · Hoquiam, WAPlt reported that while in normal cruise flight, a total loss of power occurred. Autorotation was effected in mountainous, wooded terrain. Examination of the engine showed continuity and freedom of rotation. Examination of the fuel system disclosed no…Dec 18, 1984 · N100LM · Substantial damage NTSB SEA84LA002Accident · No injuriesLimited investigationFinal reportHiller UH12-E · Tenino, WAThe plt visually checked the fuel tanks prior to takeoff & thought he had seen fuel in the tanks. The fuel gauges were inoperative & he was using timing as a method to determine the remaining fuel. Aprx 5 min after takeoff, the eng lost power as he was lining…Oct 2, 1983 · N401HA · Substantial damage NTSB SEA82DA164Accident · No injuriesFinal reportHiller-Soloy UH-12E · Spirit Lake, WAPilot performed autorotation from 2000 feet to check RPM. At 200-300 feet when collective was added power loss occurred. Aircraft landed hard and severed tail boom. Logging support operations.Sep 15, 1982 · N513HA · Substantial damage NTSB SEA81DYE11Accident · No injuriesClosedHiller Acft UH-12E · Beaver, WAJan 7, 1981 · N28875 · Substantial damage NTSB SEA81DYE08Accident · No injuriesClosedHiller Acft UH-12E · Forks, WANov 19, 1980 · N542HA · Substantial damage NTSB SEA80DYE32Accident · Serious injuriesClosedHiller Acft UH-12E · Forks, WAMay 15, 1980 · N5359V · Destroyed NTSB SEA79FYP31Accident · No injuriesClosedHiller Acft UH-12E · Quincy, WAJun 29, 1979 · N65048 · Substantial damage NTSB SEA78DYE37Accident · Minor injuriesClosedHiller Acft UH-12E · Amanda Park, WASep 25, 1978 · N94519 · Destroyed NTSB SEA78DYP52Accident · No injuriesClosedHiller Acft UH-12E · Moses Lake, WASep 9, 1978 · N48121 · Substantial damage NTSB SEA78FYE16Accident · No injuriesClosedHiller Acft UH-12E · Forks, WAMar 20, 1978 · N5359V · Substantial damage NTSB SEA78FYE11Accident · No injuriesClosedHiller Acft UH-12E · Montesano, WAMar 6, 1978 · N100LM · Substantial damage NTSB SEA77DYE04Accident · Minor injuriesClosedHiller Acft UH-12E · Neilton, WADec 1, 1976 · N93479 · Destroyed NTSB SEA77FYG11Accident · Serious injuriesClosedHiller Acft UH-12E · Ephrata, WANov 19, 1976 · N5380V · Destroyed NTSB SEA77DYE02Accident · Minor injuriesClosedHiller Acft UH-12E · Brinnon, WAOct 4, 1976 · N2HL · Substantial damage NTSB SEA76DYE65Accident · Serious injuriesClosedHiller Acft UH-12E · Humptulips, WASep 7, 1976 · N48001 · Substantial damage NTSB SEA76DYG73Accident · Minor injuriesClosedHiller Acft UH-12E · Kennewick, WAAug 10, 1976 · N7411N · Substantial damage NTSB SEA7LDYE16Accident · No injuriesClosedHiller Acft UH-12E · Randle, WASep 15, 1975 · N102EH · Destroyed NTSB SEA76DYE14Accident · No injuriesClosedHiller Acft UH-12E · Randle, WASep 5, 1975 · N5344V · Destroyed NTSB SEA76DYE10Accident · No injuriesClosedHiller Acft UH-12E · Forks, WAAug 13, 1975 · N2HL · Substantial damage NTSB SEA75DYE41Accident · Minor injuriesClosedHiller Acft UH-12E · Concrete, WAMay 5, 1975 · N90469 · Destroyed NTSB SEA75FYC33Accident · Minor injuriesClosedHiller Acft UH-12E · Willard, WAApr 3, 1975 · N28877 · Substantial damage NTSB SEA74DYE32Accident · No injuriesClosedHiller UH-12E · Queets, WADec 28, 1973 · N28875 · Destroyed NTSB SEA72FYE03Accident · 1 fatalClosedHiller 12E · Skykomish, WAJul 16, 1971 · N9749C · Destroyed NTSB SEA70FWG02Accident · No injuriesClosedHiller Acft UH-12E · Colfax, WAFeb 23, 1970 · N90465 · Substantial damage NTSB SEA65A0039Accident · No injuriesClosedHiller UH12E · Centerville, WAJan 12, 1965 · N5367V · Substantial damage NTSB UNK64X1354Accident · No injuriesClosedHiller 12E · Pomeroy, WAApr 17, 1964 · N9785C · Substantial damage