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NTSB investigations: Hiller H-23D

24 cases on aircraft the registry lists as Hiller H-23D. 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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19752026

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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."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.aircraft_model_code IN ('4360120')) 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.\"mKey\" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.aircraft_model_code IN ('4360120'))
  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."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.aircraft_model_code IN ('4360120'))
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 ERA25LA167Accident · Serious injuriesClass 3 · LimitedPreliminary reportHiller UH12E · Rockledge, FLOn April 6, 2025, about 1020 eastern daylight time, a Hiller UH-12E, N48263, was substantially damaged when it was involved in an accident near Rockledge, Florida. The private pilot and passenger sustained serious injuries. The helicopter was operated as a…Apr 6, 2025 · N48263 · Substantial damage NTSB LAX00LA107Accident · Minor injuriesLimited investigationFinal reportHiller H-12E · Byron, CAThe pilot's inadequate visual lookout while maneuvering in proximity to wires. A contributing factor was the sun glare, which reduced the wire's conspicuity.Feb 21, 2000 · N61PC · Substantial damage NTSB SEA94LA064Accident · Minor injuriesLimited investigationFinal reportHiller-Soloy H-23D · Seaside, ORThe pilot's improper use of flight controls resulting in settling with power.Feb 23, 1994 · N62413 · Destroyed NTSB MKC90LA138Accident · No injuriesLimited investigationFinal reportHiller 12-E · Watson, MNPilot misjudged his flare and collided with the terrain.Jun 26, 1990 · N62397 · Substantial damage NTSB CHI89DEP07Accident · Minor injuriesFinal reportHiller UH-12E · Blackriverfalls, WIPilot-in-command's failure to jettison the external load followed by his misjudgement of distance to avoid collision with the external load.Jul 20, 1989 · N48313 · Destroyed NTSB LAX87DVD04Accident · No injuriesFinal reportHiller UH-23-D · Brentwood, CADuring an aerial application flight, the tail boom weight separated and contacted the tail rotor. The pilot lost control of the aircraft and collided with a tree and subsequently the terrain. Post acc invest revealed that the 'pip pins' which secure the tail…Aug 5, 1987 · N61PC · Substantial damage NTSB MKC84LA205Accident · No injuriesLimited investigationFinal reportHiller H-23D · Neelyville, MOThe acft rolled over during an emergency landing. The plt claimed that the rotor disengaged at about 30 ft AGL during takeoff. After the accident the upper half of the yoke control was found fractured. A lab report stated that no materialdefects were related…Jul 9, 1984 · N48313 · Destroyed NTSB CHI84LA263Accident · Minor injuriesLimited investigationFinal reportHiller UH 12 D · Deerfield, WIPlt was aware of pwr lines which crossed the field over which he was performing a calibration test. Plt stated that because of sun glare visual contact with the wires was lost. The acft contacted the wires.Jun 26, 1984 · N62362 · Substantial damage NTSB SEA84LA066Accident · No injuriesLimited investigationFinal reportHiller UH-12E · Forest Grove, ORThe plt reported that while hovering, during an external load operation, the eng lost power & blue smoke & flames exited the back of the helicopter. The helicopter then struck trees before coming to rest. During an investigation, the eng started normally &…Mar 12, 1984 · N62377 · Substantial damage NTSB ATL82DA227Accident · No injuriesFinal reportHiller UH12D · Dothan, ALThe pilot calculated his fuel for the flight and determined it adequate for the flight. He drained the fuel sump while the crew was loading fungicide at the loading area. After the spraying was completed, the pilot started his return flight and when over a…Aug 2, 1982 · N79SW · Substantial damage NTSB SEA82DA057Accident · Serious injuriesFinal reportHiller-Soloy 12E · Christmas Valle, ORThe helicopter was being used to string a transmission line. A rope (attach line) was used to connect the helicopter to the transmission line. The rope became detached and the pilot landed to have it reattached. A man, involved in the ground operations,…Apr 23, 1982 · N62377 · Minor damage NTSB SEA81DYE31Accident · Minor injuriesClosedHiller UN-12D · Castle Rock, WAJun 10, 1981 · N62377 · Destroyed NTSB CHI81FCA05Accident · No injuriesClosedHiller UH-12D · Cahokia, ILApr 17, 1981 · N2MJ · Substantial damage NTSB MIA81FA053Accident · Minor injuriesClosedHiller UH-12D · Miami Beach, FLMar 20, 1981 · N62376 · Destroyed NTSB MIA81FKT31Accident · No injuriesClosedHiller Acft UH-12D · Miami, FLMar 8, 1981 · N62362 · Substantial damage NTSB SEA80DYE03Accident · No injuriesClosedHiller Acft UH-12D · Amanda Park, WAOct 29, 1979 · N62377 · Substantial damage NTSB MKC79FTG12Accident · No injuriesClosedHiller UH-12D · Minot, NDJul 21, 1979 · N62397 · Substantial damage NTSB MIA79DKQ10Accident · Minor injuriesClosedHiller UH12D · Drew, MSMay 1, 1979 · N48313 · Substantial damage NTSB LAX77FUM34Accident · No injuriesClosedHiller Acft UH-12E · Calipatria, CAAug 6, 1977 · N62413 · Substantial damage NTSB MIA77FKT05Accident · No injuriesClosedHiller UH-12D · Lake Worth, FLOct 23, 1976 · N62401 · Substantial damage NTSB MKC76FCD47Accident · No injuriesClosedHiller Acft UH-12D · Dallas Center, IAJun 6, 1976 · N79SW · Destroyed NTSB MIA76FKT61Accident · Minor injuriesClosedHiller UH-12D · Miami, FLMar 15, 1976 · N62362 · Substantial damage NTSB MKC76FCD13Accident · Minor injuriesClosedHiller Acft H-23D · Lakewood, IASep 11, 1975 · N79SW · Destroyed NTSB MKC75FCD46Accident · No injuriesClosedHiller Acft H-23D · Nevada, IAJun 16, 1975 · N79SW · Substantial damage