NTSB investigations: Hiller UH-12E
14 cases on aircraft the registry lists as Hiller UH-12E, where the first occurrence was “Loss of engine power(total) - mech failure/malf”. 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
| 1982 | 1 |
|---|---|
| 1983 | 1 |
| 1984 | 2 |
| 1985 | 1 |
| 1986 | 1 |
| 1988 | 3 |
| 1989 | 3 |
| 1999 | 1 |
| 2002 | 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.\"mKey\" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.aircraft_model_code IN ('4360122', '4360137')
AND EXISTS (SELECT 1 FROM 'https://openairdocs.org/data/latest/ntsb_occurrences.parquet' o WHERE o.case_mkey = x.case_mkey AND o.aircrafts_position = x.position AND o.\"occurrenceNumber\" = 1 AND o.\"occurrenceCode\" = 351))
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 ('4360122', '4360137')
AND EXISTS (SELECT 1 FROM 'https://openairdocs.org/data/latest/ntsb_occurrences.parquet' o WHERE o.case_mkey = x.case_mkey AND o.aircrafts_position = x.position AND o."occurrenceNumber" = 1 AND o."occurrenceCode" = 351))
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 SEA02LA073Accident · No injuriesLimited investigationFinal reportHiller UH-12E · Goshen, ORThe failure of company maintenance personnel to identify and replace/repair the degraded exhaust stack. Contributing factors were the mis-rigged carburetor heat control and the pilot's failure to maintain appropriate rotor RPM. Additional contributing factors…NTSB LAX99LA081Accident · No injuriesLimited investigationFinal reportHiller UH-12E · Lemoore, CAThe inadequate nature of the operator's maintenance, which failed to detect the primer and magneto discrepancies. An overly lean fuel mixture and/or magneto cross firing resulted in detonation, an ensuing connecting rod failure, and a total loss of engine…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.NTSB LAX90DVA01Accident · Serious injuriesFinal reportHiller 12E · Huron, CAThe pilot failed to properly preflight the airplane before departing on the accident flight and misjudged the flare during the ensuing autorotation. Factors relating to this accident were oil starvation and total failure of the connecting rod.NTSB LAX90DUJ03Accident · Serious injuriesFinal reportHiller UH-12E · Yuma, AZThe pilot misjudged the flare altitude. Contributing to this accident was the failure of the engine torsional coupling which ultimately caused the total loss of power.NTSB NYC88DFJ02Accident · Minor injuriesFinal reportHiller UH-12E · Cherry Creek, NYThe pilot reported that during an aerial application operation, he heard a noise that was followed by a decay in rotor RPM. Subsequently, he was forced to land in an area of tall trees & the helicopter was damaged. An investigationrevealed that a connecting…NTSB MIA88LA183Accident · No injuriesLimited investigationFinal reportHiller UH-12E · Gretna, FLWhile on an aerial application flt, the plt stated he maneuvered the helicopter to release the remaining chemical. He then heard a loud 'screeching' noise followed by silence as the eng quit. The helicopter landed hard breaking the skids. It came to rest on…NTSB DEN88LA046Accident · No injuriesLimited investigationFinal reportHiller UH-12E · Vernal, UTThe commercial plt and two passengers were surveying a road route in mountainous terrain. At cruise, the pilot noticed a drop in manifold pressure, followed by a loss of oil pressure. The plt reported that the engine quit. An autorotation to a snow covered…NTSB LAX86FVM06Accident · No injuriesFinal reportHiller UH21E · Salinas, CAThe plt experienced a 'ratcheting' to the right and a decrease in rotor RPM during cruise flt at 75-100 ft AGL. The plt made an autorotation but could not cushion the landing due to the low alt and lack of rotor RPM. The helicopter impacted hard and…NTSB LAX85FA132Accident · Minor injuriesField investigationFinal reportHiller UH12E · Five Points, CAWhile performing an ag flight the helicopter's engin suddenly lost power. At the time the aircraft was near its max allowable gross weight and it was between 3-5FT AGL. As the aircraft yawed left and descended. The pilot in command attempted to land on a…NTSB MKC84LA128Accident · No injuriesLimited investigationFinal reportHiller UH-12E · Pocahontas, ARThe acft crashed after an engine failure during a swath run at an alt of 20 ft AGL. Examination of the engine revealed 3 dowel pins and 6 screws which hold the starter drive gear and the accessory drive gear had sheared. Metallurgical exam revealed that dowel…NTSB SEA84LA034Accident · Minor injuriesLimited investigationFinal reportHiller UH-12E · Mapleton, ORWhile approaching the spray area, the acft was in a level attitude at 20 to 25 mph & about 100 ft AGL when the plt heard a loud bang & noted a loss of power. He attempted an autorotative landing. During touchdown on hilly terrain, the acft rolled to the right…NTSB LAX83LA360Accident · No injuriesLimited investigationFinal reportHiller 12E · Los Banos, CAThe plt had dropped off a flagman in an area to be sprayed, & had just departed & obtained translational lift when the eng lost power. The acft touched down in a freshly irrigated cotton field, rolled over inverted & burst into flames. The 'b' nut which…NTSB CHI82DA301Accident · No injuriesFinal reportHiller 12E · Palisade, MNAircraft lost power, pilot autorotated at 20 feet AGL. Made hard forced landing and aircraft rolled over. Piston rod failed because cap bolt was undertorqued.