# NTSB investigations: Hiller UH-12E, MN NTSB aviation accident and incident investigations since 1962: the probable cause, findings, aircraft, crew, weather and docket of each, linked to the FAA registry and the FAA’s own reports. ## Latest cases - [NTSB CEN22LA318](https://openairdocs.org/ntsb/CEN22LA318.md): Hiller UH12E · Becker, MN · Accident · Serious injuries · Class 3 · Limited · Final report · Jul 6, 2022 · N64272 · Substantial damage > The in-flight failure of the main rotor mast hub due to several undetected fatigue fractures. - [NTSB CHI08CA252](https://openairdocs.org/ntsb/CHI08CA252.md): Hiller UH-12E · Cokato, MN · Accident · No injuries · Data collection · Final report · Aug 15, 2008 · N945HA · Substantial damage > The pilot did not visually identify and maintain clearance with the power lines, and the pilot's inability to maintain control of the helicopter once it contacted the power lines. Factors associated with the accident were the low altitude operations being… - [NTSB CHI98LA218](https://openairdocs.org/ntsb/CHI98LA218.md): Hiller UH-12E · Park Rapids, MN · Accident · No injuries · Limited investigation · Final report · Jun 24, 1998 · N86663 · Substantial damage > the pilot's failure to maintain control of aircraft. Factors were the congested helipad conditions and wind gusts. - [NTSB CHI96LA151](https://openairdocs.org/ntsb/CHI96LA151.md): Hiller UH-12E · Big Lake, MN · Accident · Minor injuries · Limited investigation · Final report · May 4, 1996 · N177HA · Substantial damage > the pilot's inadequate preflight of the helicopter by not having removed a tiedown strap before attempting takeoff. - [NTSB CHI88DER06](https://openairdocs.org/ntsb/CHI88DER06.md): Hiller UH-12E · Buffalo Lake, MN · Accident · No injuries · Final report · Jul 30, 1988 · N173HA · Destroyed > When the helicopter lifted off, the left tail rotor cable separated. Directional control was lost and the aircraft collided with the terrain. The pilot reported no injuries, however the helicopter sustained substantial damage. An inspection of the left tail… - [NTSB CHI87DER03](https://openairdocs.org/ntsb/CHI87DER03.md): Hiller UH-12ET · Big Lake, MN · Accident · No injuries · Final report · Apr 3, 1987 · N135HA · Substantial damage > Aircraft was being maneuvered for landing on a ground support trailer when it experienced a power failure. Due to high trees autorotation was made to adjacent field. Aircraft landed on rough/uneven terrain and rolled over. Investigation revealed contaminated… - [NTSB CHI83LA321](https://openairdocs.org/ntsb/CHI83LA321.md): Hiller UH-12E · Brooklyn Park, MN · Accident · No injuries · Limited investigation · Final report · Jul 18, 1983 · N120NR · Substantial damage > The plt reported that he was spraying the end rows of a field when the helicopter approached some wires. He stated that he saw the wires at the last second & tried to get under them. Reportedly, the helicopter crossed below a set of power lines, but struck a… - [NTSB CHI83LA297](https://openairdocs.org/ntsb/CHI83LA297.md): Hiller UH-12E · Brooten, MN · Accident · No injuries · Limited investigation · Final report · Jul 5, 1983 · N4028K · Substantial damage > The helicopter had just lifted off of the flatbed of a truck when it started to spin. The plt lowered the collective, reduced the power & landed beside the truck. During touchdown, the main rotor blades struck the truck. An investigation revealed that the… - [NTSB CHI82DA301](https://openairdocs.org/ntsb/CHI82DA301.md): Hiller 12E · Palisade, MN · Accident · No injuries · Final report · Aug 10, 1982 · N5594N · Substantial damage > Aircraft lost power, pilot autorotated at 20 feet AGL. Made hard forced landing and aircraft rolled over. Piston rod failed because cap bolt was undertorqued. - [NTSB CHI82DA162](https://openairdocs.org/ntsb/CHI82DA162.md): Hiller 12E · Benson, MN · Accident · No injuries · Final report · May 12, 1982 · N4030C · Substantial damage > Helicopter flying at 250 feet to stay below clouds had engine failure. Landed downwind in muddy field. Right skid collapsed. - [NTSB CHI81FER59](https://openairdocs.org/ntsb/CHI81FER59.md): Hiller Acft UH-12E · Glyndon, MN · Accident · No injuries · Closed · Jul 20, 1981 · N5594N · Substantial damage - [NTSB MKC78DER39](https://openairdocs.org/ntsb/MKC78DER39.md): Hiller UH-12E · Bemidji, MN · Accident · No injuries · Closed · Apr 13, 1978 · N61CW · Substantial damage - [NTSB MKC78DER08](https://openairdocs.org/ntsb/MKC78DER08.md): Hiller UH-12E · Bemidji, MN · Accident · No injuries · Closed · Nov 14, 1977 · N8286 · Substantial damage - [NTSB MKC77FER39](https://openairdocs.org/ntsb/MKC77FER39.md): Hiller Acft UH-12E · Big Lake, MN · Accident · Serious injuries · Closed · May 2, 1977 · N155HA · Substantial damage ## The whole list in SQL Runs in DuckDB 1.2 or later on the release's Parquet files over HTTPS: ```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" = 'MN' 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 ``` This list as a web page: https://openairdocs.org/ntsb?model=4360122&state=MN --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.