# NTSB investigations: Hiller UH-12E: Loss of engine power(total) - mech failure/malf 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 SEA02LA073](https://openairdocs.org/ntsb/SEA02LA073.md): Hiller UH-12E · Goshen, OR · Accident · No injuries · Limited investigation · Final report · Apr 22, 2002 · N3004T · Substantial damage > The 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 LAX99LA081](https://openairdocs.org/ntsb/LAX99LA081.md): Hiller UH-12E · Lemoore, CA · Accident · No injuries · Limited investigation · Final report · Jan 24, 1999 · N67064 · Substantial damage > The 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 SEA90LA025](https://openairdocs.org/ntsb/SEA90LA025.md): Hiller UH-12E · Raymond, WA · Accident · No injuries · Limited investigation · Final report · Nov 29, 1989 · N9762C · Substantial damage > Loss 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 LAX90DVA01](https://openairdocs.org/ntsb/LAX90DVA01.md): Hiller 12E · Huron, CA · Accident · Serious injuries · Final report · Oct 16, 1989 · N4026G · Substantial damage > The 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 LAX90DUJ03](https://openairdocs.org/ntsb/LAX90DUJ03.md): Hiller UH-12E · Yuma, AZ · Accident · Serious injuries · Final report · Oct 11, 1989 · N689SB · Substantial damage > The 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 NYC88DFJ02](https://openairdocs.org/ntsb/NYC88DFJ02.md): Hiller UH-12E · Cherry Creek, NY · Accident · Minor injuries · Final report · Jun 27, 1988 · N157HA · Substantial damage > The 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 MIA88LA183](https://openairdocs.org/ntsb/MIA88LA183.md): Hiller UH-12E · Gretna, FL · Accident · No injuries · Limited investigation · Final report · Jun 1, 1988 · N4029R · Substantial damage > While 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 DEN88LA046](https://openairdocs.org/ntsb/DEN88LA046.md): Hiller UH-12E · Vernal, UT · Accident · No injuries · Limited investigation · Final report · Jan 2, 1988 · N400AH · Substantial damage > The 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 LAX86FVM06](https://openairdocs.org/ntsb/LAX86FVM06.md): Hiller UH21E · Salinas, CA · Accident · No injuries · Final report · Aug 12, 1986 · N169HA · Substantial damage > The 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 LAX85FA132](https://openairdocs.org/ntsb/LAX85FA132.md): Hiller UH12E · Five Points, CA · Accident · Minor injuries · Field investigation · Final report · Feb 3, 1985 · N5323V · Substantial damage > While 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 MKC84LA128](https://openairdocs.org/ntsb/MKC84LA128.md): Hiller UH-12E · Pocahontas, AR · Accident · No injuries · Limited investigation · Final report · Apr 24, 1984 · N9740C · Destroyed > The 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 SEA84LA034](https://openairdocs.org/ntsb/SEA84LA034.md): Hiller UH-12E · Mapleton, OR · Accident · Minor injuries · Limited investigation · Final report · Jan 5, 1984 · N4027K · Substantial damage > While 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 LAX83LA360](https://openairdocs.org/ntsb/LAX83LA360.md): Hiller 12E · Los Banos, CA · Accident · No injuries · Limited investigation · Final report · Jul 27, 1983 · N9770C · Destroyed > The 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 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. ## 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."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 ``` This list as a web page: https://openairdocs.org/ntsb?model=4360122&occurrence=351 --- 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.