# NTSB investigations: Hiller UH-12E 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. Page 2 of 9 · 415 cases ## Cases, newest first - [NTSB LAX00LA027](https://openairdocs.org/ntsb/LAX00LA027.md): Hiller UH-12E · Castroville, CA · Accident · Serious injuries · Limited investigation · Final report · Oct 28, 1999 · N5374V · Substantial damage > The pilot's inadequate visual lookout and diverted attention. - [NTSB LAX99LA237](https://openairdocs.org/ntsb/LAX99LA237.md): Hiller UH-12ET · Williams, CA · Accident · No injuries · Limited investigation · Final report · Jun 30, 1999 · N7173F · Substantial damage > The pilot's inadequate preflight planning and verification that fuel was available for the intended flight. A factor was the fuel quantity false indication. - [NTSB SEA99FA037](https://openairdocs.org/ntsb/SEA99FA037.md): Hiller UH-12E · Yellow Pine, ID · Accident · No injuries · Field investigation · Final report · Feb 28, 1999 · N2239 · Substantial damage > Altitude deviation during aerial taxi for undetermined reasons. - [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 SEA99LA031](https://openairdocs.org/ntsb/SEA99LA031.md): Hiller UH-12E · Tensed, ID · Accident · Serious injuries · Limited investigation · Final report · Jan 19, 1999 · N67264 · Substantial damage > The pilot-in-command's inadequate fuel management which resulted in fuel exhaustion. Contributing factors were the absence of cautionary markings on the fuel gauge, and high trees at the accident site. - [NTSB SEA99LA022](https://openairdocs.org/ntsb/SEA99LA022.md): Hiller UH-12E · Wenatchee, WA · Accident · No injuries · Limited investigation · Final report · Dec 17, 1998 · N893FW · Substantial damage > Fuel exhaustion due to the pilot's failure to accomplish refueling. - [NTSB SEA99FA013](https://openairdocs.org/ntsb/SEA99FA013.md): Hiller UH-12E · Marshall, WA · Accident · 1 fatal · Field investigation · Final report · Nov 10, 1998 · N752GB · Destroyed > The 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. - [NTSB CHI98LA312](https://openairdocs.org/ntsb/CHI98LA312.md): Hiller UH-12E · Shelton, NE · Accident · Serious injuries · Limited investigation · Final report · Aug 14, 1998 · N88782 · Substantial damage > The pilot mismanaged the fuel which led to fuel starvation and subsequent loss of engine power. - [NTSB SEA98LA124](https://openairdocs.org/ntsb/SEA98LA124.md): Hiller UH-12E · Eltopia, WA · Accident · Minor injuries · Limited investigation · Final report · Jul 7, 1998 · N5360V · Destroyed > Fatigue of the control rotor blade spar and failure of the maintenance inspector to follow the procedures set forth in the airworthiness directive. - [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 FTW98LA253](https://openairdocs.org/ntsb/FTW98LA253.md): Hiller UH-12E · Delaplaine, AR · Accident · No injuries · Limited investigation · Final report · Jun 2, 1998 · N4028T · Substantial damage > The failure of maintenance personnel to comply with and airworthiness directive, which resulted in failure of the planetary gear due to lack of lubrication. A contributing factors was the lack of suitable terrain for the pilot to execute a forced landing. - [NTSB LAX98LA089](https://openairdocs.org/ntsb/LAX98LA089.md): Hiller UH-12E · Chico, CA · Accident · No injuries · Limited investigation · Final report · Feb 13, 1998 · N4027Z · Substantial damage > Fuel exhaustion due to the pilot's failure to ensure that an adequate fuel supply was onboard. A contributing factor was related to the fuel quantity gage's erroneous indication of fuel. - [NTSB CHI98LA012](https://openairdocs.org/ntsb/CHI98LA012.md): Hiller UH-12E · Liberty, NE · Accident · No injuries · Limited investigation · Final report · Oct 9, 1997 · N4027L · Substantial damage > A loss of engine power for undetermined reasons. - [NTSB NYC97LA101](https://openairdocs.org/ntsb/NYC97LA101.md): Hiller UH-12E · Granby, NY · Accident · Serious injuries · Limited investigation · Final report · May 29, 1997 · N4029S · Substantial damage > failure of the pilot/owner to replace the torsional clutch as specified by the manufacturer, and subsequent failure of the helicopter's clutch, which resulted in a forced landing (autorotation). A related factor was: the encounter with trees in the emergency… - [NTSB SEA97LA117](https://openairdocs.org/ntsb/SEA97LA117.md): Hiller UH-12E · Miltonfreewater, OR · Accident · 1 fatal · Limited investigation · Final report · May 21, 1997 · N3005J · Substantial damage > The main rotor blade separated due to fatigue. Factors were: an Airworthiness Directive was not properly performed, and inadequate inspection of the main rotor blades. - [NTSB LAX97LA179](https://openairdocs.org/ntsb/LAX97LA179.md): Hiller UH-12E · Truckee, CA · Accident · Serious injuries · Limited investigation · Final report · May 14, 1997 · N7082D · Substantial damage > A loss of engine power for undetermined reasons. A factor in the accident was the unsuccessful attempt to release the long line from the belly hook after it became entangled in a tree. - [NTSB FTW97LA131](https://openairdocs.org/ntsb/FTW97LA131.md): Hiller UH-12E · Donna, TX · Accident · Serious injuries · Limited investigation · Final report · Mar 19, 1997 · N136HA · Substantial damage > The pilot's failure to maintain clearance with the power lines during an aerial application flight. A factor was the power lines. - [NTSB SEA97LA072](https://openairdocs.org/ntsb/SEA97LA072.md): Hiller UH-12E · Glide, OR · Accident · Minor injuries · Limited investigation · Final report · Mar 14, 1997 · N545HA · Substantial damage > failure of the pilot to maintain clearance from a power transmission line. Factors relating to the accident included ambient light conditions, which made the power line hard to see. - [NTSB FTW96LA385](https://openairdocs.org/ntsb/FTW96LA385.md): Hiller UH12E · Hamburg, AR · Accident · Minor injuries · Limited investigation · Final report · Sep 12, 1996 · N156HA · Substantial damage > The loss of tail rotor control as result of a tail rotor blade strike by a partially disconnected ballast weight, due to a disconnected pin. A factor was the lack of suitable terrain for the forced landing. - [NTSB FTW96LA315](https://openairdocs.org/ntsb/FTW96LA315.md): Hiller UH-12E · Mount Holly, AR · Accident · Serious injuries · Limited investigation · Final report · Jul 24, 1996 · N9743C · Substantial damage > Fuel exhaustion due to the pilot's failure to refuel the helicopter. A factor was the lack of suitable terrain for the forced landing. - [NTSB LAX96LA279](https://openairdocs.org/ntsb/LAX96LA279.md): Hiller UH-12E · Healdsburg, CA · Accident · No injuries · Limited investigation · Final report · Jul 20, 1996 · N124HA · Substantial damage > The failure of the pilot to confirm a loss of power before entering autorotation after reading an erroneous instrument indication on the helicopter's dual tachometer. Factors in the accident were the erratic instrument, and maintenance personnel who failed to… - [NTSB ATL96LA104](https://openairdocs.org/ntsb/ATL96LA104.md): Hiller UH-12E · Cottondale, FL · Accident · No injuries · Limited investigation · Final report · Jul 11, 1996 · N102HT · Substantial damage > failure of the main rotor drive torsional coupling and inner gimbal ring, which resulted in jamming of the flight controls during an attempted autorotation. - [NTSB FTW96LA285](https://openairdocs.org/ntsb/FTW96LA285.md): Hiller UH12 · Franklin, LA · Accident · No injuries · Limited investigation · Final report · Jul 1, 1996 · N14637 · Substantial damage > loss of engine power for undetermined reasons, and the pilot's failure to maintain rotor RPM. A factor was the unsuitable terrain available for the precautionary landing. - [NTSB SEA96LA100](https://openairdocs.org/ntsb/SEA96LA100.md): Hiller UH-12 · Walla Walla, WA · Accident · No injuries · Limited investigation · Final report · May 27, 1996 · N174HA · Substantial damage > the 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… - [NTSB IAD96LA077](https://openairdocs.org/ntsb/IAD96LA077.md): Hiller UH-12E · Hellam, PA · Accident · Minor injuries · Limited investigation · Final report · May 14, 1996 · N90467 · Substantial damage > the pilot's loss of directional control during aerial application for undetermined reasons. - [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 ATL96LA076](https://openairdocs.org/ntsb/ATL96LA076.md): Hiller UH12-E · Huger, SC · Accident · Serious injuries · Limited investigation · Final report · Apr 3, 1996 · N14MQ · Substantial damage > The blocked fuel vent line that resulted in engine stoppage. A factor was tall trees that intervened the helicopter's flight path. - [NTSB LAX95LA318](https://openairdocs.org/ntsb/LAX95LA318.md): Hiller UH-12E · Dos Palos, CA · Accident · No injuries · Limited investigation · Final report · Sep 1, 1995 · N4027D · Substantial damage > the fatigue failure of the tail rotor tension torsion bar plates. - [NTSB CHI95LA202](https://openairdocs.org/ntsb/CHI95LA202.md): Hiller UH-12E · Blue Rapids, KS · Accident · No injuries · Limited investigation · Final report · Jun 27, 1995 · N1349A · Substantial damage > the leaking drain in the main fuel sump. Factors to the accident were the incorrect fuel indication, the ravine, fuel exhaustion, and the low rotor RPM. - [NTSB SEA95LA077](https://openairdocs.org/ntsb/SEA95LA077.md): Hiller UH-12E · Timber, OR · Accident · Serious injuries · Limited investigation · Final report · Apr 11, 1995 · N508HV · Substantial damage > The pilot's inadequate aircraft preflight during which he failed to notice the main rotor shipping block had not been removed, and the resultant restricted movement of the flight control system. - [NTSB LAX95LA132](https://openairdocs.org/ntsb/LAX95LA132.md): Hiller UH-12E · Five Points, CA · Accident · No injuries · Limited investigation · Final report · Mar 12, 1995 · N172ET · Substantial damage > fuel exhaustion due to the pilot's inattention to the fuel supply. - [NTSB LAX95LA109](https://openairdocs.org/ntsb/LAX95LA109.md): Hiller UH-12E · Arvin, CA · Accident · No injuries · Limited investigation · Final report · Feb 15, 1995 · N5335V · Substantial damage > The seizure of the transmission due to lack of lubrication from a plugged oil supply line. - [NTSB LAX95LA096](https://openairdocs.org/ntsb/LAX95LA096.md): Hiller UH-12E · Chowchilla, CA · Accident · No injuries · Limited investigation · Final report · Feb 3, 1995 · N9293Z · Destroyed > the in-flight failure and separation of the main rotor hub due to a fatigue crack. - [NTSB LAX95LA005](https://openairdocs.org/ntsb/LAX95LA005.md): Hiller UH-12E · Salinas, CA · Accident · Serious injuries · Limited investigation · Final report · Oct 13, 1994 · N145HA · Destroyed > an in-flight engine compartment fire for undetermined reasons. - [NTSB CHI94LA191](https://openairdocs.org/ntsb/CHI94LA191.md): Hiller HU-12E · Watertown, SD · Accident · 1 fatal · Limited investigation · Final report · Jun 23, 1994 · N330CW · Destroyed > the pilot's failure to maintain a visual lookout. A factor associated with the accident was the powerlines. - [NTSB SEA94LA149](https://openairdocs.org/ntsb/SEA94LA149.md): Hiller-Soloy UH-12L4 · Clarkston, WA · Accident · Minor injuries · Limited investigation · Final report · Jun 14, 1994 · N67264 · Substantial damage > Disconnection of the ballast bar aft retaining pin. Factor(s) were: tail rotor blade separation and reduced aircraft control. - [NTSB SEA94T#A01](https://openairdocs.org/ntsb/SEA94T%23A01.md): Hiller UH-12E · Eugene, OR · Accident · No injuries · Class 3 · Final report · May 6, 1994 · N94492 · Substantial damage - [NTSB FTW94LA144](https://openairdocs.org/ntsb/FTW94LA144.md): Hiller UH-12E · Osage, AR · Accident · Minor injuries · Limited investigation · Final report · May 4, 1994 · N90469 · Substantial damage > Fuel exhaustion due to the pilot's failure to refuel and the lack of suitable terrain for a forced landing. - [NTSB BFO94LA040](https://openairdocs.org/ntsb/BFO94LA040.md): Hiller UH-12E · Farmville, VA · Accident · No injuries · Limited investigation · Final report · Feb 14, 1994 · N4495M · Substantial damage > the pilot's failure to refuel the helicopter with the correct fuel. Factors in the accident were the unclear information given by the passenger and airport line service personnel, the insufficient information regarding the labeling of the airport's fuel… - [NTSB MIA94LA029](https://openairdocs.org/ntsb/MIA94LA029.md): Hiller UH-12E · Moore Haven, FL · Accident · Minor injuries · Limited investigation · Final report · Nov 26, 1993 · N130HA · Substantial damage > Failure of the pilot-in-command to maintain aircraft control following loss of engine power for undetermined reasons. - [NTSB LAX94LA054](https://openairdocs.org/ntsb/LAX94LA054.md): Hiller UH-12E · Salinas, CA · Accident · Minor injuries · Limited investigation · Final report · Nov 20, 1993 · N161HA · Substantial damage > a fatigue failure of the torsion-tension bar pin due to fretting corrosion. A factor in this accident was an inadequate quality of material utilized in the manufacture of the pin. - [NTSB LAX94LA043](https://openairdocs.org/ntsb/LAX94LA043.md): Hiller UH-12E · Salinas, CA · Accident · No injuries · Limited investigation · Final report · Nov 13, 1993 · N149HA · Destroyed > The pilot's improper handling of the helicopter which resulted in overloading of the rotor system in a maneuvering turn during aerial application of chemical, and subsequent failure of the main rotor paddle assembly. - [NTSB CHI94LA022](https://openairdocs.org/ntsb/CHI94LA022.md): Hiller UH12E · Sioux Rapids, IA · Accident · No injuries · Limited investigation · Final report · Oct 22, 1993 · N4026S · Destroyed > the Pilot in Command failed to maintain clearance with the terrain while proceeding up an upslope. - [NTSB SEA93LA181](https://openairdocs.org/ntsb/SEA93LA181.md): Hiller UH-12E · Auburn, WA · Accident · No injuries · Limited investigation · Final report · Aug 23, 1993 · N9785C · Substantial damage > Failure of the connecting rod bolt. The high vegetation was a factor. - [NTSB LAX93LA319](https://openairdocs.org/ntsb/LAX93LA319.md): Hiller UH-12E · Dixon, CA · Accident · Serious injuries · Limited investigation · Final report · Aug 11, 1993 · N100LM · Destroyed > the failure of the pilot to visually detect and avoid the guy wire. - [NTSB CHI93DTK02](https://openairdocs.org/ntsb/CHI93DTK02.md): Hiller UH-12E · Milbank, SD · Accident · Minor injuries · Final report · Jul 18, 1993 · N4028M · Destroyed > Undetermined - [NTSB ATL93LA065](https://openairdocs.org/ntsb/ATL93LA065.md): Hiller UH12E · Greeleyville, SC · Accident · No injuries · Limited investigation · Final report · Mar 25, 1993 · N4029Z · Substantial damage > The pilot's misjudgment of the helicopter's altitude during the landing flare. - [NTSB DEN93FA033](https://openairdocs.org/ntsb/DEN93FA033.md): Hiller UH-12E · Applegate, OR · Accident · 3 fatal · Field investigation · Final report · Mar 16, 1993 · N5344V · Destroyed > The pilot initiating flight into known adverse weather. Factors were: low ceiling, fog, and turbulence. - [NTSB SEA93GA052](https://openairdocs.org/ntsb/SEA93GA052.md): Hiller UH-12E · Chinook, MT · Accident · 1 fatal · Final report · Jan 15, 1993 · N28908 · Minor damage > Inattentive FBO personnel. - [NTSB LAX92LA401](https://openairdocs.org/ntsb/LAX92LA401.md): Hiller UH-12E · Coachella, CA · Accident · No injuries · Limited investigation · Final report · Sep 26, 1992 · N57BA · Substantial damage > The pilot's inadequate visual lookout and his failure to maintain an adequate clearance from the wires. Next page: https://openairdocs.org/ntsb.md?model=4360122&page=3 ## 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')) ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC ``` This list as a web page: https://openairdocs.org/ntsb?model=4360122&page=2 --- 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.