# NTSB investigations: Hiller UH-12E

A list on [Hiller UH-12E](https://openairdocs.org/model/hiller-uh-12e.md).

Matched to the registry by N-number and event date, newest first.

Page 1 of 9 · 415 investigations

- [NTSB CEN26LA175](https://openairdocs.org/ntsb/CEN26LA175.md): Hiller UH-12E · Chickasha, OK · Accident · No injuries · Class 3 · Limited · Preliminary report · Apr 30, 2026 · N22SP · Substantial damage
  > On April 30, 2026, about 1730 central daylight time, a Hiller UH-12E, N22SP, was substantially damaged when it was involved in an accident near Chickasha, Oklahoma. The pilot was not injured. The helicopter was operated as a Title 14 Code of Federal…
- [NTSB WPR25LA246](https://openairdocs.org/ntsb/WPR25LA246.md): Hiller UH-12E · Fobes Hill, WA · Accident · No injuries · Class 4 · Limited · Final report · Aug 11, 2025 · N703WA · Substantial damage
  > The pilot’s abrupt maneuver to avoid a powerline during an aerial application flight, which resulted in the helicopter’s impact with terrain.
- [NTSB CEN25LA143](https://openairdocs.org/ntsb/CEN25LA143.md): Hiller UH12-ET · Ruston, LA · Accident · No injuries · Class 4 · Limited · Final report · Mar 25, 2025 · N6006K · Substantial damage
  > The pilot’s improper fuel planning and fuel management, which resulted in a total loss of engine power due to fuel exhaustion and subsequent impact with terrain during an autorotation.
- [NTSB WPR24LA262](https://openairdocs.org/ntsb/WPR24LA262.md): Hiller UH-12E · Bonners Ferry, ID · Accident · No injuries · Class 4 · Limited · Final report · Jul 24, 2024 · N3375T · Substantial damage
  > The pilot’s improper selection of a landing site, which resulted in a main rotor strike. Contributing to the accident was the pilot’s improper performance planning and altitude selection over water, which resulted in an rpm droop.
- [NTSB WPR22LA245](https://openairdocs.org/ntsb/WPR22LA245.md): Hiller UH-12E · Wenatchee, WA · Accident · Serious injuries · Class 4 · Limited · Final report · Jul 6, 2022 · N130HA · Destroyed
  > The pilot’s failure to maintain clearance from power lines during low-level operations in light rain conditions.
- [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 ERA21LA386](https://openairdocs.org/ntsb/ERA21LA386.md): Hiller UH-12E · Millen, GA · Accident · Minor injuries · Class 3 · Limited · Final report · Sep 29, 2021 · N430NR · Substantial damage
  > The improper reassembly of the tail rotor gearbox following maintenance, which resulted in fatigue failure of the input pinion gear shaft, and the subsequent loss of tail rotor drive.
- [NTSB WPR21LA354](https://openairdocs.org/ntsb/WPR21LA354.md): Hiller UH-12E · Bovill, ID · Accident · No injuries · Class 3 · Limited · Final report · Sep 23, 2021 · N5334V · Substantial damage
  > A loss of helicopter control for undetermined reasons based on the available evidence for this accident.
- [NTSB CEN20LA073](https://openairdocs.org/ntsb/CEN20LA073.md): Hiller UH 12E · Dinosaur, CO · Accident · No injuries · Class 3 · Limited · Final report · Feb 1, 2020 · N7173S · Substantial damage
  > Failure of a S4 compressor blade due to a fatigue crack that likely initiated at a corrosion pit. Contributing to the accident was maintenance personnel’s failure to detect the corrosion pits during maintenance.
- [NTSB WPR20LA007](https://openairdocs.org/ntsb/WPR20LA007.md): Hiller UH 12E · Susanville, CA · Accident · Minor injuries · Class 3 · Limited · Final report · Oct 14, 2019 · N131HA · Substantial damage
  > A partial loss of engine power due to multiple overtemperature events and a hot start event, which resulted in thermally damaged internal components of the engine. Contributing to the accident was the lack of suitable terrain on which to perform the forced…
- [NTSB GAA18CA573](https://openairdocs.org/ntsb/GAA18CA573.md): Hiller UH 12E · Frankfort, KS · Accident · No injuries · Data collection · Final report · Sep 20, 2018 · N1349A · Substantial damage
  > The ground crewmember's improper grabbing of the hovering helicopter's skid during an external load hook-up, which resulted in the helicopter descending and the main rotors striking ground equipment.
- [NTSB WPR15LA168](https://openairdocs.org/ntsb/WPR15LA168.md): Hiller UH 12E · Wasco, CA · Accident · 1 fatal · Limited investigation · Final report · May 27, 2015 · N138HA · Substantial damage
  > An in-flight impact with terrain for reasons that could not be determined based on available evidence.
- [NTSB WPR15LA138](https://openairdocs.org/ntsb/WPR15LA138.md): Hiller UH 12E · Firebaugh, CA · Accident · No injuries · Limited investigation · Final report · Mar 29, 2015 · N130HA · Substantial damage
  > A loss of engine power for reasons that could not be determined because postaccident examination of the engine did not reveal any anomalies that would have precluded normal operation.
- [NTSB ERA14LA405](https://openairdocs.org/ntsb/ERA14LA405.md): Hiller UH 12E · Cape May Court House, NJ · Accident · Minor injuries · Limited investigation · Final report · Aug 25, 2014 · N4035A · Substantial damage
  > The mechanic’s failure to detect excessive wear on the engine’s lateral snubber vibration mount during the latest annual inspection, which resulted in an in-flight engine failure and a subsequent forced landing.
- [NTSB ERA14LA361](https://openairdocs.org/ntsb/ERA14LA361.md): Hiller UH 12E · Wadesboro, NC · Accident · No injuries · Limited investigation · Final report · Jul 26, 2014 · N107HA · Substantial damage
  > A partial loss of engine power due to the failure of the No. 2 engine accessory gearbox bearing for reasons that could not be determined based on the available information.
- [NTSB WPR14LA062](https://openairdocs.org/ntsb/WPR14LA062.md): Hiller UH 12E · Chowchilla, CA · Accident · No injuries · Limited investigation · Final report · Dec 9, 2013 · N36MV · Substantial damage
  > The failure of the torsional drive coupling, which resulted in a loss of drive to the main rotor system during low-altitude flight.
- [NTSB WPR11LA267](https://openairdocs.org/ntsb/WPR11LA267.md): Hiller UH-12E · Lost Hills, CA · Accident · Minor injuries · Limited investigation · Final report · Jun 19, 2011 · N138HA · Substantial damage
  > The failure of the engine-driven fuel pump, resulting in the loss of all engine power and the pilot's failure to correctly execute an autorotational landing.
- [NTSB WPR11LA244](https://openairdocs.org/ntsb/WPR11LA244.md): Hiller UH-12E · Stockton, CA · Accident · No injuries · Limited investigation · Final report · Jun 1, 2011 · N68012 · Substantial damage
  > The pilot's failure to maintain clearance from obstacles.
- [NTSB ERA11LA216](https://openairdocs.org/ntsb/ERA11LA216.md): Hiller UH-12E · Culpeper, VA · Accident · No injuries · Limited investigation · Final report · Mar 25, 2011 · N4033P · Substantial damage
  > Mechanical failure of the transmission for reasons that could not be determined because the transmission could not be torn down.
- [NTSB WPR11CA146](https://openairdocs.org/ntsb/WPR11CA146.md): Hiller UH-12E · Colusa, CA · Accident · No injuries · Data collection · Final report · Feb 26, 2011 · N236HA · Substantial damage
  > The pilot's failure to maintain an adequate airspeed and an inadvertent encounter with settling with power while flying downwind.
- [NTSB WPR10CA466](https://openairdocs.org/ntsb/WPR10CA466.md): Hiller UH-12E · Mecca, CA · Accident · Minor injuries · Data collection · Final report · Sep 21, 2010 · N6053H · Substantial damage
  > The pilot's failure to maintain clearance from an obstacle while maneuvering.
- [NTSB WPR10FA440](https://openairdocs.org/ntsb/WPR10FA440.md): Hiller UH 12E · Kamiah, ID · Accident · 3 fatal · Field investigation · Final report · Aug 31, 2010 · N67264 · Substantial damage
  > In-flight impact of a passenger's metal clipboard with the helicopter’s tail rotor, which resulted in destruction of the tail rotor and subsequent loss of control of the helicopter. The original location of the clipboard and how it became free could not be…
- [NTSB ERA10LA383](https://openairdocs.org/ntsb/ERA10LA383.md): Hiller UH-12E · Holly Hill, SC · Accident · Serious injuries · Limited investigation · Final report · Jul 29, 2010 · N104HH · Substantial damage
  > Maintenance personnel's improper inspection and cleaning of the fuel nozzle, which resulted in a total loss of engine power.
- [NTSB CEN10CA362](https://openairdocs.org/ntsb/CEN10CA362.md): Hiller UH-12E · Grand Junction, CO · Accident · Minor injuries · Data collection · Final report · Jun 25, 2010 · N9754C · Substantial damage
  > The total loss of engine power for undetermined reasons.
- [NTSB WPR10LA127](https://openairdocs.org/ntsb/WPR10LA127.md): Hiller UH-12E · Los Banos, CA · Accident · No injuries · Limited investigation · Final report · Feb 2, 2010 · N36MV · Substantial damage
  > A partial loss of engine power due to a failure of the throttle interconnect hardware, which resulted in a hard landing.
- [NTSB WPR10CA094](https://openairdocs.org/ntsb/WPR10CA094.md): Hiller UH-12E · Tipton, CA · Accident · Minor injuries · Data collection · Final report · Jan 1, 2010 · N440NR · Substantial damage
  > The pilot's failure to maintain clearance from terrain.
- [NTSB CEN09CA359](https://openairdocs.org/ntsb/CEN09CA359.md): Hiller UH-12E · Stringtown, OK · Accident · No injuries · Data collection · Final report · Jun 11, 2009 · N34SD · Substantial damage
  > The pilot's failure to maintain clearance from power lines. Contributing to the accident was the pilot's preoccupation with personal affairs.
- [NTSB WPR09LA028](https://openairdocs.org/ntsb/WPR09LA028.md): Hiller UH-12E · Powder River, WY · Accident · Minor injuries · Limited investigation · Final report · Oct 30, 2008 · N61436 · Substantial damage
  > A flight control system malfunction while the helicopter was maneuvering at low altitude due to the failure/separation of the rotor blade control tube.
- [NTSB NYC08LA318](https://openairdocs.org/ntsb/NYC08LA318.md): Hiller UH-12E · Naruna, VA · Accident · No injuries · Limited investigation · Final report · Sep 16, 2008 · N3324F · Substantial damage
  > The fatigue failure of a main rotor blade drag strut.
- [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 DFW08LA100](https://openairdocs.org/ntsb/DFW08LA100.md): Hiller UH-12E · Quinton, OK · Accident · No injuries · Limited investigation · Final report · Apr 7, 2008 · N34SD · Substantial damage
  > An undetermined mechanical malfuction associated with the tail rotor drive system which led to a loss of control.
- [NTSB DEN08LA071](https://openairdocs.org/ntsb/DEN08LA071.md): Hiller UH-12E · La Porte, TX · Accident · Minor injuries · Limited investigation · Final report · Apr 4, 2008 · N40289 · Substantial damage
  > The loss of tail rotor effectiveness. Contributing factors were the sudden windshift to a tailwind, and the pilot initiating a hovering turn in ground effect.
- [NTSB SEA08LA038](https://openairdocs.org/ntsb/SEA08LA038.md): Hiller UH-12E · Yuma, AZ · Accident · No injuries · Limited investigation · Final report · Nov 24, 2007 · N104EA · Substantial damage
  > Fatigue fracture of the control rotor blade spar and failure of maintenance personnel to follow maintenance directives.
- [NTSB ANC07LA062](https://openairdocs.org/ntsb/ANC07LA062.md): Hiller UH-12E · Skwentna, AK · Accident · No injuries · Limited investigation · Final report · Jul 10, 2007 · N146ET · Substantial damage
  > The pilot's failure to maintain clearance from a glacier, which resulted in a tail rotor strike during landing, and damage to the helicopter during an emergency descent/landing on rough/uneven terrain. Factors contributing to the accident were variable and…
- [NTSB DFW06CA013](https://openairdocs.org/ntsb/DFW06CA013.md): Hiller UH-12E · Pasadena, TX · Accident · Serious injuries · Data collection · Final report · Oct 23, 2005 · N909BC · Substantial damage
  > The pilot's inadequate fuel management, which resulted in fuel exhaustion and a loss of engine power. A contributing factor was the lack of suitable terrain for the forced landing.
- [NTSB LAX05CA313](https://openairdocs.org/ntsb/LAX05CA313.md): Hiller UH 12-E · Five Points, CA · Accident · No injuries · Data collection · Final report · Sep 22, 2005 · N141HA · Substantial damage
  > The pilot's failure to refuel the helicopter, which resulted in fuel exhaustion.
- [NTSB DFW05CA208](https://openairdocs.org/ntsb/DFW05CA208.md): Hiller UH-12E · Hampton, AR · Accident · Serious injuries · Data collection · Final report · Aug 10, 2005 · N535HA · Substantial damage
  > A loss of engine power due to fuel exhaustion as a result of the pilot's failure to refuel. A factor was unsuitable terrain to complete a successful autorotation.
- [NTSB SEA05CA104](https://openairdocs.org/ntsb/SEA05CA104.md): Hiller UH-12E · Estacada, OR · Accident · Minor injuries · Data collection · Final report · May 23, 2005 · N3030H · Substantial damage
  > The failure of the pilot to maintain landing skid clearance during hover taxi, which resulted in a dynamic rollover. A factor was the gusty wind condition.
- [NTSB SEA04LA073](https://openairdocs.org/ntsb/SEA04LA073.md): Hiller UH-12E · Haines, OR · Accident · Minor injuries · Limited investigation · Final report · Apr 26, 2004 · N9785C · Substantial damage
  > A momentary partial loss of power for undetermined reason(s) and the pilot's failure to maintain adequate RPM during his autorotation landing.
- [NTSB LAX03CA284](https://openairdocs.org/ntsb/LAX03CA284.md): Hiller UH12E · Kekaha, HI · Accident · No injuries · Data collection · Final report · Sep 9, 2003 · N9792C · Substantial damage
  > the pilot's failure to maintain clearance with the wires due to an inadequate visual lookout.
- [NTSB CHI03LA185](https://openairdocs.org/ntsb/CHI03LA185.md): Hiller UH-12E · Elk Mound, WI · Accident · Minor injuries · Limited investigation · Final report · Jun 27, 2003 · N62417 · Destroyed
  > The pilot's failure to maintain clearance from the terrain. Factors contributing to the accident were the whirlwind, the turbulence, and the helicopter's low altitude.
- [NTSB DEN03LA092](https://openairdocs.org/ntsb/DEN03LA092.md): Hiller UH-12E · Cheyenne, WY · Accident · No injuries · Limited investigation · Final report · May 30, 2003 · N508SQ · Substantial damage
  > the pilot's failure to maintain aircraft control. A contributing to the accident was the sudden tailwind encountered.
- [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 ATL02LA044](https://openairdocs.org/ntsb/ATL02LA044.md): Hiller UH12E · Miami, FL · Accident · Minor injuries · Limited investigation · Final report · Feb 11, 2002 · N103HA · Substantial damage
  > Fatigue cracking in the main rotor hub that resulted in the separation of the main rotor system. A factor was corrosive deposits on the exposed portion of the plate set pin.
- [NTSB CHI01LA238](https://openairdocs.org/ntsb/CHI01LA238.md): Hiller UH-12E · Hastings, NE · Accident · No injuries · Limited investigation · Final report · Jul 25, 2001 · N67067 · Substantial damage
  > Aircraft control not being maintained by the pilot which resulted in the encountered settling with power flight condition during the initial climb. Factors to the accident were the reported variable winds during the takeoff and the corn crop.
- [NTSB LAX01LA245](https://openairdocs.org/ntsb/LAX01LA245.md): Hiller UH-12E · Blythe, CA · Accident · No injuries · Limited investigation · Final report · Jul 13, 2001 · N9281P · Substantial damage
  > The selection by the pilot of an unsuitable precautionary landing site on soft, uneven terrain, which resulted in a rollover.
- [NTSB MIA01LA055](https://openairdocs.org/ntsb/MIA01LA055.md): Hiller UH-12E · Cleveland, TN · Accident · No injuries · Limited investigation · Final report · Jan 5, 2001 · N112EC · Destroyed
  > The PIC's failure to follow safe operating procedures for the maintenance of the rotorcraft's external aerial application equipment, resulting in inadvertent activation of collective as he egressed the rotorcraft, causing unmanned flight, in-flight break-up,…
- [NTSB ATL00LA043](https://openairdocs.org/ntsb/ATL00LA043.md): Hiller UH-12ET · Stonesboro, SC · Accident · No injuries · Limited investigation · Final report · Apr 20, 2000 · N9762C · Substantial damage
  > The pilot's improper inflight decision not to refuel which resulted in fuel exhaustion and a total loss of engine power.
- [NTSB LAX00LA077](https://openairdocs.org/ntsb/LAX00LA077.md): Hiller UH-12E · Five Points, CA · Accident · No injuries · Limited investigation · Final report · Jan 26, 2000 · N68024 · Substantial damage
  > The pilot's inadequate clearance while maneuvering beneath a telephone line.
- [NTSB SEA00TA013](https://openairdocs.org/ntsb/SEA00TA013.md): Hiller UH-12E · Stites, ID · Accident · Serious injuries · Final report · Nov 2, 1999 · N5388V · Substantial damage
  > Inadequate inspection of the control rotor cuff by a company mechanic and subsequent fatigue fracture of the cuff, resulting in an inflight separation of the control rotor blade. Factors contributing to the accident were: inadequate quality control during…

Next page: https://openairdocs.org/model/hiller-uh-12e/ntsb.md?page=2

## 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_aircrafts.parquet' a JOIN 'https://openairdocs.org/data/latest/ntsb_case_detail.parquet' c ON c."mKey" = a.case_mkey
WHERE a.aircraft_model_code IN ('4360122', '4360137')
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/model/hiller-uh-12e/ntsb

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