# NTSB investigations: Hiller UH-12E, WA

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 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 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 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 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 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 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 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 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 SEA87FA106](https://openairdocs.org/ntsb/SEA87FA106.md): Hiller UH-12E · Shelton, WA · Accident · 1 fatal · Field investigation · Final report · May 28, 1987 · N28875 · Destroyed
  > The pilot was properly certificated for the flight; however, due to operator insurance restrictions, all prior commercial flights had required the owner/operator to accompany this pilot, therefore this was the pilot's first commercial flight as sole pilot.…
- [NTSB SEA85LA031](https://openairdocs.org/ntsb/SEA85LA031.md): Hiller UH-12ET · Hoquiam, WA · Accident · Minor injuries · Limited investigation · Final report · Dec 18, 1984 · N100LM · Substantial damage
  > Plt reported that while in normal cruise flight, a total loss of power occurred. Autorotation was effected in mountainous, wooded terrain. Examination of the engine showed continuity and freedom of rotation. Examination of the fuel system disclosed no…
- [NTSB SEA84LA002](https://openairdocs.org/ntsb/SEA84LA002.md): Hiller UH12-E · Tenino, WA · Accident · No injuries · Limited investigation · Final report · Oct 2, 1983 · N401HA · Substantial damage
  > The plt visually checked the fuel tanks prior to takeoff & thought he had seen fuel in the tanks. The fuel gauges were inoperative & he was using timing as a method to determine the remaining fuel. Aprx 5 min after takeoff, the eng lost power as he was lining…
- [NTSB SEA82DA164](https://openairdocs.org/ntsb/SEA82DA164.md): Hiller-Soloy UH-12E · Spirit Lake, WA · Accident · No injuries · Final report · Sep 15, 1982 · N513HA · Substantial damage
  > Pilot performed autorotation from 2000 feet to check RPM. At 200-300 feet when collective was added power loss occurred. Aircraft landed hard and severed tail boom. Logging support operations.
- [NTSB SEA81DYE11](https://openairdocs.org/ntsb/SEA81DYE11.md): Hiller Acft UH-12E · Beaver, WA · Accident · No injuries · Closed · Jan 7, 1981 · N28875 · Substantial damage
- [NTSB SEA81DYE08](https://openairdocs.org/ntsb/SEA81DYE08.md): Hiller Acft UH-12E · Forks, WA · Accident · No injuries · Closed · Nov 19, 1980 · N542HA · Substantial damage
- [NTSB SEA80DYE32](https://openairdocs.org/ntsb/SEA80DYE32.md): Hiller Acft UH-12E · Forks, WA · Accident · Serious injuries · Closed · May 15, 1980 · N5359V · Destroyed
- [NTSB SEA79FYP31](https://openairdocs.org/ntsb/SEA79FYP31.md): Hiller Acft UH-12E · Quincy, WA · Accident · No injuries · Closed · Jun 29, 1979 · N65048 · Substantial damage
- [NTSB SEA78DYE37](https://openairdocs.org/ntsb/SEA78DYE37.md): Hiller Acft UH-12E · Amanda Park, WA · Accident · Minor injuries · Closed · Sep 25, 1978 · N94519 · Destroyed
- [NTSB SEA78DYP52](https://openairdocs.org/ntsb/SEA78DYP52.md): Hiller Acft UH-12E · Moses Lake, WA · Accident · No injuries · Closed · Sep 9, 1978 · N48121 · Substantial damage
- [NTSB SEA78FYE16](https://openairdocs.org/ntsb/SEA78FYE16.md): Hiller Acft UH-12E · Forks, WA · Accident · No injuries · Closed · Mar 20, 1978 · N5359V · Substantial damage
- [NTSB SEA78FYE11](https://openairdocs.org/ntsb/SEA78FYE11.md): Hiller Acft UH-12E · Montesano, WA · Accident · No injuries · Closed · Mar 6, 1978 · N100LM · Substantial damage
- [NTSB SEA77DYE04](https://openairdocs.org/ntsb/SEA77DYE04.md): Hiller Acft UH-12E · Neilton, WA · Accident · Minor injuries · Closed · Dec 1, 1976 · N93479 · Destroyed
- [NTSB SEA77FYG11](https://openairdocs.org/ntsb/SEA77FYG11.md): Hiller Acft UH-12E · Ephrata, WA · Accident · Serious injuries · Closed · Nov 19, 1976 · N5380V · Destroyed
- [NTSB SEA77DYE02](https://openairdocs.org/ntsb/SEA77DYE02.md): Hiller Acft UH-12E · Brinnon, WA · Accident · Minor injuries · Closed · Oct 4, 1976 · N2HL · Substantial damage
- [NTSB SEA76DYE65](https://openairdocs.org/ntsb/SEA76DYE65.md): Hiller Acft UH-12E · Humptulips, WA · Accident · Serious injuries · Closed · Sep 7, 1976 · N48001 · Substantial damage
- [NTSB SEA76DYG73](https://openairdocs.org/ntsb/SEA76DYG73.md): Hiller Acft UH-12E · Kennewick, WA · Accident · Minor injuries · Closed · Aug 10, 1976 · N7411N · Substantial damage
- [NTSB SEA7LDYE16](https://openairdocs.org/ntsb/SEA7LDYE16.md): Hiller Acft UH-12E · Randle, WA · Accident · No injuries · Closed · Sep 15, 1975 · N102EH · Destroyed
- [NTSB SEA76DYE14](https://openairdocs.org/ntsb/SEA76DYE14.md): Hiller Acft UH-12E · Randle, WA · Accident · No injuries · Closed · Sep 5, 1975 · N5344V · Destroyed
- [NTSB SEA76DYE10](https://openairdocs.org/ntsb/SEA76DYE10.md): Hiller Acft UH-12E · Forks, WA · Accident · No injuries · Closed · Aug 13, 1975 · N2HL · Substantial damage
- [NTSB SEA75DYE41](https://openairdocs.org/ntsb/SEA75DYE41.md): Hiller Acft UH-12E · Concrete, WA · Accident · Minor injuries · Closed · May 5, 1975 · N90469 · Destroyed
- [NTSB SEA75FYC33](https://openairdocs.org/ntsb/SEA75FYC33.md): Hiller Acft UH-12E · Willard, WA · Accident · Minor injuries · Closed · Apr 3, 1975 · N28877 · Substantial damage
- [NTSB SEA74DYE32](https://openairdocs.org/ntsb/SEA74DYE32.md): Hiller UH-12E · Queets, WA · Accident · No injuries · Closed · Dec 28, 1973 · N28875 · Destroyed
- [NTSB SEA72FYE03](https://openairdocs.org/ntsb/SEA72FYE03.md): Hiller 12E · Skykomish, WA · Accident · 1 fatal · Closed · Jul 16, 1971 · N9749C · Destroyed
- [NTSB SEA70FWG02](https://openairdocs.org/ntsb/SEA70FWG02.md): Hiller Acft UH-12E · Colfax, WA · Accident · No injuries · Closed · Feb 23, 1970 · N90465 · Substantial damage
- [NTSB SEA65A0039](https://openairdocs.org/ntsb/SEA65A0039.md): Hiller UH12E · Centerville, WA · Accident · No injuries · Closed · Jan 12, 1965 · N5367V · Substantial damage
- [NTSB UNK64X1354](https://openairdocs.org/ntsb/UNK64X1354.md): Hiller 12E · Pomeroy, WA · Accident · No injuries · Closed · Apr 17, 1964 · N9785C · 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" = 'WA' 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=WA

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