# NTSB investigations: Lycoming VO-540 series, 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 WPR10CA283](https://openairdocs.org/ntsb/WPR10CA283.md): Bell 47G-4A · Shaw Island, WA · Accident · No injuries · Data collection · Final report · Jun 8, 2010 · N7069J · Substantial damage
  > The passenger's inadvertent movement of the mixture control during climb, resulting in a loss of engine power.
- [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 SEA97LA191](https://openairdocs.org/ntsb/SEA97LA191.md): Bell 47G · Wellpinit, WA · Accident · Minor injuries · Limited investigation · Final report · Aug 17, 1997 · N9571 · Substantial damage
  > The pilot's selection of an unsuitable landing site, and his failure to maintain rotor blade clearance from terrain during 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 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 SEA81FA035](https://openairdocs.org/ntsb/SEA81FA035.md): Bell 47G-4A · Aberdeen, WA · Accident · 2 fatal · Closed · May 19, 1981 · N9457 · Destroyed
- [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 SEA77DYE04](https://openairdocs.org/ntsb/SEA77DYE04.md): Hiller Acft UH-12E · Neilton, WA · Accident · Minor injuries · Closed · Dec 1, 1976 · N93479 · Destroyed
- [NTSB SEA7LDYE16](https://openairdocs.org/ntsb/SEA7LDYE16.md): Hiller Acft UH-12E · Randle, WA · Accident · No injuries · Closed · Sep 15, 1975 · N102EH · Destroyed
- [NTSB SEA74AS030](https://openairdocs.org/ntsb/SEA74AS030.md): Bell 47G-4A · Wapato, WA · Accident · 1 fatal · Closed · Jan 20, 1974 · N1396X · Destroyed
- [NTSB SEA72FYE03](https://openairdocs.org/ntsb/SEA72FYE03.md): Hiller 12E · Skykomish, WA · Accident · 1 fatal · Closed · Jul 16, 1971 · N9749C · Destroyed
- [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.engine_model_code IN ('41534', '41582'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?engine=41534&state=WA

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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.