# NTSB investigations: Lycoming VO-435 series, MN

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 CEN18LA300](https://openairdocs.org/ntsb/CEN18LA300.md): Continental Copters Tomcat MK5A · Le Sueur, MN · Accident · Minor injuries · Limited investigation · Final report · Jul 27, 2018 · N9005T · Substantial damage
  > The pilot's inadequate preflight and in-flight fuel planning, during which he did not visually check the fuel quantity in the fuel tanks and instead relied on the fuel gauges that were showing erroneous fuel quantity indications, which resulted in fuel…
- [NTSB CEN14CA391](https://openairdocs.org/ntsb/CEN14CA391.md): Continental Copters Tomcat MK5A · Osage, MN · Accident · No injuries · Data collection · Final report · Jul 25, 2014 · N161SH · Substantial damage
  > The total loss of engine power due to water contamination of the fuel, which resulted in the pilot's forced landing and impact with terrain. Contributing to the accident was the pilot's decision to operate the helicopter without resolving the fuel…
- [NTSB CEN14LA418](https://openairdocs.org/ntsb/CEN14LA418.md): Texas Helicopter OH 13H/M74A · Little Falls, MN · Accident · 1 fatal · Limited investigation · Final report · May 28, 2014 · N51853 · Substantial damage
  > The pilot's failure to maintain clearance from a tree at the edge of a field that he was spraying.
- [NTSB CEN13LA537](https://openairdocs.org/ntsb/CEN13LA537.md): Continental Copters Tomcat MK5A · Arlington, MN · Accident · No injuries · Limited investigation · Final report · Sep 6, 2013 · N9005T · Substantial damage
  > The pilot’s failure to maintain control of the helicopter while maneuvering when he removed his hand from the collective control while plugging in his radio connection to his helmet, which resulted in the collective moving to the full-down position.
- [NTSB CEN11CA525](https://openairdocs.org/ntsb/CEN11CA525.md): Bell 47G-2A · Nicolett, MN · Accident · No injuries · Data collection · Final report · Jul 27, 2011 · N7578 · Substantial damage
  > The pilot's failure to maintain control of the helicopter while maneuvering during an aerial application flight.
- [NTSB CHI04CA180](https://openairdocs.org/ntsb/CHI04CA180.md): Texas Helicopter M-74 · Clear Lake, MN · Accident · No injuries · Data collection · Final report · Jul 9, 2004 · N10009 · Substantial damage
  > The pilot failed to maintain a proper glidepath to the landing zone. A factor was the truck pad.
- [NTSB CHI03LA210](https://openairdocs.org/ntsb/CHI03LA210.md): Bell 47G-5 · Cleveland, MN · Accident · Serious injuries · Limited investigation · Final report · Jul 15, 2003 · N7925J · Destroyed
  > The pilot's inadequate visual lookout and low altitude flight when he failed to maintain altitude/clearance from the transmission wire. A factor contributing to the accident was the transmission wire.
- [NTSB CHI02LA163](https://openairdocs.org/ntsb/CHI02LA163.md): Bell 47G-2A-1 · Jordan, MN · Accident · Minor injuries · Limited investigation · Final report · Jun 11, 2002 · N8542D · Substantial damage
  > The loss of engine power due to improper maintenance by unknown maintenance personnel which led to a misalignment of the gearbox casing.
- [NTSB CHI01LA259](https://openairdocs.org/ntsb/CHI01LA259.md): Bell 47G-2 · Blooming Prairi, MN · Accident · No injuries · Limited investigation · Final report · Aug 5, 2001 · N440TG · Substantial damage
  > The reported loss of engine power for undetermined reasons during a the cruise portion of a CFR part 137 observation, and the pilot not following the height/velocity charts data.
- [NTSB CHI97LA306](https://openairdocs.org/ntsb/CHI97LA306.md): Bell 47 · Pipestone, MN · Accident · Serious injuries · Limited investigation · Final report · Sep 30, 1997 · N9005T · Substantial damage
  > the fracture of the pitch control rod assembly.
- [NTSB MKC90LA138](https://openairdocs.org/ntsb/MKC90LA138.md): Hiller 12-E · Watson, MN · Accident · No injuries · Limited investigation · Final report · Jun 26, 1990 · N62397 · Substantial damage
  > Pilot misjudged his flare and collided with the terrain.
- [NTSB CHI86FER11](https://openairdocs.org/ntsb/CHI86FER11.md): Bell 47G-5 · Brooten, MN · Accident · Serious injuries · Final report · Jun 17, 1986 · N8122J · Destroyed
  > According to the pilot, the helicopter collective control failed to respond to a climb input to level off after a descent for an agricultural swath run. Fire and impact damage to the helicopter was extensive, however one broken rod end in the collective…
- [NTSB CHI82DER14](https://openairdocs.org/ntsb/CHI82DER14.md): Bell 47G2 · Kerrick, MN · Accident · No injuries · Closed · Nov 28, 1981 · N13298 · Substantial damage
- [NTSB CHI81FER60](https://openairdocs.org/ntsb/CHI81FER60.md): Bell 47G3B1 · Stewart, MN · Accident · No injuries · Closed · Aug 12, 1981 · N96671 · Substantial damage
- [NTSB CHI81DER47](https://openairdocs.org/ntsb/CHI81DER47.md): Bell 47G-2 · Gully, MN · Accident · No injuries · Closed · Jun 27, 1981 · N6744D · Substantial damage
- [NTSB CHI80FER50](https://openairdocs.org/ntsb/CHI80FER50.md): Bell OH-13H · Olivia, MN · Accident · Minor injuries · Closed · Jun 23, 1980 · N51862 · Destroyed
- [NTSB MKC79DER70](https://openairdocs.org/ntsb/MKC79DER70.md): Bell 47G-2 · St.Peter, MN · Accident · No injuries · Closed · Sep 2, 1979 · N59H · Substantial damage
- [NTSB MKC78FER45](https://openairdocs.org/ntsb/MKC78FER45.md): Bell 47G-2A · Arden Hills, MN · Accident · Minor injuries · Closed · May 17, 1978 · N7578 · Destroyed
- [NTSB MKC75DER73](https://openairdocs.org/ntsb/MKC75DER73.md): Bell 47G2 · Rosemount, MN · Accident · No injuries · Closed · Jun 3, 1975 · N108DA · Substantial damage
- [NTSB MKC75DER12](https://openairdocs.org/ntsb/MKC75DER12.md): Bell 47G-2 · Meridan, MN · Accident · No injuries · Closed · Aug 5, 1974 · N2870B · Substantial damage
- [NTSB MKC73DER66](https://openairdocs.org/ntsb/MKC73DER66.md): Bell 47G-2 · Brainerd, MN · Accident · No injuries · Closed · Jun 1, 1973 · N65520 · Substantial damage
- [NTSB MKC73AK059](https://openairdocs.org/ntsb/MKC73AK059.md): Bell 47G-2 · Owatonna, MN · Accident · No injuries · Closed · Apr 6, 1973 · N38926 · Substantial damage
- [NTSB MKC73FER04](https://openairdocs.org/ntsb/MKC73FER04.md): EL Tomcat MK6B · Miesville, MN · Accident · Minor injuries · Closed · Jul 5, 1972 · N7840S · Destroyed
- [NTSB MKC72DER18](https://openairdocs.org/ntsb/MKC72DER18.md): Bell 47G-5 · Blomkist, MN · Accident · Minor injuries · Closed · Aug 25, 1971 · N7840S · Destroyed
- [NTSB MKC71DER74](https://openairdocs.org/ntsb/MKC71DER74.md): Bell 47G2 · Franklin, MN · Accident · Minor injuries · Closed · Jun 15, 1971 · N13298 · Substantial damage
- [NTSB MKC71DDM14](https://openairdocs.org/ntsb/MKC71DDM14.md): Bell 47G-2 · Morton, MN · Accident · No injuries · Closed · Jul 27, 1970 · N13298 · Substantial damage
- [NTSB MKC70F0169](https://openairdocs.org/ntsb/MKC70F0169.md): Bell 47G-2 · Lakeville, MN · Accident · Minor injuries · Closed · Jul 19, 1969 · N2490B · Substantial damage
- [NTSB MKC66A0065](https://openairdocs.org/ntsb/MKC66A0065.md): Bell 47D1 · Maple Plain, MN · Accident · No injuries · Closed · Jun 15, 1966 · N4252A · Destroyed
- [NTSB MKC65A0072](https://openairdocs.org/ntsb/MKC65A0072.md): Bell 47G2 · Brooklyn Prk, MN · Accident · No injuries · Closed · Jun 10, 1965 · N2813B · Substantial damage
- [NTSB UNK64X2623](https://openairdocs.org/ntsb/UNK64X2623.md): Bell 47G2 · Lake Lillian, MN · Accident · Serious injuries · Closed · Jul 3, 1964 · N262MV · Destroyed

## 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" = 'MN' 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 ('41525'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?engine=41525&state=MN

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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.