# Fatal NTSB investigations: Lycoming VO-435 series

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 CEN18FA258](https://openairdocs.org/ntsb/CEN18FA258.md): Bell 47G · Arlington, IN · Accident · 1 fatal · Field investigation · Final report · Jul 6, 2018 · N96195 · Substantial damage
  > The inflight separation of the upper transmission due to the thread failure of transmission housing attachment bolts, which were installed on the helicopter with thread damage from a prior installation.
- [NTSB WPR15LA193](https://openairdocs.org/ntsb/WPR15LA193.md): Bell 47G 5 · Salinas, CA · Accident · 1 fatal · Limited investigation · Final report · Jun 20, 2015 · N4427F · Substantial damage
  > The non-instrument-rated pilot's visual flight rules flight into instrument meteorological conditions, which resulted in his spatial disorientation and loss of helicopter control. Contributing to the accident was the pilot's impairment by high-dose opioid use.
- [NTSB CEN14LA415](https://openairdocs.org/ntsb/CEN14LA415.md): Bell 47G 2 · Jeanerette, LA · Accident · 1 fatal · Limited investigation · Final report · Aug 10, 2014 · N4690 · Destroyed
  > The pilot’s improper decision to operate an unairworthy helicopter, which resulted in a loss of control and subsequent impact with terrain.
- [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 ERA14FA066](https://openairdocs.org/ntsb/ERA14FA066.md): Texas Helicopter M74L · Sebring, FL · Accident · 1 fatal · Field investigation · Final report · Dec 6, 2013 · N1001N · Destroyed
  > A partial loss of engine power as a result of contamination of the engine’s fuel supply, and the pilot’s impaired performance due to his use of diphenhydramine, which resulted in his inability to complete a forced or precautionary autorotative landing…
- [NTSB CEN13LA086](https://openairdocs.org/ntsb/CEN13LA086.md): Bell 47G-2 · Walkerville, MI · Accident · 1 fatal · Limited investigation · Final report · Dec 1, 2012 · N3755Z · Substantial damage
  > The pilot's failure to maintain altitude while maneuvering, which resulted in a collision with trees. Contributing to the accident was the pilot's decision to fly at a low altitude, which did not provide enough margin to recover from the descent.
- [NTSB NYC06FA100](https://openairdocs.org/ntsb/NYC06FA100.md): Bell 47G-3B-1 · East Hanover Tw, PA · Accident · 2 fatal · Field investigation · Final report · Apr 20, 2006 · N22MP · Destroyed
  > The pilot's improper decision to hover out-of-ground-effect in a tailwind, and his failure to maintain aircraft control. A factor in the accident was the tailwind.
- [NTSB MIA04FA008](https://openairdocs.org/ntsb/MIA04FA008.md): Bell 47G-2A-1 · Balm, FL · Accident · 2 fatal · Field investigation · Final report · Oct 21, 2003 · N73979 · Destroyed
  > The pilot's intentional buzzing and his failure to maintain altitude/clearance which resulted in an in-flight collision with a building.
- [NTSB FTW02LA264](https://openairdocs.org/ntsb/FTW02LA264.md): Bell 47G-2 · Edmondson, AR · Accident · 1 fatal · Limited investigation · Final report · Sep 25, 2002 · N5193B · Destroyed
  > The pilot's failure to maintain clearance from the high voltage power lines.
- [NTSB MIA02FA045](https://openairdocs.org/ntsb/MIA02FA045.md): Piper PA-32-260 · Jacksonville, FL · Accident · 4 fatal · Field investigation · Final report · Dec 13, 2001 · N7701J · Destroyed
  > The pilot becoming spatially disoriented and losing control of the airplane during a missed approach resulting in the airplane descending uncontrolled and colliding with trees and the ground.
- [NTSB ATL99FA132](https://openairdocs.org/ntsb/ATL99FA132.md): Continental Copters Tomcat MK5A · Heflin, AL · Accident · 2 fatal · Field investigation · Final report · Sep 16, 1999 · N9010T · 2 aircraft · Destroyed
  > The pilot of N9010T's failure to maintain visual lookout while maneuvering, resulting in a midair collision with N30899. A factor was the sun glare.
- [NTSB SEA99LA149](https://openairdocs.org/ntsb/SEA99LA149.md): Bell 47G-2 · Benton City, WA · Accident · 1 fatal · Limited investigation · Final report · Aug 26, 1999 · N11VH · Destroyed
  > A loss of power for undetermined reasons and the failure of the pilot to maintain adequate rotor RPM following the power loss. Contributing factors were the pilot's lack of certification and total experience.
- [NTSB LAX96LA111](https://openairdocs.org/ntsb/LAX96LA111.md): Bell 47G-2A1 · Honiara, Solomon Islands · Accident · 1 fatal · Limited investigation · Final report · Jan 29, 1996 · N6569H · Destroyed
  > the pilot and the ship crew's failure to assure the tie down strap was removed prior to liftoff.
- [NTSB LAX94LA386](https://openairdocs.org/ntsb/LAX94LA386.md): Bell 47G-5 · Pacific Ocean (Pacific Ocean) · Accident · 2 fatal · Limited investigation · Final report · Sep 17, 1994 · N2280W · Substantial damage
  > an in-flight collision with the water for undetermined reasons.
- [NTSB FTW94FA158](https://openairdocs.org/ntsb/FTW94FA158.md): Bell 47G-2 · Tulsa, OK · Accident · 1 fatal · Field investigation · Final report · May 16, 1994 · N47GY · Destroyed
  > In flight loss of control due to the pilot's improper use of the cyclic and collective controls when he maneuvered abruptly to avoid colliding with a flock of birds. Factors were the birds and the inflight separation of the left synchronized elevator.
- [NTSB LAX94LA199](https://openairdocs.org/ntsb/LAX94LA199.md): Continental Copters Tomcat MK5A · Brawley, CA · Accident · 1 fatal · Limited investigation · Final report · Apr 22, 1994 · N9061T · Destroyed
  > Failure of the pilot to maintain sufficient altitude, while maneuvering to land after completing aerial application. Factors related to the accident were: darkness and the lack of visual cues for the pilot to detect the obstruction (power line).
- [NTSB CHI94FA330](https://openairdocs.org/ntsb/CHI94FA330.md): Bell 47G-5A · Wisconsin Rpds, WI · Accident · 1 fatal · Field investigation · Final report · Mar 22, 1994 · N2991W · Destroyed
  > Undetermined.
- [NTSB CHI91FA294](https://openairdocs.org/ntsb/CHI91FA294.md): Bell-K Copter 47D1 · Laurie, MO · Accident · 3 fatal · Field investigation · Final report · Sep 15, 1991 · N7768 · Destroyed
  > Poor judgement of the pilot, due to impairment from consumption of alcoholic beverage before flight, his intentional buzzing, and his inadequate visual lookout (failure to see-and-avoid power lines).
- [NTSB LAX91LA013](https://openairdocs.org/ntsb/LAX91LA013.md): Bell 47G5 · Antarctica · Accident · 2 fatal · Limited investigation · Final report · Oct 22, 1990 · N2294W · Destroyed
  > The pilot's failure to maintain on adequate altitude while maneuvering above the water.
- [NTSB ATL89FA193](https://openairdocs.org/ntsb/ATL89FA193.md): Texas Helicopter OH-13/M74 · Norman Park, GA · Accident · 1 fatal · Field investigation · Final report · Aug 2, 1989 · N51850 · Destroyed
  > Improper planning/decision by the pilot, which resulted in his physical impairment from exposure to lannate, and his failure to maintain altitude/clearance above the ground. A factor related to the accident was: failure of the pilot to use a respirator while…
- [NTSB CHI88DEX11](https://openairdocs.org/ntsb/CHI88DEX11.md): Continental Copters MK-5 · Redkey, IN · Accident · 1 fatal · Final report · Aug 10, 1988 · N25561 · Destroyed
  > Physical impairment of the pilot due to drugs which resulted in a misjudged approach and subsequent contact with trees during the approach to an aerial application swath run.
- [NTSB MIA87FA236](https://openairdocs.org/ntsb/MIA87FA236.md): Cessna 152 · Opa Locka, FL · Accident · 1 fatal · Field investigation · Final report · Aug 31, 1987 · N48864 · 2 aircraft · Substantial damage
  > A student plt & instructor (CFI) in Cessna 152, N48864, took off & entered rgt traffic to practice lndgs on rwy 9R. Soonthereafter, a helicopter plt (h/p) in a bell 47G-2, N6728D, took off & entered rgt traffic to practice lndgs in a desig-nated helicopter…
- [NTSB LAX86LA211](https://openairdocs.org/ntsb/LAX86LA211.md): Bell 47G-5A · Agana · Accident · 1 fatal · Limited investigation · Final report · May 6, 1986 · N2996W · Destroyed
  > The helicopter crashed into the ocean when the plt attempted to lift off from a tuna boat. Reportedly, only three of the four tiedown ropes, which had secured the helicopter to the boat, had been released. The plt's medical certificate was dated 1/18/84.
- [NTSB CHI86FA017](https://openairdocs.org/ntsb/CHI86FA017.md): Bell 47G-5 · Plainfield, WI · Accident · 1 fatal · Field investigation · Final report · Oct 27, 1985 · N7840S · Destroyed
  > The acft crashed into trees and nosed into the wooded terrain after a loss of powr. The helicopter had been refueled the day before the acc. Normal fuel load was 20 gals. The plt had sprayed 20 acres & flown 9 miles to another field to spray but aborted due…
- [NTSB CHI85FA301](https://openairdocs.org/ntsb/CHI85FA301.md): Bell 47G2A1 · Brook, IN · Accident · 1 fatal · Field investigation · Final report · Jul 20, 1985 · N1345A · Destroyed
  > The helicopter contacted the terrain in a flat attitude and rolled over during an autorotative landing. A witness stated an autorotation was entered at 800 ft AGL during which the plt made a 360 deg descending turn. An application of pwr was heard at an alt…
- [NTSB CHI85FA198](https://openairdocs.org/ntsb/CHI85FA198.md): Bell 47G-2 · Burlington, MI · Accident · 1 fatal · Field investigation · Final report · May 16, 1985 · N3755J · Substantial damage
  > The helicopter was departing from a trailer which was sloped 5 degs to the left. During takeoff, the left skid lifted off first and the helicopter drifted to the right. The right skid caught on the trailer guides and the helicopter rolled over to the right.
- [NTSB NYC83FA106](https://openairdocs.org/ntsb/NYC83FA106.md): Bell 47G-2 · Waymart, PA · Accident · 2 fatal · Field investigation · Final report · Apr 30, 1983 · N2829B · Destroyed
  > This was an introductory instructional flt. Witnesses observed the helicopter flying straight & level prior to the accident. The helicopter had impacted a 60-FT tree at about the 40-FT level. No preimpact failure/falfunction of either the airframe or engine…
- [NTSB CHI81FEV21](https://openairdocs.org/ntsb/CHI81FEV21.md): Texas Hel OH-13H · Danville, IL · Accident · 1 fatal · Closed · Jun 16, 1981 · N10002 · Destroyed
- [NTSB LAX80FVM37](https://openairdocs.org/ntsb/LAX80FVM37.md): Texas Hel OH-13H · Salinas, CA · Accident · 1 fatal · Closed · Aug 6, 1980 · N10003 · Substantial damage
- [NTSB NYC79FHJ21](https://openairdocs.org/ntsb/NYC79FHJ21.md): Bell 47G-5 · Jamesport, NY · Accident · 1 fatal · Closed · Jul 6, 1979 · N8593F · Destroyed
- [NTSB SEA79AA029](https://openairdocs.org/ntsb/SEA79AA029.md): Hiller UH12D · Chehalis, WA · Accident · 1 fatal · Closed · Apr 3, 1979 · N64867 · Minor damage
- [NTSB LAX79FUJ13](https://openairdocs.org/ntsb/LAX79FUJ13.md): Bell 47G3B · Springerville, AZ · Accident · 1 fatal · Closed · Nov 10, 1978 · N8483E · Destroyed
- [NTSB MKC76AK012](https://openairdocs.org/ntsb/MKC76AK012.md): Bell 47G-5 · Keystone, SD · Accident · 3 fatal · Closed · Aug 5, 1975 · N4753R · Substantial damage
- [NTSB OAK75FVG79](https://openairdocs.org/ntsb/OAK75FVG79.md): Tomcat MK 5A · Gridley, CA · Accident · 1 fatal · Closed · Jun 25, 1975 · N9001T · Destroyed
- [NTSB SEA75AS022](https://openairdocs.org/ntsb/SEA75AS022.md): Bell 47G-2 · Kingston, WA · Accident · 1 fatal · Closed · Nov 4, 1974 · N5160B · Destroyed
- [NTSB LAX74AL084](https://openairdocs.org/ntsb/LAX74AL084.md): Bell 47G-3B · La Crescnta, CA · Accident · 2 fatal · Closed · Jun 23, 1974 · N8496E · Destroyed
- [NTSB FTW74FPJ06](https://openairdocs.org/ntsb/FTW74FPJ06.md): EL Tomcat MK5 · Springer, OK · Accident · 1 fatal · Closed · Aug 16, 1973 · N11VH · Substantial damage
- [NTSB NYC71FHA51](https://openairdocs.org/ntsb/NYC71FHA51.md): Bell 47G2 · Branchville, NJ · Accident · 1 fatal · Closed · Jun 8, 1971 · N8426E · Destroyed
- [NTSB OAK71AP032](https://openairdocs.org/ntsb/OAK71AP032.md): Bell 47G-5 · S.Francisco, CA · Accident · 1 fatal · Closed · Feb 11, 1971 · N2294W · Destroyed
- [NTSB UNK69X0137](https://openairdocs.org/ntsb/UNK69X0137.md): Bell 47G-2 · Ngara Fall, Canada · Accident · 3 fatal · Closed · Aug 5, 1969 · N8403E · Destroyed
- [NTSB NYC69A0105](https://openairdocs.org/ntsb/NYC69A0105.md): Bell 47D1 · Gettysburg, PA · Accident · 1 fatal · Closed · May 25, 1969 · N6598D · Destroyed
- [NTSB LAX70F0025](https://openairdocs.org/ntsb/LAX70F0025.md): Bell 47G-2 · Hollywood, CA · Accident · 2 fatal · Closed · Sep 4, 1968 · N5193B · Destroyed
- [NTSB ANC68A0004](https://openairdocs.org/ntsb/ANC68A0004.md): Bell 47G-2 · Cordova, AK · Accident · 1 fatal · Closed · Jul 27, 1967 · N8406E · Destroyed
- [NTSB UNK67X0126](https://openairdocs.org/ntsb/UNK67X0126.md): Bell 47J · Ontario, Canada · Accident · 3 fatal · Closed · Jun 8, 1967 · N2833B · Destroyed
- [NTSB UNK64X2719](https://openairdocs.org/ntsb/UNK64X2719.md): Bell 47G3 · Manson, WA · Accident · 1 fatal · Closed · Jul 8, 1964 · N8441E · 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."highestInjuryLevel" = 'Fatal'
  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&fatal=1

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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.