# NTSB investigations: Lycoming VO-435 series, TX

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 GAA19CA250](https://openairdocs.org/ntsb/GAA19CA250.md): Bell 47G · Denton, TX · Accident · No injuries · Data collection · Final report · May 6, 2019 · N5990 · Substantial damage
  > The flight instructor's improper decision to instruct the student pilot to establish a hover and reposition the helicopter with a tailwind, which resulted in the student pilot's loss of pitch control.
- [NTSB GAA19CA216](https://openairdocs.org/ntsb/GAA19CA216.md): Bell 47G · Donna, TX · Accident · No injuries · Data collection · Final report · Apr 17, 2019 · N96671 · Substantial damage
  > The pilot's failure to maintain altitude during an agricultural application flight.
- [NTSB CEN16LA213](https://openairdocs.org/ntsb/CEN16LA213.md): Bell 47G 5 · Laureles, TX · Accident · Minor injuries · Limited investigation · Final report · Jun 9, 2016 · N6203N · Substantial damage
  > The pilot's failure to apply additional engine power when he applied collective input, which led to a loss of rotor speed and the exceedance of the helicopter’s performance capability.
- [NTSB CEN09LA324](https://openairdocs.org/ntsb/CEN09LA324.md): Bell 47G · Kyle, TX · Accident · Serious injuries · Limited investigation · Final report · May 30, 2009 · N4823 · Substantial damage
  > The ground crewmember's failure to assure that the fuel nozzle was closed before pressurizing the line. Contributing to the accident was the lack of an available fire extinguisher.
- [NTSB DFW07CA156](https://openairdocs.org/ntsb/DFW07CA156.md): Bell 47G-2A · Mercedes, TX · Accident · Minor injuries · Data collection · Final report · Jul 11, 2007 · N7878 · Substantial damage
  > The pilot's failure to maintain clearance from the power transmission line.
- [NTSB DFW06CA123](https://openairdocs.org/ntsb/DFW06CA123.md): Bell 47G-2 · Rosenberg, TX · Accident · Minor injuries · Data collection · Final report · May 10, 2006 · N993B · Substantial damage
  > The pilots encounter with loss of tail rotor effectiveness during an aerial application flight. A contributing factor was the gusty winds.
- [NTSB FTW04CA207](https://openairdocs.org/ntsb/FTW04CA207.md): Bell 47G-3B-1 · Troy, TX · Accident · No injuries · Data collection · Final report · Aug 5, 2004 · N47713 · Substantial damage
  > The flight instructor's improper flare, resulting in a hard landing. A contributing factor was the high density altitude.
- [NTSB FTW01LA202](https://openairdocs.org/ntsb/FTW01LA202.md): Hiller UH-12D · Lubbock, TX · Accident · Minor injuries · Limited investigation · Final report · Sep 3, 2001 · N2770 · Substantial damage
  > the failure of the tail rotor drive shaft hanger bearing, which resulted in the separation of the tail rotor drive shaft. A contributing factor was the lack of suitable terrain for the forced landing.
- [NTSB FTW99TA194](https://openairdocs.org/ntsb/FTW99TA194.md): Bell 47G-3B-1 · Sour Lake, TX · Accident · No injuries · Final report · Jul 17, 1999 · N4002G · Substantial damage
  > The pilot's failure to adequately preflight the helicopter's fuel system resulting in the total loss of engine power as a result of water contamination. Factors were the incorrect filter installed on the fueling truck and the pilot's improper touchdown…
- [NTSB FTW96LA229](https://openairdocs.org/ntsb/FTW96LA229.md): Bell 47J · Lakeway, TX · Accident · No injuries · Limited investigation · Final report · May 26, 1996 · N8412E · Substantial damage
  > The pilot's failure to maintain a proper descent rate prior to landing.
- [NTSB FTW96LA121](https://openairdocs.org/ntsb/FTW96LA121.md): Hiller UH-12D · Carrizo Springs, TX · Accident · No injuries · Limited investigation · Final report · Feb 16, 1996 · N67065 · Substantial damage
  > a loss of engine power for undetermined reasons, and the pilot's improper touchdown.
- [NTSB FTW96LA008](https://openairdocs.org/ntsb/FTW96LA008.md): Bell 47-G2 · Freer, TX · Accident · Minor injuries · Limited investigation · Final report · Oct 5, 1995 · N4423 · Substantial damage
  > the pilot's failure to maintain clearance from the power lines due to his improper takeoff technique. A factor was the helicopter induced blowing dust which impaired the pilot's visibility.
- [NTSB FTW95LA239](https://openairdocs.org/ntsb/FTW95LA239.md): Bell 47G-5 · Falfurrias, TX · Accident · No injuries · Limited investigation · Final report · May 30, 1995 · N1502L · Substantial damage
  > Inadvertent installation of an unapproved part (tail rotor gear/drive assembly), that became excessively worn since it did not conform to the manufacturer's specification, resulting in failure of the associated tail rotor bearing (also an unapproved part),…
- [NTSB FTW92LA159](https://openairdocs.org/ntsb/FTW92LA159.md): Bell 47G-2 · Danbury, TX · Accident · No injuries · Limited investigation · Final report · Jun 14, 1992 · N6746D · Substantial damage
  > The failure of the landing gear skid due to internal corrosion. A factor was the soft ground.
- [NTSB FTW92LA044](https://openairdocs.org/ntsb/FTW92LA044.md): Hiller-Osborn UH-12D · Rio Medina, TX · Accident · No injuries · Limited investigation · Final report · Dec 2, 1991 · N67065 · Substantial damage
  > The pilot's improper flare during touchdown.
- [NTSB FTW91LA166](https://openairdocs.org/ntsb/FTW91LA166.md): Bell 47G-5A · Pearsall, TX · Accident · Minor injuries · Limited investigation · Final report · Sep 26, 1991 · N59424 · Destroyed
  > The pilot's failure to maintain adequate visual lookout for obstacles during operations from a remote site.
- [NTSB FTW88DRA03](https://openairdocs.org/ntsb/FTW88DRA03.md): Hiller UH-12-D · Bon-Wier, TX · Accident · Serious injuries · Final report · Feb 17, 1988 · N48265 · Destroyed
  > Ground crewmember's failure to follow established procedures for secureing the aircraft to the transport trailer.
- [NTSB FTW88LA008](https://openairdocs.org/ntsb/FTW88LA008.md): Bell 47G-2 · Lapra, TX · Accident · No injuries · Limited investigation · Final report · Oct 20, 1987 · N8403E · Substantial damage
  > Upon entering a bank approx. 80 to 100 ft. off the ground, the aircraft experienced a power loss with vibration. During autorotation the aircraft contacted a tree causing substantial damage. Examination of the wreckage found the transmission clutch assembly…
- [NTSB FTW85LA288](https://openairdocs.org/ntsb/FTW85LA288.md): Bell 47G-5 · Crane, TX · Accident · No injuries · Limited investigation · Final report · Jul 16, 1985 · N8197J · Destroyed
  > The helicopter was being operated from a flat bed trailer. The plt stated he had lifted to a 3 foot hover when the eng stopped. The helicopter suddenly rotated about 45 degs before he could stop it. The plt attempted to make an autorotation touchdown but was…
- [NTSB FTW85LA135](https://openairdocs.org/ntsb/FTW85LA135.md): Hiller UH-12D · Big Spring, TX · Accident · No injuries · Limited investigation · Final report · Mar 2, 1985 · N26EW · Substantial damage
  > CFI was demonstrating a simulated eng failure with tailwind of 10 KTS, 20 KTS grnd speed. The acft yawed left and touchdown was made with 10 kt grnd speed. The right skid broke off and the acft rolled over. The maneuver was initiated at 4 ft skid height.
- [NTSB FTW82IA268](https://openairdocs.org/ntsb/FTW82IA268.md): Bell 47G2A1 · Near Mertzon, TX · Incident · No injuries · Incident investigation · Final report · Jul 3, 1982 · N73983 · Minor damage
  > While the aircraft was being hovered low and slow around a water trough, directional control was lost. The pilot autorotated to the ground and on touchdown the right skid buckled and the tailrotor gearbox separated when it struck an ant hill. The pilot…
- [NTSB FTW80DRG09](https://openairdocs.org/ntsb/FTW80DRG09.md): Bell 47G-5A · Alice, TX · Accident · No injuries · Closed · Nov 29, 1979 · N58132 · Substantial damage
- [NTSB FTW79FRG13](https://openairdocs.org/ntsb/FTW79FRG13.md): Bell 47G-4A · Falfurrias, TX · Accident · Serious injuries · Closed · Jan 20, 1979 · N4002G · Destroyed
- [NTSB FTW79FRG10](https://openairdocs.org/ntsb/FTW79FRG10.md): Bell 47G-2 · Alamo, TX · Accident · No injuries · Closed · Dec 6, 1978 · N972B · Destroyed
- [NTSB FTW78DRG40](https://openairdocs.org/ntsb/FTW78DRG40.md): Bell 47G-2A · Rio Grande C., TX · Accident · No injuries · Closed · May 15, 1978 · N73205 · Substantial damage
- [NTSB FTW78FPA08](https://openairdocs.org/ntsb/FTW78FPA08.md): Bell 47J · Addison, TX · Accident · No injuries · Closed · Dec 13, 1977 · N2895B · Substantial damage
- [NTSB FTW78DQD05](https://openairdocs.org/ntsb/FTW78DQD05.md): Bell 47J · El Paso, TX · Accident · No injuries · Closed · Dec 6, 1977 · N2881B · Substantial damage
- [NTSB FTW78DRG08](https://openairdocs.org/ntsb/FTW78DRG08.md): Bell 47G-2 · Edinburg, TX · Accident · No injuries · Closed · Oct 20, 1977 · N7888B · Substantial damage
- [NTSB FTW76DRG70](https://openairdocs.org/ntsb/FTW76DRG70.md): Bell 47G-2 · Mcallen, TX · Accident · No injuries · Closed · Jul 17, 1976 · N38926 · Substantial damage
- [NTSB FTW75FRG48](https://openairdocs.org/ntsb/FTW75FRG48.md): Bell 47GB31 · Freer, TX · Accident · Serious injuries · Closed · Dec 5, 1974 · N8505F · Substantial damage
- [NTSB FTW74DRG16](https://openairdocs.org/ntsb/FTW74DRG16.md): Bell 47G-2 · Harlingen, TX · Accident · No injuries · Closed · Aug 21, 1973 · N17121 · Substantial damage
- [NTSB FTW73DRG47](https://openairdocs.org/ntsb/FTW73DRG47.md): Bell 47G-5 · Harlingen, TX · Accident · No injuries · Closed · Feb 2, 1973 · N7923J · Substantial damage
- [NTSB FTW73DRG30](https://openairdocs.org/ntsb/FTW73DRG30.md): Bell 47G-5 · Harlingen, TX · Accident · No injuries · Closed · Dec 7, 1972 · N7923J · Substantial damage
- [NTSB FTW71DRG55](https://openairdocs.org/ntsb/FTW71DRG55.md): Bell 47G-2 · Corpus Chrsti, TX · Accident · No injuries · Closed · Dec 4, 1970 · N4823 · Substantial damage
- [NTSB FTW70DPD12](https://openairdocs.org/ntsb/FTW70DPD12.md): Bell 47G4 · Stamford, TX · Accident · No injuries · Closed · May 21, 1970 · N73979 · Substantial damage
- [NTSB FTW70FPD03](https://openairdocs.org/ntsb/FTW70FPD03.md): Bell 47G-5 · Saginaw, TX · Accident · No injuries · Closed · Jan 16, 1970 · N2252W · Substantial damage
- [NTSB FTW70F0204](https://openairdocs.org/ntsb/FTW70F0204.md): Bell 47G-2 · Friendswood, TX · Accident · No injuries · Closed · Sep 4, 1969 · N17120 · Substantial damage
- [NTSB FTW69F0500](https://openairdocs.org/ntsb/FTW69F0500.md): Bell 47G-2 · Amarillo, TX · Accident · Minor injuries · Closed · May 2, 1969 · N6744D · Substantial damage
- [NTSB FTW69F0318](https://openairdocs.org/ntsb/FTW69F0318.md): Bell 47G-2 · Watauga, TX · Accident · No injuries · Closed · Dec 19, 1968 · N17121 · Substantial damage
- [NTSB UNK64X2134](https://openairdocs.org/ntsb/UNK64X2134.md): Bell 47G2 · Fort Worth, TX · Accident · No injuries · Closed · Jun 5, 1964 · N2151 · 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" = 'TX' 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=TX

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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.