# Final NTSB investigations: Franklin 6VS-335 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. Page 1 of 2 · 70 cases ## Latest cases - [NTSB ERA22LA069](https://openairdocs.org/ntsb/ERA22LA069.md): K Copters 47G-2 · Lancaster, PA · Accident · Serious injuries · Class 4 · Limited · Final report · Nov 20, 2021 · N210JB · Substantial damage > The flight instructor’s failure to ensure a positive transfer of aircraft control, which resulted in a loss of control and collision with terrain. - [NTSB ATL07LA045](https://openairdocs.org/ntsb/ATL07LA045.md): Hiller UH-12A · Bethlehem, GA · Accident · 2 fatal · Limited investigation · Final report · Feb 24, 2007 · N8180H · Substantial damage > The pilot's failure to maintain adequate rotor rpm, which resulted in an attempted autorotation and in-flight collision with trees. Contributing to the severity of the accident was the pilot exceeding the helicopters takeoff capability. - [NTSB DFW05CA235](https://openairdocs.org/ntsb/DFW05CA235.md): Bell 47G · Swifton, AR · Accident · Serious injuries · Data collection · Final report · Sep 10, 2005 · N862Z · Substantial damage > The pilot's failure to maintain clearance with the power lines. A contributing factor was sun glare. - [NTSB MIA01LA085](https://openairdocs.org/ntsb/MIA01LA085.md): Hiller UH-12B · Whitesburg, GA · Accident · No injuries · Limited investigation · Final report · Feb 24, 2001 · N5307V · Substantial damage > The improper emergency procedure performed by the pilot due to his electing to perform a run-on landing resulting in excessive airspeed at touchdown and subsequent roll-over following ground contact with grass. A contributing factor was the inadequate… - [NTSB NYC99LA146](https://openairdocs.org/ntsb/NYC99LA146.md): Hiller UH-12C · Delphos, OH · Accident · No injuries · Limited investigation · Final report · Jun 16, 1999 · N57CR · Substantial damage > A blocked fuel line, from an unknown object, that resulted in fuel starvation, and total loss of engine power. A factor in the accident was the pilot's failure to maintain rotor rpm during the autorotation. - [NTSB SEA95LA220](https://openairdocs.org/ntsb/SEA95LA220.md): Hiller UH-12A · Bonners Ferry, ID · Accident · No injuries · Limited investigation · Final report · Sep 17, 1995 · N8180H · Substantial damage > The flight instructor's misjudging his flare during a simulated autorotation. - [NTSB SEA95LA022](https://openairdocs.org/ntsb/SEA95LA022.md): Hiller UH-12C · Twisp, WA · Accident · No injuries · Limited investigation · Final report · Nov 28, 1994 · N54594 · Substantial damage > An unexplained loss of power and the student pilot's delayed application of collective during the landing flare. - [NTSB LAX94FA354](https://openairdocs.org/ntsb/LAX94FA354.md): Stinson 108-3 · Shelter Cove, CA · Accident · 4 fatal · Field investigation · Final report · Sep 5, 1994 · N6446M · Destroyed > Inadequate preflight by the pilot, which resulted in fuel starvation and loss of engine power, improper (or delayed) positioning of the fuel selector to the fullest tank, and failure of the pilot to maintain adequate airspeed, while maneuvering for a forced… - [NTSB FTW94LA147](https://openairdocs.org/ntsb/FTW94LA147.md): Hiller UH-12B · Crystal Beach, TX · Accident · No injuries · Limited investigation · Final report · May 8, 1994 · N6417V · Substantial damage > The pilot's improper autorotation touchdown, which rsulted in the hard landing. A factor was the power loss due to water contaminated fuel. - [NTSB FTW94LA125](https://openairdocs.org/ntsb/FTW94LA125.md): Hiller UH-12 · Alvin, TX · Accident · Minor injuries · Limited investigation · Final report · Apr 16, 1994 · N41319 · Substantial damage > The pilot's failure to maintain rotor speed, delay of the flare, and the improper touchdown. A factor was the loss of engine power for undetermined reasons. - [NTSB ATL92LA131](https://openairdocs.org/ntsb/ATL92LA131.md): Bell 47D1 · Centre, AL · Accident · No injuries · Limited investigation · Final report · Jun 25, 1992 · N68632 · Substantial damage > The pilot's inadequate visual lookout, resulting in a collision with a wire. - [NTSB FTW91LA007](https://openairdocs.org/ntsb/FTW91LA007.md): Bell 47G · Grand Prairie, TX · Accident · No injuries · Limited investigation · Final report · Oct 20, 1990 · N1071Z · Substantial damage > The pilot's inadequate compensation for the existing tailwind conditions and his failure to maintain rotor RPM. - [NTSB MKC89LA016](https://openairdocs.org/ntsb/MKC89LA016.md): Hiller UH-12C · Davenport, IA · Accident · No injuries · Limited investigation · Final report · Oct 26, 1988 · N57FD · Substantial damage > While demonstrating an autorotation touchdown, a tailboom strike was experienced. Damage was incurred to the tailboom, the tail rotor drive shaft, and one main rotor blade. The CFI said everthing felt normal during touchdown and believed the soft terrain… - [NTSB NYC87LA129](https://openairdocs.org/ntsb/NYC87LA129.md): Bell 47G · Bethel, PA · Accident · No injuries · Limited investigation · Final report · Apr 20, 1987 · N59321 · Substantial damage > The student pilot lost directional control of the helicopter and as the instructor pilot attempted to regain control, the main rotor blades struck the ground causing substantial damage to the aircraft. - [NTSB SEA86FA139](https://openairdocs.org/ntsb/SEA86FA139.md): Hiller UH12B · Rathdrum, ID · Accident · Serious injuries · Field investigation · Final report · Jun 8, 1986 · N41319 · Destroyed > The plt reported noticing the fuel gage was nearing empty shortly before the eng quit. The acft crashed during an attempted forced landing on a road. The plt stated he was flying the acft to his residence where it was based. Investigation revealed little fuel… - [NTSB MKC86FA082](https://openairdocs.org/ntsb/MKC86FA082.md): Hiller UH-12B · Fall River, KS · Accident · Serious injuries · Field investigation · Final report · Apr 7, 1986 · N5307V · Destroyed > The helicopter flew through the tops of trees next to a plowed field and impacted almost straight down in the plowed field and nosed over to the inverted position. The pilot stated that he had intended to land in the field and allowed the airspeed and main… - [NTSB MKC85FA114](https://openairdocs.org/ntsb/MKC85FA114.md): Bell OH-13E · Jonesboro, AR · Accident · Serious injuries · Field investigation · Final report · May 29, 1985 · N29WL · Substantial damage > The plt reported that the eng quit due to fuel exhaustion. He attempted to land straight ahead on soft terrain, but the helicopter rolled over. During the accident sequence, the main rotor blades struck the tail boom & scattered parts ahead of & to the rgt of… - [NTSB NYC85FNC03](https://openairdocs.org/ntsb/NYC85FNC03.md): Bell 47H-1 · Guilford, VT · Accident · Serious injuries · Final report · Apr 28, 1985 · N2827B · Destroyed > The helicopter crashed after losing rotor RPM during a max performance takeoff from a confined area at a private landing area. The plt had added 10 gals of fuel and he was carrying a passenger. The plt said he ahd taken off from this area before with no… - [NTSB CHI84LA211](https://openairdocs.org/ntsb/CHI84LA211.md): Bell 47G · Drummond Island, MI · Accident · Serious injuries · Limited investigation · Final report · May 28, 1984 · N10174 · Substantial damage > The plt had previously made 2 local flts, during which, he practiced water landings & takeoffs as well as other maneuvers. On the 3rd flt, he made several water takeoffs & landings. Then while on a landing, the helicopter began to roll quickly to the right.… - [NTSB FTW84LA099](https://openairdocs.org/ntsb/FTW84LA099.md): Hiller UH-12C · Imperial, TX · Accident · No injuries · Limited investigation · Final report · Dec 16, 1983 · N63MC · Substantial damage > The plt reported that when he was in cruise flt at 300 ft AGL, a sudden violent shudder went thru the whole helicopter, then the shudder stopped. He noted no change in the flit characteristics or eng power. The plt elected to make a precautionary landing by… - [NTSB ATL83LA315](https://openairdocs.org/ntsb/ATL83LA315.md): Bell 47D1 · Moultrie, GA · Accident · Minor injuries · Limited investigation · Final report · Aug 6, 1983 · N68632 · Substantial damage > After completing a swath run, the plt pulled up, made a turn, then started a let down for another pass. As he increased power, the eng RPM went from 3000 to 3100. At the same time, the plt heard a whining noise and noted that the rotor RPM was decreasing. The… - [NTSB SEA83LA132](https://openairdocs.org/ntsb/SEA83LA132.md): Hiller UH-12B · Jerome, ID · Accident · No injuries · Limited investigation · Final report · Jun 23, 1983 · N245C · Substantial damage > The acft was destroyed by fire after a forced landing due to pwr loss. The pilot stated that he was en route home after an aerial application mission when the engine lost power. He made an auto-rotation downwind and after exiting the acft noticed an engine… - [NTSB NYC83FHM01](https://openairdocs.org/ntsb/NYC83FHM01.md): Bell 47G · Plainsboro, NJ · Accident · Minor injuries · Final report · May 15, 1983 · N6597D · Destroyed > The acft collided with the ground after a tail rotor drive shaft failed. The plt lost tail rotor control during an aerial application maneuver. The metallurgist report of examination and discovery of fatigue fracture after the accident is a part of the… - [NTSB FTW82FPG11](https://openairdocs.org/ntsb/FTW82FPG11.md): Moore Bell 47D1 · Amagon, AR · Accident · 1 fatal · Final report · May 8, 1982 · N45867 · Destroyed > The purpose of the flight was to test the aerial spray equipment. After starting and warming the engine, the pilot took off, flew about 1/4 mi south, then flew north. A motorist stated that he saw black smoke coming from the helicopter. Two teen-agers heard… - [NTSB DEN82FTM04](https://openairdocs.org/ntsb/DEN82FTM04.md): Hiller UH12C · Logan, UT · Accident · Minor injuries · Closed · Nov 16, 1981 · N6417V · Substantial damage - [NTSB FTW81FPD31](https://openairdocs.org/ntsb/FTW81FPD31.md): Hiller Acft UH-12C · Burleson, TX · Accident · No injuries · Closed · Jul 15, 1981 · N57CR · Substantial damage - [NTSB LAX81FUG06](https://openairdocs.org/ntsb/LAX81FUG06.md): Hiller Acft UH-12B · Rialto, CA · Accident · No injuries · Closed · Dec 25, 1980 · N94731 · Substantial damage - [NTSB LAX80FA104](https://openairdocs.org/ntsb/LAX80FA104.md): Bell 47G · Long Beach, CA · Accident · No injuries · Closed · Jun 11, 1980 · N8270E · Substantial damage - [NTSB LAX79DUM13](https://openairdocs.org/ntsb/LAX79DUM13.md): Bell 47G-2A · Fallbrook, CA · Accident · No injuries · Closed · Apr 24, 1979 · N73872 · Substantial damage - [NTSB MIA79FLD57](https://openairdocs.org/ntsb/MIA79FLD57.md): Bell 47-D1 · Clearwater, FL · Accident · No injuries · Closed · Apr 13, 1979 · N68632 · Destroyed - [NTSB OAK79FVD11](https://openairdocs.org/ntsb/OAK79FVD11.md): Hiller UH-12B · Brentwood, CA · Accident · No injuries · Closed · Feb 25, 1979 · N94731 · Substantial damage - [NTSB NYC78FHM27](https://openairdocs.org/ntsb/NYC78FHM27.md): Hiller 12C · Neptune, NJ · Accident · No injuries · Closed · Aug 29, 1978 · N63MC · Substantial damage - [NTSB OAK77DVW31](https://openairdocs.org/ntsb/OAK77DVW31.md): Bell 47SG · Ash Springs, NV · Accident · No injuries · Closed · Jun 25, 1977 · N979B · Substantial damage - [NTSB LAX77DVA16](https://openairdocs.org/ntsb/LAX77DVA16.md): Hiller Acft UH-12C · Terra Bella, CA · Accident · No injuries · Closed · Jan 15, 1977 · N6417V · Substantial damage - [NTSB LAX77FUM12](https://openairdocs.org/ntsb/LAX77FUM12.md): EL Tomcat 47G · San Diego, CA · Accident · No injuries · Closed · Jan 13, 1977 · N73872 · Substantial damage - [NTSB NYC76FGT27](https://openairdocs.org/ntsb/NYC76FGT27.md): Bell 47D1 · Zion Grove, PA · Accident · No injuries · Closed · Aug 18, 1976 · N919B · Substantial damage - [NTSB MIA76DKJ86](https://openairdocs.org/ntsb/MIA76DKJ86.md): Bell 47D1 · Centre, AL · Accident · No injuries · Closed · Jul 24, 1976 · N29WL · Destroyed - [NTSB MKC76FCD07](https://openairdocs.org/ntsb/MKC76FCD07.md): Bell H-13E · Collins, IA · Accident · Minor injuries · Closed · Aug 30, 1975 · N29WL · Substantial damage - [NTSB CHI74AC096](https://openairdocs.org/ntsb/CHI74AC096.md): Hiller Acft UH-12B · Custar, OH · Accident · 1 fatal · Closed · Jun 2, 1974 · N6744C · Destroyed - [NTSB CHI74FEM62](https://openairdocs.org/ntsb/CHI74FEM62.md): EL Tomcat I · Belding, MI · Accident · No injuries · Closed · May 29, 1974 · N73872 · Substantial damage - [NTSB IAD74FIA14](https://openairdocs.org/ntsb/IAD74FIA14.md): Bell 47D1 · Stephens City, VA · Accident · No injuries · Closed · May 8, 1974 · N919B · Substantial damage - [NTSB MIA74FLA08](https://openairdocs.org/ntsb/MIA74FLA08.md): Bell 47D-1 · Destin, FL · Accident · No injuries · Closed · Aug 5, 1973 · N6579D · Substantial damage - [NTSB CHI74FEA04](https://openairdocs.org/ntsb/CHI74FEA04.md): Bell 47G-3 · Dana, IN · Accident · Serious injuries · Closed · Jul 13, 1973 · N8416E · Substantial damage - [NTSB CHI73DEA37](https://openairdocs.org/ntsb/CHI73DEA37.md): Bell 47D-1 · Bloomfield, IN · Accident · No injuries · Closed · Jun 5, 1973 · N2794A · Destroyed - [NTSB FTW73DPJ20](https://openairdocs.org/ntsb/FTW73DPJ20.md): Hiller UH-12B · Guymon, OK · Accident · No injuries · Closed · May 28, 1973 · N6744C · Substantial damage - [NTSB MIA73FKT53](https://openairdocs.org/ntsb/MIA73FKT53.md): Bell 47G · Miami Beach, FL · Accident · Serious injuries · Closed · Jan 22, 1973 · N864Z · Substantial damage - [NTSB SEA73DYA05](https://openairdocs.org/ntsb/SEA73DYA05.md): Bell 47G · Murtaugh, ID · Accident · Serious injuries · Closed · Aug 6, 1972 · N1071Z · Substantial damage - [NTSB MIA72FKQ12](https://openairdocs.org/ntsb/MIA72FKQ12.md): Bell 47D-1 · Mt Olive, MS · Accident · No injuries · Closed · Aug 27, 1971 · N2794A · Substantial damage - [NTSB MKC72FCG11](https://openairdocs.org/ntsb/MKC72FCG11.md): Hiller UH-12A · Springfield, MO · Accident · Minor injuries · Closed · Aug 11, 1971 · N4287C · Substantial damage - [NTSB CHI71DEI52](https://openairdocs.org/ntsb/CHI71DEI52.md): Bell 47D1 · Bloomdale, OH · Accident · No injuries · Closed · May 27, 1971 · N68632 · Substantial damage Next page: https://openairdocs.org/ntsb.md?engine=27040&status=final&page=2 ## 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."completionStatus" = 'Completed' AND c."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('27040')) ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC ``` This list as a web page: https://openairdocs.org/ntsb?engine=27040&status=final --- 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.