# NTSB investigations: Lycoming VO-540 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 2 of 8 · 376 cases ## Cases, newest first - [NTSB LAX00LA107](https://openairdocs.org/ntsb/LAX00LA107.md): Hiller H-12E · Byron, CA · Accident · Minor injuries · Limited investigation · Final report · Feb 21, 2000 · N61PC · Substantial damage > The pilot's inadequate visual lookout while maneuvering in proximity to wires. A contributing factor was the sun glare, which reduced the wire's conspicuity. - [NTSB LAX00LA077](https://openairdocs.org/ntsb/LAX00LA077.md): Hiller UH-12E · Five Points, CA · Accident · No injuries · Limited investigation · Final report · Jan 26, 2000 · N68024 · Substantial damage > The pilot's inadequate clearance while maneuvering beneath a telephone line. - [NTSB SEA00TA013](https://openairdocs.org/ntsb/SEA00TA013.md): Hiller UH-12E · Stites, ID · Accident · Serious injuries · Final report · Nov 2, 1999 · N5388V · Substantial damage > Inadequate inspection of the control rotor cuff by a company mechanic and subsequent fatigue fracture of the cuff, resulting in an inflight separation of the control rotor blade. Factors contributing to the accident were: inadequate quality control during… - [NTSB LAX00LA027](https://openairdocs.org/ntsb/LAX00LA027.md): Hiller UH-12E · Castroville, CA · Accident · Serious injuries · Limited investigation · Final report · Oct 28, 1999 · N5374V · Substantial damage > The pilot's inadequate visual lookout and diverted attention. - [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 MIA98FA229](https://openairdocs.org/ntsb/MIA98FA229.md): Bell 47G-4A · Carrollton, AL · Accident · No injuries · Field investigation · Final report · Aug 23, 1998 · N7162M · Substantial damage > The pilots failure to follow written instructions in the flight manual for an engine failure, and the improper use of flight controls (cyclic/collective) during an autorotation resulting in a hard landing, and collision of the main rotor blades with the… - [NTSB CHI98LA312](https://openairdocs.org/ntsb/CHI98LA312.md): Hiller UH-12E · Shelton, NE · Accident · Serious injuries · Limited investigation · Final report · Aug 14, 1998 · N88782 · Substantial damage > The pilot mismanaged the fuel which led to fuel starvation and subsequent loss of engine power. - [NTSB LAX98LA197](https://openairdocs.org/ntsb/LAX98LA197.md): Bell 47G-4A · Shafter, CA · Accident · No injuries · Limited investigation · Final report · Jun 14, 1998 · N110DT · Substantial damage > The aircraft's encounter with settling with power, which resulted from the pilot's decision to perform a steep downwind approach. - [NTSB LAX98LA089](https://openairdocs.org/ntsb/LAX98LA089.md): Hiller UH-12E · Chico, CA · Accident · No injuries · Limited investigation · Final report · Feb 13, 1998 · N4027Z · Substantial damage > Fuel exhaustion due to the pilot's failure to ensure that an adequate fuel supply was onboard. A contributing factor was related to the fuel quantity gage's erroneous indication of fuel. - [NTSB FTW98LA030](https://openairdocs.org/ntsb/FTW98LA030.md): Bell 47G-4A · Welsh, LA · Accident · No injuries · Limited investigation · Final report · Oct 16, 1997 · N7104J · Substantial damage > the pilot's failure to maintain control of the helicopter, while maneuvering to avoid an obstruction. The abrupt maneuver was a related factor. - [NTSB CHI98LA012](https://openairdocs.org/ntsb/CHI98LA012.md): Hiller UH-12E · Liberty, NE · Accident · No injuries · Limited investigation · Final report · Oct 9, 1997 · N4027L · Substantial damage > A loss of engine power for undetermined reasons. - [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 SEA97LA174](https://openairdocs.org/ntsb/SEA97LA174.md): Bell 47G-3B1 · Idaho Falls, ID · Accident · No injuries · Limited investigation · Final report · Jul 22, 1997 · N3069G · Substantial damage > The pilot-in-command's failure to verify the proper chemical and fuel load aboard prior to takeoff. Factors contributing to the accident were: excessive fuel and chemical loading by ground personnel, tailwind conditions, and high density altitude. - [NTSB NYC97LA101](https://openairdocs.org/ntsb/NYC97LA101.md): Hiller UH-12E · Granby, NY · Accident · Serious injuries · Limited investigation · Final report · May 29, 1997 · N4029S · Substantial damage > failure of the pilot/owner to replace the torsional clutch as specified by the manufacturer, and subsequent failure of the helicopter's clutch, which resulted in a forced landing (autorotation). A related factor was: the encounter with trees in the emergency… - [NTSB LAX96LA315](https://openairdocs.org/ntsb/LAX96LA315.md): Bell 47-G4A · Guam · Accident · 1 fatal · Limited investigation · Final report · Aug 26, 1996 · N474GA · Destroyed > loss of tail rotor control due to improper maintenance. - [NTSB FTW96LA315](https://openairdocs.org/ntsb/FTW96LA315.md): Hiller UH-12E · Mount Holly, AR · Accident · Serious injuries · Limited investigation · Final report · Jul 24, 1996 · N9743C · Substantial damage > Fuel exhaustion due to the pilot's failure to refuel the helicopter. A factor was the lack of suitable terrain for the forced landing. - [NTSB LAX96LA279](https://openairdocs.org/ntsb/LAX96LA279.md): Hiller UH-12E · Healdsburg, CA · Accident · No injuries · Limited investigation · Final report · Jul 20, 1996 · N124HA · Substantial damage > The failure of the pilot to confirm a loss of power before entering autorotation after reading an erroneous instrument indication on the helicopter's dual tachometer. Factors in the accident were the erratic instrument, and maintenance personnel who failed to… - [NTSB ATL96LA104](https://openairdocs.org/ntsb/ATL96LA104.md): Hiller UH-12E · Cottondale, FL · Accident · No injuries · Limited investigation · Final report · Jul 11, 1996 · N102HT · Substantial damage > failure of the main rotor drive torsional coupling and inner gimbal ring, which resulted in jamming of the flight controls during an attempted autorotation. - [NTSB FTW96LA285](https://openairdocs.org/ntsb/FTW96LA285.md): Hiller UH12 · Franklin, LA · Accident · No injuries · Limited investigation · Final report · Jul 1, 1996 · N14637 · Substantial damage > loss of engine power for undetermined reasons, and the pilot's failure to maintain rotor RPM. A factor was the unsuitable terrain available for the precautionary 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 ATL96LA076](https://openairdocs.org/ntsb/ATL96LA076.md): Hiller UH12-E · Huger, SC · Accident · Serious injuries · Limited investigation · Final report · Apr 3, 1996 · N14MQ · Substantial damage > The blocked fuel vent line that resulted in engine stoppage. A factor was tall trees that intervened the helicopter's flight path. - [NTSB FTW96LA005](https://openairdocs.org/ntsb/FTW96LA005.md): Bell 47G-4A · Edinburg, TX · Accident · Minor injuries · Limited investigation · Final report · Oct 3, 1995 · N6SR · Substantial damage > the pilot's improper takeoff planning which resulted in the loss of conrol. A factor was the gusty crosswind condition. - [NTSB CHI95LA270](https://openairdocs.org/ntsb/CHI95LA270.md): Bell 47 · Arlington Hts, IL · Accident · Minor injuries · Limited investigation · Final report · Aug 12, 1995 · N4032G · Substantial damage > plot misjudged the flare. The factors included the pilot getting too close to the lead helicopter, allowing his airspeed to get too slow, and encountering settling with power. - [NTSB FTW95LA230](https://openairdocs.org/ntsb/FTW95LA230.md): Hiller UH-12E · Checotah, OK · Accident · Minor injuries · Limited investigation · Final report · Jun 4, 1995 · N4254X · Substantial damage > The pilot allowing the helicopter to touchdown improperly. A factor was the erratic running engine. - [NTSB LAX95LA132](https://openairdocs.org/ntsb/LAX95LA132.md): Hiller UH-12E · Five Points, CA · Accident · No injuries · Limited investigation · Final report · Mar 12, 1995 · N172ET · Substantial damage > fuel exhaustion due to the pilot's inattention to the fuel supply. - [NTSB LAX95LA109](https://openairdocs.org/ntsb/LAX95LA109.md): Hiller UH-12E · Arvin, CA · Accident · No injuries · Limited investigation · Final report · Feb 15, 1995 · N5335V · Substantial damage > The seizure of the transmission due to lack of lubrication from a plugged oil supply line. - [NTSB LAX95LA096](https://openairdocs.org/ntsb/LAX95LA096.md): Hiller UH-12E · Chowchilla, CA · Accident · No injuries · Limited investigation · Final report · Feb 3, 1995 · N9293Z · Destroyed > the in-flight failure and separation of the main rotor hub due to a fatigue crack. - [NTSB FTW95LA105](https://openairdocs.org/ntsb/FTW95LA105.md): Bell 47G-4A · El Indio, TX · Accident · Minor injuries · Limited investigation · Final report · Feb 1, 1995 · N6SR · Destroyed > The loss of tail rotor effectiveness. A factor was the gusty right quartering tailwind. - [NTSB MIA94LA216](https://openairdocs.org/ntsb/MIA94LA216.md): Bell 47G-2A · Moore Haven, FL · Accident · No injuries · Limited investigation · Final report · Sep 23, 1994 · N30JJ · Destroyed > The pilot-in-command's failure to maintain a visual lookout while maneuvering on a swath run, resulting in an in-flight collision with wires, and subsequent in-flight collision with terrain. - [NTSB CHI94LA191](https://openairdocs.org/ntsb/CHI94LA191.md): Hiller HU-12E · Watertown, SD · Accident · 1 fatal · Limited investigation · Final report · Jun 23, 1994 · N330CW · Destroyed > the pilot's failure to maintain a visual lookout. A factor associated with the accident was the powerlines. - [NTSB FTW94LA210](https://openairdocs.org/ntsb/FTW94LA210.md): Hiller UH-12L4 · West Helena, AR · Accident · No injuries · Limited investigation · Final report · Jun 22, 1994 · N90453 · Destroyed > A total loss of power due to a leak in the main fuel line which occurred as a result of an electrical short which burned a hole in the fuel line. Factors were a failure by the pilot to perform recommended maintenance and the lack of suitable terrain for a… - [NTSB SEA94T#A01](https://openairdocs.org/ntsb/SEA94T%23A01.md): Hiller UH-12E · Eugene, OR · Accident · No injuries · Class 3 · Final report · May 6, 1994 · N94492 · Substantial damage - [NTSB MIA94LA029](https://openairdocs.org/ntsb/MIA94LA029.md): Hiller UH-12E · Moore Haven, FL · Accident · Minor injuries · Limited investigation · Final report · Nov 26, 1993 · N130HA · Substantial damage > Failure of the pilot-in-command to maintain aircraft control following loss of engine power for undetermined reasons. - [NTSB LAX94LA043](https://openairdocs.org/ntsb/LAX94LA043.md): Hiller UH-12E · Salinas, CA · Accident · No injuries · Limited investigation · Final report · Nov 13, 1993 · N149HA · Destroyed > The pilot's improper handling of the helicopter which resulted in overloading of the rotor system in a maneuvering turn during aerial application of chemical, and subsequent failure of the main rotor paddle assembly. - [NTSB CHI94LA022](https://openairdocs.org/ntsb/CHI94LA022.md): Hiller UH12E · Sioux Rapids, IA · Accident · No injuries · Limited investigation · Final report · Oct 22, 1993 · N4026S · Destroyed > the Pilot in Command failed to maintain clearance with the terrain while proceeding up an upslope. - [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 ATL93LA065](https://openairdocs.org/ntsb/ATL93LA065.md): Hiller UH12E · Greeleyville, SC · Accident · No injuries · Limited investigation · Final report · Mar 25, 1993 · N4029Z · Substantial damage > The pilot's misjudgment of the helicopter's altitude during the landing flare. - [NTSB LAX93LA166](https://openairdocs.org/ntsb/LAX93LA166.md): Bell 47G2A · Pacific Ocean (Pacific Ocean) · Accident · 1 fatal · Limited investigation · Final report · Mar 24, 1993 · N8493E · Minor damage > The passenger's failure to adhere to the pilot's instructions. Factors which contributed to the accident were: the language/communications difficulty between the pilot & the passenger, and the bird strike. - [NTSB LAX93LA120](https://openairdocs.org/ntsb/LAX93LA120.md): Bell 47G · Bakersfield, CA · Accident · No injuries · Limited investigation · Final report · Feb 13, 1993 · N1185W · Substantial damage > The clutch slippage and failure of the pilot to jettison the load. - [NTSB LAX92LA396](https://openairdocs.org/ntsb/LAX92LA396.md): Bell 47-G4A · Volcano, HI · Accident · Minor injuries · Limited investigation · Final report · Sep 21, 1992 · N73279 · Substantial damage > The pilot's improper use of the collective control after inadvertently entering a power settling condition. - [NTSB CHI92DCD09](https://openairdocs.org/ntsb/CHI92DCD09.md): Hiller Hiller UH-12E · Dows, IA · Accident · No injuries · Final report · Aug 21, 1992 · N527HA · Substantial damage > Contaminated fuel resulting in a loss of engine power. - [NTSB LAX92LA349](https://openairdocs.org/ntsb/LAX92LA349.md): Hiller UH12-E, Saloy Conver · Arvin, CA · Accident · Minor injuries · Limited investigation · Final report · Aug 15, 1992 · N9753C · Substantial damage > The failure of the tension torsion bar pin due to fatigue. Contributing to this accident was that it was not possible for the pilot to flare the helicopter on landing. - [NTSB NYC92FA117](https://openairdocs.org/ntsb/NYC92FA117.md): Bell 47-G4A · Shelburne Falls, MA · Accident · 3 fatal · Field investigation · Final report · Jun 16, 1992 · N1041B · Destroyed > The pilot's failure to maintain adequate obstacle clearance. Contributing was inadequate altitude. - [NTSB LAX92LA152](https://openairdocs.org/ntsb/LAX92LA152.md): Hiller UH-12E · Watsonville, CA · Accident · No injuries · Limited investigation · Final report · Mar 27, 1992 · N149HA · Substantial damage > A failure of the pilot to conduct an adequate pre-flight inspection of the aircraft to ensure that the fuel supply was free of contaminates. Contributing to this accident was fuel contamination. - [NTSB LAX92LA146](https://openairdocs.org/ntsb/LAX92LA146.md): Hiller UH-12E · Huron, CA · Accident · No injuries · Limited investigation · Final report · Mar 21, 1992 · N93478 · Destroyed > A separation of the control rotor cuff due to fatigue. - [NTSB FTW92LA007](https://openairdocs.org/ntsb/FTW92LA007.md): Hiller UH-12E · Palacios, TX · Accident · No injuries · Limited investigation · Final report · Oct 11, 1991 · N4029D · Substantial damage > The pilot's inadequate preflight. - [NTSB LAX91LA388](https://openairdocs.org/ntsb/LAX91LA388.md): Texas Helicopter M74 · Farmington, CA · Accident · 1 fatal · Limited investigation · Final report · Sep 11, 1991 · N43921 · Destroyed > Loss of engine power for an undetermined reason. Factors related to the accident were: the excessive gross weight of the helicopter, and the pilot's improper use of flight controls due to impairment from use of a drug (marijuanna). - [NTSB LAX91LA363](https://openairdocs.org/ntsb/LAX91LA363.md): Bell 47G · Kettleman City, CA · Accident · Minor injuries · Limited investigation · Final report · Aug 20, 1991 · N4062G · Substantial damage > A non-mechanical loss of engine power due to fuel exhaustion by the pilot's improper calculation of the fuel supply and subsequent hard landing. - [NTSB FTW91DRD06](https://openairdocs.org/ntsb/FTW91DRD06.md): Bell 47-G2 · White Castle, LA · Accident · No injuries · Final report · Jun 26, 1991 · N8460E · Destroyed > The pilot's improper aircraft handling, which resulted in settling with power. Next page: https://openairdocs.org/ntsb.md?engine=41534&page=3 ## 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."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&page=2 --- 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.