# 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 3 of 8 · 376 cases ## Cases, newest first - [NTSB LAX91LA249](https://openairdocs.org/ntsb/LAX91LA249.md): Hiller UH-12E · Huron, CA · Accident · No injuries · Limited investigation · Final report · Jun 7, 1991 · N507HA · Substantial damage > That unknown pilot(s) impoperly used the throttle control which caused an overspeed condition. Contributing to this accident was the connecting rod bolt fatigue failure. - [NTSB LAX91LA191](https://openairdocs.org/ntsb/LAX91LA191.md): Hiller UH-12E · Delano, CA · Accident · No injuries · Limited investigation · Final report · May 4, 1991 · N4414 · Substantial damage > That the pilot improperly performed the autorotation by misjudging the flare altitude. Contributing to this accident was the total failure of the freewheeling sprag clutch due to excessive wear and the soft dirt terrain. - [NTSB FTW91LA064](https://openairdocs.org/ntsb/FTW91LA064.md): Bell 47G4 · Corpus Christi, TX · Accident · Minor injuries · Limited investigation · Final report · Apr 27, 1991 · N1195W · Destroyed > The initial restricted movement and eventual locking of the cyclic control as a result of the failure of the lateral servo. A factor was the installation of the failed component by an unqualified person. - [NTSB ANC91LA041](https://openairdocs.org/ntsb/ANC91LA041.md): Bell 47 · Thompson Pass, AK · Accident · No injuries · Limited investigation · Final report · Mar 30, 1991 · N73279 · Substantial damage > The pilot's failure to maintain aircraft control and improper flare during landing. - [NTSB BFO91LA018](https://openairdocs.org/ntsb/BFO91LA018.md): Bell 47J2A · Matoaca, VA · Accident · No injuries · Limited investigation · Final report · Nov 23, 1990 · N8514P · Substantial damage > The failure of four propeller retention and the pilot's misjudgement of the forced landing approach. - [NTSB LAX90DVD03](https://openairdocs.org/ntsb/LAX90DVD03.md): Texas Helicopter M47A Wasp · Stockton, CA · Accident · No injuries · Final report · Aug 27, 1990 · N43921 · Substantial damage > The pilot misjudged the altitude during the flare/touchdown phase of the autorotation. Factors relating to this accident are failure of the right magneto. - [NTSB CHI90DTG02](https://openairdocs.org/ntsb/CHI90DTG02.md): Hiller UH-12-E · Garrison, ND · Accident · No injuries · Final report · Aug 4, 1990 · N133HA · Substantial damage > The failure of the helicopter tail rotor control cable. A factor related to the accident was the chafing of the tail rotor control cable. - [NTSB ATL90LA138](https://openairdocs.org/ntsb/ATL90LA138.md): Bell BH-47G · Seagrove, NC · Accident · Minor injuries · Limited investigation · Final report · Jun 28, 1990 · N3081G · Substantial damage > Failure of a number four connecting rod bolt for an undetermined reason. - [NTSB FTW90DPJ05](https://openairdocs.org/ntsb/FTW90DPJ05.md): Bell 47G-4A · Bixby, OK · Accident · Minor injuries · Final report · Apr 14, 1990 · N2238W · Destroyed > Loss of control due to undetermined mechanical failure. - [NTSB ATL90FA089](https://openairdocs.org/ntsb/ATL90FA089.md): Hiller UH-12D · Soddy-Daisy, TN · Accident · 1 fatal · Field investigation · Final report · Mar 31, 1990 · N94496 · Substantial damage > Fatigue induced failure of the collective pitch push rod (adjustable) during flight, and the failure of the pilot to provide routine maintenance. The pilot's lack of expereince and his failure to obtain required training and certification were factors in the… - [NTSB LAX90DVA01](https://openairdocs.org/ntsb/LAX90DVA01.md): Hiller 12E · Huron, CA · Accident · Serious injuries · Final report · Oct 16, 1989 · N4026G · Substantial damage > The pilot failed to properly preflight the airplane before departing on the accident flight and misjudged the flare during the ensuing autorotation. Factors relating to this accident were oil starvation and total failure of the connecting rod. - [NTSB LAX90DUJ03](https://openairdocs.org/ntsb/LAX90DUJ03.md): Hiller UH-12E · Yuma, AZ · Accident · Serious injuries · Final report · Oct 11, 1989 · N689SB · Substantial damage > The pilot misjudged the flare altitude. Contributing to this accident was the failure of the engine torsional coupling which ultimately caused the total loss of power. - [NTSB LAX89DUJ09](https://openairdocs.org/ntsb/LAX89DUJ09.md): Hiller UH-12E · Tolleson, AZ · Accident · Minor injuries · Final report · Aug 16, 1989 · N7086 · Substantial damage > An engine failure due to water contamination in the fuel supply which preceded an autorotation and collision with the ground during night time conditions. - [NTSB CHI89DEP07](https://openairdocs.org/ntsb/CHI89DEP07.md): Hiller UH-12E · Blackriverfalls, WI · Accident · Minor injuries · Final report · Jul 20, 1989 · N48313 · Destroyed > Pilot-in-command's failure to jettison the external load followed by his misjudgement of distance to avoid collision with the external load. - [NTSB LAX89DVM02](https://openairdocs.org/ntsb/LAX89DVM02.md): Hiller UH-12E · Salinas, CA · Accident · Minor injuries · Final report · Apr 26, 1989 · N169HA · Substantial damage > The separation of the torsion coupling in the main rotor drive system. - [NTSB LAX88DVA16](https://openairdocs.org/ntsb/LAX88DVA16.md): Hiller UH-12E · Helm, CA · Accident · Minor injuries · Final report · Sep 10, 1988 · N4029Y · Substantial damage > During an aerial application flight, the pilot lost control of the helicopter just after liftoff and collided with the terrain. Inspection of the wreckage revealed that the chemical trucks filler hose was still attached to the helicopter when it lifted off. - [NTSB LAX88DUG06](https://openairdocs.org/ntsb/LAX88DUG06.md): Hiller UH-12E · Thermal, CA · Accident · Minor injuries · Final report · Aug 17, 1988 · N65120 · Substantial damage > Shortly after refueling the helicopter & reloading the hopper, the plt took off & was starting to spray a field when the eng suddenly lost power. The plt said the helicopter was dscndg from about 30 ft when the power loss occurred; thus, he barely had time to… - [NTSB MIA88LA225](https://openairdocs.org/ntsb/MIA88LA225.md): Hiller UH-12E · Clewiston, FL · Accident · No injuries · Limited investigation · Final report · Jul 18, 1988 · N108HA · Substantial damage > The plt stated the fuel gages indicated 20 gals when he took off on spraying flt. He had just completed the spray run & started to pull up from about 10 ft & 25 mph. At that time the eng quit '& sounded just like it would if it ran out of gas'. There was not… - [NTSB NYC88LA170](https://openairdocs.org/ntsb/NYC88LA170.md): Bell 47J2 · Newburyport, MA · Accident · Serious injuries · Limited investigation · Final report · Jun 25, 1988 · N51711 · Destroyed > The helicopter departed runway 10 at plum island airport, turned left over the plum island river and shortly thereafter the engine quit. The pilot stated that no warning was noted and a check of the instruments indicated no problems. He further stated that… - [NTSB MIA88LA183](https://openairdocs.org/ntsb/MIA88LA183.md): Hiller UH-12E · Gretna, FL · Accident · No injuries · Limited investigation · Final report · Jun 1, 1988 · N4029R · Substantial damage > While on an aerial application flt, the plt stated he maneuvered the helicopter to release the remaining chemical. He then heard a loud 'screeching' noise followed by silence as the eng quit. The helicopter landed hard breaking the skids. It came to rest on… - [NTSB FTW88DRA05](https://openairdocs.org/ntsb/FTW88DRA05.md): Hiller UH-12E · La Salle, TX · Accident · No injuries · Final report · Apr 4, 1988 · N4029D · Substantial damage > Acft was substantially damaged during an emergency autorotation following an engine failure while the acft was completing an aerial application maneuver. Acft touched down tail low and the main rotor blades flexed down and cut off the tail boom. Investigation… - [NTSB MIA88LA018](https://openairdocs.org/ntsb/MIA88LA018.md): Bell 47J-2 · Key Colony Bch., FL · Accident · No injuries · Limited investigation · Final report · Oct 24, 1987 · N73201 · Substantial damage > The plt stated that he did not check the fuel system for contaminates after refueling but an eighteen minute flt after refueling was uneventful. He then landed the helicopter, remained on the ground aprx 20 minutes, performed a walk around insp, again without… - [NTSB MIA88LA014](https://openairdocs.org/ntsb/MIA88LA014.md): Hiller UH-12E · Union Church, MS · Accident · Minor injuries · Limited investigation · Final report · Oct 6, 1987 · N4029R · Substantial damage > At an altitude of aprx 75 feet during an agricultural turn, the plt reported that the engine lost power. While executing a forced landing, the rotor blades contacted trees, after which, during the descent, the right skid collided with a stump & the helicopter… - [NTSB DEN87DTG02](https://openairdocs.org/ntsb/DEN87DTG02.md): Bell 47G-4A · Minot, ND · Accident · No injuries · Final report · Sep 8, 1987 · N2238W · Substantial damage > The plt rprtd that when he took off fm a nrby nurse truck, the wind was fm the NE at 5 to 7 mph. He made an observation pass across the area to be treated, then bgn a dscndg rgt turn to make a swath run in the opposite drctn. He stated he was unaware of a… - [NTSB LAX87DUJ11](https://openairdocs.org/ntsb/LAX87DUJ11.md): Hiller UH-12E · Scottsdale, AZ · Accident · Minor injuries · Final report · Sep 1, 1987 · N236HA · Destroyed > During an aerial application flight, the plt made a turn-around & was starting to make another swath run when he heard a loud 'bang' & then the helicopter collided with terrain. An inspn of the main rotor head & pin revealed the hub had failed from hi cycle… - [NTSB MIA87LA224](https://openairdocs.org/ntsb/MIA87LA224.md): Bell 47J-2A · Orlando, FL · Accident · No injuries · Limited investigation · Final report · Aug 7, 1987 · N8523F · Substantial damage > During the apch to land the tail rotor drive assy failed resulting in a momentary loss of control. The plt then autorotated & landed on the company helipad, during which the helicopter sustained substantial damage. Examination of the tail rotor drive assy… - [NTSB LAX87DVD04](https://openairdocs.org/ntsb/LAX87DVD04.md): Hiller UH-23-D · Brentwood, CA · Accident · No injuries · Final report · Aug 5, 1987 · N61PC · Substantial damage > During an aerial application flight, the tail boom weight separated and contacted the tail rotor. The pilot lost control of the aircraft and collided with a tree and subsequently the terrain. Post acc invest revealed that the 'pip pins' which secure the tail… - [NTSB DEN87LA204](https://openairdocs.org/ntsb/DEN87LA204.md): Bell 47J-2 · Canon City, CO · Accident · No injuries · Limited investigation · Final report · Jul 30, 1987 · N73265 · Substantial damage > The ATP plt was flying sightseeing rides. There were two adults and two children in the four passenger helicopter. Density altitude was 10000 feet. The acft lost pwr and the plt aborted takeoff and landed. After an eng runup the plt took off again and the… - [NTSB LAX87DVD01](https://openairdocs.org/ntsb/LAX87DVD01.md): Bell 47G4A · Stockton, CA · Accident · Serious injuries · Final report · Feb 2, 1987 · N28938 · Substantial damage > Just after takeoff, the engine experienced a power loss while transporting agricultural equipment. A fractographic examination of the failed fuel disconnect fitting by anamet laboratories, concluded that approximately 70% of the retaining ring on the fuel… - [NTSB FTW86LA167](https://openairdocs.org/ntsb/FTW86LA167.md): Hiller UH-12E · Norias, TX · Accident · No injuries · Limited investigation · Final report · Sep 13, 1986 · N40268 · Substantial damage > The commercial plt was engaged in a livestock round-up and attempted to hover over a wire fence. The acft skid caught on the fence causing a loss of acft control and subsequent impact with the terrain. - [NTSB LAX86FVM08](https://openairdocs.org/ntsb/LAX86FVM08.md): Hiller UH 12E · Gonzales, CA · Accident · No injuries · Final report · Sep 7, 1986 · N149HA · Substantial damage > A loss of power was expereinced as the acft descended into a field at the beginning of an aerial application spray run. The plt initiated a forced landing into the field. During the landing the right skid dug into the field, tipping the helicopter onto its… - [NTSB FTW86FRD24](https://openairdocs.org/ntsb/FTW86FRD24.md): Texas Helicopter OH-13E/M74 · Port Allen, LA · Accident · No injuries · Final report · Sep 3, 1986 · N38092 · Substantial damage > The helicopter experienced partial power loss and descended to ground. It spray booms became entangled in the soy beans. The helicopter started to nose over, then rolled onto its right side and came to rest. Reason for the partial power loss is undetermined. - [NTSB NYC86LA227](https://openairdocs.org/ntsb/NYC86LA227.md): Bell 47J-2A · Newburyport, MA · Accident · No injuries · Limited investigation · Final report · Aug 22, 1986 · N255PH · Substantial damage > The plt experienced a total power loss of the acft eng while practicing autorotations. The helicopter landed hard, the main rotor flexed and severed the tail boom. Post accident inspection of the helicopter revealed the fuel selector was positioned on the… - [NTSB LAX86FVM06](https://openairdocs.org/ntsb/LAX86FVM06.md): Hiller UH21E · Salinas, CA · Accident · No injuries · Final report · Aug 12, 1986 · N169HA · Substantial damage > The plt experienced a 'ratcheting' to the right and a decrease in rotor RPM during cruise flt at 75-100 ft AGL. The plt made an autorotation but could not cushion the landing due to the low alt and lack of rotor RPM. The helicopter impacted hard and… - [NTSB LAX86DVA13](https://openairdocs.org/ntsb/LAX86DVA13.md): Bell 47G-4A · Shafter, CA · Accident · No injuries · Final report · Aug 8, 1986 · N1185W · Substantial damage > Shortly after departing the loading rig, en route to an agricultural aerial application operation, the forward coupling tail rotor drive shaft failed. The helicopter was about 10 ft above ground level and about 100 ft west of the loading rig. The pilot… - [NTSB LAX86DVA09](https://openairdocs.org/ntsb/LAX86DVA09.md): Hiller UH-12E · Delano, CA · Accident · No injuries · Final report · Jun 17, 1986 · N172ET · Substantial damage > The helicopter rotor blade delaminated shortly after departing the operator's north base at Delano, CA. The investigation determined the blade contained extensive voids on the bond line. The blade was rejected by the manufacturer as being unairworthy. The… - [NTSB LAX86FVM05](https://openairdocs.org/ntsb/LAX86FVM05.md): Hiller UH12E · Castroville, CA · Accident · Minor injuries · Final report · Apr 27, 1986 · N5374V · Destroyed > The acft landed hard and rolled over after the lndg skid failed in a forced lndg. The plt said he was crusing at 500 ft AGL over an open field when he heard a loud bang. The helicopter began to vibrate severely and spiral to the right. The plt lost ground… - [NTSB LAX86LA113](https://openairdocs.org/ntsb/LAX86LA113.md): Hiller UH-12E · Lodi, CA · Accident · No injuries · Limited investigation · Final report · Feb 7, 1986 · N62421 · Substantial damage > While on an aerial agricultural spraying flight the acft engine lost total power. The plt executed an immediate autorotation landing. Upon ground contact, the acft skid for about 8 ft until the front skid contacted the ground furrow and nosed over causing the… - [NTSB DEN85LTG06](https://openairdocs.org/ntsb/DEN85LTG06.md): Bell 47G-4A · Minot, ND · Accident · No injuries · Final report · Jul 30, 1985 · N1041B · Substantial damage > The plt was engaged by a deputy sheriff to fly the helicopter about 2-1/2 mi to the Minot intl arpt for impoundment. During takeoff, it began climbing, then the plt lost control & the helicopter entered a descent & crashed. Initial impact occurred about 35 ft… - [NTSB SEA85LA107](https://openairdocs.org/ntsb/SEA85LA107.md): Hiller UH-12E · Fall Creek, OR · Accident · No injuries · Limited investigation · Final report · May 5, 1985 · N28872 · Substantial damage > The helicopter sustained substantial damage during a forced landing following a loss of power. According to the plt, the helicopter was refueled aprx 1 hr flt time prior to the accident. Cause of the power loss was not determined. - [NTSB LAX85FA132](https://openairdocs.org/ntsb/LAX85FA132.md): Hiller UH12E · Five Points, CA · Accident · Minor injuries · Field investigation · Final report · Feb 3, 1985 · N5323V · Substantial damage > While performing an ag flight the helicopter's engin suddenly lost power. At the time the aircraft was near its max allowable gross weight and it was between 3-5FT AGL. As the aircraft yawed left and descended. The pilot in command attempted to land on a… - [NTSB LAX84LA494](https://openairdocs.org/ntsb/LAX84LA494.md): Hiller UH12ET · Yuma, AZ · Accident · Serious injuries · Limited investigation · Final report · Sep 25, 1984 · N9278Z · Destroyed > The pilot stated that he was carrying a load of pesticide for application on a broccoli field. The aircraft was in level flight, approximately 4 to 8 feet AGL when it became uncontrollable and impacted the ground. The aircraft was consumed by a post crash… - [NTSB SEA84LA174](https://openairdocs.org/ntsb/SEA84LA174.md): Hiller UH-12E · Redmond, OR · Accident · Minor injuries · Limited investigation · Final report · Jul 16, 1984 · N1043L · Substantial damage > The acft collided with the ground after a in-flt main rotor blade separation during an aerial application flt. Inspection of the fracture surface of the failed blade revealed characteristics consistant with the high stress, low cycle fatigue. Lab findings… - [NTSB MKC84LA205](https://openairdocs.org/ntsb/MKC84LA205.md): Hiller H-23D · Neelyville, MO · Accident · No injuries · Limited investigation · Final report · Jul 9, 1984 · N48313 · Destroyed > The acft rolled over during an emergency landing. The plt claimed that the rotor disengaged at about 30 ft AGL during takeoff. After the accident the upper half of the yoke control was found fractured. A lab report stated that no materialdefects were related… - [NTSB NYC84LA212](https://openairdocs.org/ntsb/NYC84LA212.md): Hiller 12E · Meadville, PA · Accident · No injuries · Limited investigation · Final report · Jun 17, 1984 · N4033P · Substantial damage > The acft flew into wires during a crop spraying mission. The acft was flying at about 5-10 ft when a flash was seen overhead. The acft vibrated and slowed before impacting the ground and rolling over. - [NTSB DEN84LA177](https://openairdocs.org/ntsb/DEN84LA177.md): Hiller UH-12E · Granby, CO · Accident · No injuries · Limited investigation · Final report · Jun 11, 1984 · N504HA · Substantial damage > The helicopter plt was on a reconnaissance flt to survey a hilltop landing site in mountainous terrain. When he arrived, he made a high reconnaissance pass, then began a low reconnaissance apch. He estimated the wind was from 210 deg at 10 to 15 KTS with… - [NTSB LAX84LA294](https://openairdocs.org/ntsb/LAX84LA294.md): Hiller UH-12E (Soloy) · Delano, CA · Accident · Minor injuries · Limited investigation · Final report · May 10, 1984 · N90461 · Substantial damage > The helicopter experienced an inflt failure of an eng mount, pn 63181-5, which bent the collective control rod & forced the the collective pitch into the up position. The helicopter then settled into the grapes it was spraying & made a hard landing. An… - [NTSB SEA84LA091](https://openairdocs.org/ntsb/SEA84LA091.md): Hiller UH-12E · Buxton, OR · Accident · No injuries · Limited investigation · Final report · Apr 19, 1984 · N56BA · Substantial damage > The helicopter entered an uncontrolled right roll while lifting off from a trailer & struck the ground with the m/r. the plt reported the trailer was not level. - [NTSB LAX84LA194](https://openairdocs.org/ntsb/LAX84LA194.md): Bell 47-G4A · Dixon, CA · Accident · No injuries · Limited investigation · Final report · Feb 24, 1984 · N9017N · Destroyed > The acft crashed during a forced landing after the engine quit. The plt stated that, 'three minutes into the crop dusting mission the engine quit and he suspected fuel mismanagement.' - [NTSB LAX84FA130](https://openairdocs.org/ntsb/LAX84FA130.md): Bell 47J-2 · Kahuku, HI · Accident · 1 fatal · Field investigation · Final report · Jan 1, 1984 · N2097 · Destroyed > About 3 min after takeoff, the helicopter was observed descending in a 'gliding fashion' until water impact. A witness reported that it appeared to be flying straight & did not appear to be in trouble. The witness reported that she could hear the eng & it… Next page: https://openairdocs.org/ntsb.md?engine=41534&page=4 ## 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=3 --- 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.