# NTSB investigations: Lycoming TVO-435-GIA 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 6 · 286 cases ## Cases, newest first - [NTSB LAX96LA263](https://openairdocs.org/ntsb/LAX96LA263.md): Bell 47G3 · Wasco, CA · Accident · No injuries · Limited investigation · Final report · Jul 6, 1996 · N154PG · Substantial damage > the pilot's failure to maintain adequate engine rpm during an aerial application flight. - [NTSB LAX95LA100](https://openairdocs.org/ntsb/LAX95LA100.md): Bell 47G-3B · China Lake, CA · Accident · No injuries · Limited investigation · Final report · Feb 7, 1995 · N73240 · Substantial damage > the pilot's misjudgement of the clearance between the main rotor and a tree while maneuvering at low altitude to herd animals. - [NTSB LAX94LA200](https://openairdocs.org/ntsb/LAX94LA200.md): Bell 47G-3B-1 · Yuma, AZ · Accident · No injuries · Limited investigation · Final report · Apr 17, 1994 · N304JP · Substantial damage > an uncommanded engine deceleration to idle due to the improper installation of the throttle arm on the carburetor shaft. - [NTSB SEA94LA065](https://openairdocs.org/ntsb/SEA94LA065.md): Bell 47G-3B-1 · Gold Hill, OR · Accident · Serious injuries · Limited investigation · Final report · Feb 24, 1994 · N73909 · Destroyed > Separation of the crossover fuel line, and the inability of the pilot in command to maintain a proper rate of descent during the autorotation. - [NTSB SEA94LA042](https://openairdocs.org/ntsb/SEA94LA042.md): Bell 47G3B1 · Mesa, WA · Accident · No injuries · Limited investigation · Final report · Nov 15, 1993 · N1181W · Substantial damage > The pilot's improper flare. Factors include excessive airspeed while approaching the flare. - [NTSB CHI93LA305](https://openairdocs.org/ntsb/CHI93LA305.md): Bell 47G-3B · Clarinda, IA · Accident · Minor injuries · Limited investigation · Final report · Jul 31, 1993 · N8480E · Destroyed > The commercial pilot's failure to maintain adequate clearance from obstacles during aerial application maneuvers. - [NTSB LAX93LA209](https://openairdocs.org/ntsb/LAX93LA209.md): Bell 47-G2 · Antarctica · Accident · No injuries · Limited investigation · Final report · Apr 28, 1993 · N1437 · Substantial damage > The pilot's poorly planned approach. - [NTSB SEA93LA034](https://openairdocs.org/ntsb/SEA93LA034.md): Bell 47G3-B2A · Montpelier, ID · Accident · No injuries · Limited investigation · Final report · Dec 7, 1992 · N58131 · Substantial damage > The loss of engine power due to leaking internal carburetor seals, resulting from improper repair of the carburetor by an acft repair station. - [NTSB MIA93LA014](https://openairdocs.org/ntsb/MIA93LA014.md): Bell 47-G3-B1 · Palm Beach, FL · Accident · Minor injuries · Limited investigation · Final report · Nov 4, 1992 · N94720 · Substantial damage > The pilot's inadequate preflight planning. A factor was the pilot's failure to maintain rotor RPM during the autorotation. - [NTSB NYC92LA159](https://openairdocs.org/ntsb/NYC92LA159.md): Bell 47G-3B-1 · West Mifflin, PA · Accident · No injuries · Limited investigation · Final report · Aug 12, 1992 · N2070P · Substantial damage > A yaw for unknown reason(s) which resulted in the tail rotor contacting the dirt bank and a loss of control. A factor related to the accident was the decision of the pilot to operate in close vicinity to the dirk bank. - [NTSB FTW92LA026](https://openairdocs.org/ntsb/FTW92LA026.md): Bell 47G3B2A · Texarkana, TX · Accident · Serious injuries · Limited investigation · Final report · Nov 24, 1991 · N8134J · Substantial damage > The pilot's failure to maintain proper terrain clearance during takeoff. A factor was his lack of total experience in helicopters. - [NTSB NYC92LA006](https://openairdocs.org/ntsb/NYC92LA006.md): Bell 47G-3B-1 · Catawissa, PA · Accident · Minor injuries · Limited investigation · Final report · Oct 12, 1991 · N5NH · Substantial damage > Pilot factor in that the pilot used poor judgement and loaded more passengers than were seats on the helicopter this resulted in control interference and subsequent loss of control. Contributing was the pilot's failure to check the weight and balance for the… - [NTSB MIA91LA217](https://openairdocs.org/ntsb/MIA91LA217.md): Bell 47G-3B-1 · Penuelas, PR · Accident · No injuries · Limited investigation · Final report · Sep 15, 1991 · N1397X · Substantial damage > Inadvertent control interference by a passenger shortly after takeoff resulting in the loss of control and roll over after touchdown. - [NTSB CHI91LA257](https://openairdocs.org/ntsb/CHI91LA257.md): Bell 47G · Lake Ozark, MO · Accident · No injuries · Limited investigation · Final report · Aug 11, 1991 · N61SD · Substantial damage > Failure of the rotorcraft's tail boom in flight. Factors related to the accident were reduced aircraft control available to the pilot. - [NTSB DEN91LA096](https://openairdocs.org/ntsb/DEN91LA096.md): Bell 47G-3B-1 · Colorado Spring, CO · Accident · No injuries · Limited investigation · Final report · Jul 4, 1991 · N40DP · Substantial damage > The pilot attempting to operate the helicopter outside the design operating envelope. Factors were: high altitude, high temperature, and high density altitude. - [NTSB CHI91DER05](https://openairdocs.org/ntsb/CHI91DER05.md): Bell 47G3B1 · Lasalle, MN · Accident · No injuries · Final report · Jun 11, 1991 · N73284 · Substantial damage > The pilot's failure to maintain adequate clearance from the terrain. A related factor is the pilot's misjudged altitude above the crop. - [NTSB SEA91LA109](https://openairdocs.org/ntsb/SEA91LA109.md): Bell 47G-3B-1 · Malott, WA · Accident · No injuries · Limited investigation · Final report · May 19, 1991 · N73903 · Destroyed > An undetermined failure of the fuel pump casing resulting in an in flight fire and loss of engine power. - [NTSB ATL91FA013](https://openairdocs.org/ntsb/ATL91FA013.md): Bell 47J-2 · Gatlinburg, TN · Accident · Serious injuries · Field investigation · Final report · Nov 1, 1990 · N49DA · Destroyed > The accident was inadequate maintenance of the helicopter, allowing a tail rotor drive shaft bearing to exceed wear limits. This resulted in high loads on the tail rotor drive shaft, and the resulting fatigue failure of the drive shaft. - [NTSB CHI90DER03](https://openairdocs.org/ntsb/CHI90DER03.md): Bell 47G3B1 · Coon Rapids, MN · Accident · No injuries · Final report · Jul 31, 1990 · N4990H · Substantial damage > The pilot-in-command's inaccurate fuel consumption calculations and misjudgement of his fuel supply. - [NTSB MIA90LA125](https://openairdocs.org/ntsb/MIA90LA125.md): Bell 47G-3B-1 · Lake Wales, FL · Accident · Minor injuries · Limited investigation · Final report · May 21, 1990 · N1390X · Destroyed > The pilot's failure to maintain adequate clearance between the main rotor blades and a power line pole while maneuvering during an aerial application flight. - [NTSB FTW90DPA03](https://openairdocs.org/ntsb/FTW90DPA03.md): Bell-Moore 47G-2A · Sivell Bend, TX · Accident · No injuries · Final report · May 8, 1990 · N25126 · Substantial damage > Clearance was not maintained by the pilot-in-command. - [NTSB SEA90LA048](https://openairdocs.org/ntsb/SEA90LA048.md): Bell BH-47G3B2 · Des Moines, WA · Accident · Minor injuries · Limited investigation · Final report · Mar 1, 1990 · N4073G · Destroyed > Partial loss of engine power, cause undetermined. The aircraft was not recovered and examination of the engine was not possible. - [NTSB ATL90LA030](https://openairdocs.org/ntsb/ATL90LA030.md): Bell 47G-3B1 · Ewell, AL · Accident · Serious injuries · Limited investigation · Final report · Nov 25, 1989 · N1358X · Substantial damage > The loss of engine power, for undetermined reasons, at low altitude during a practice autorotation. Contributing to the accident was the instructor's failure to properly plan the demonstrated autorotation so as to preclude an accident, in the event that power… - [NTSB SEA89LA175](https://openairdocs.org/ntsb/SEA89LA175.md): Bell 47G3B2 · Monitor, WA · Accident · 1 fatal · Limited investigation · Final report · Sep 18, 1989 · N83111 · Destroyed > The pilot failed to maintain aircraft separation from obstacles on the ground. A factor in the accident was the bright glare from the rising sun. - [NTSB SEA89LA116](https://openairdocs.org/ntsb/SEA89LA116.md): Bell 47G3B2A · Dyer, NV · Accident · Minor injuries · Limited investigation · Final report · Jun 22, 1989 · N59414 · Destroyed > The pilots poor planning in attempting a hover in undesirable conditions which resulting in the inability to maintain rotor rom. Contributing to the accident was the mountainous terrain and high density alt. - [NTSB LAX89DVA03](https://openairdocs.org/ntsb/LAX89DVA03.md): Bell 47G-3B2 · Strathmore, CA · Accident · Serious injuries · Final report · Feb 1, 1989 · N2918W · Destroyed > Improper compensation for wind conditions by the pilot, and his failure to maintain clearance from the service truck. Factors relating to the accident were: the unfavorable (variable) and gusty wind conditions and close proximity of the service vehicle. - [NTSB DEN88LA135](https://openairdocs.org/ntsb/DEN88LA135.md): Bell 47G · Terry, MT · Accident · Serious injuries · Limited investigation · Final report · Jun 25, 1988 · N2243W · Substantial damage > The aircraft was on a ferry flight from alpine, WY. To belfield, ND. The plt departed alpine at approximately 0950 and made several enroute stops to refuel. The plt intended to land at miles city, MT to refuel but he got lost and flew to Terry, MT, located 38… - [NTSB DEN88FA106](https://openairdocs.org/ntsb/DEN88FA106.md): Bell 47G-3B1 · Cortez, CO · Accident · 1 fatal · Field investigation · Final report · May 7, 1988 · N8455E · Destroyed > The plt said that he had just taken off and reached an alt of about 300 ft when his collective control went 'limp'. The helicopter entered a descent, partially controlled by the plt using throttle and cyclic control inputs. The helicopter touched down in soft… - [NTSB DEN87LA235](https://openairdocs.org/ntsb/DEN87LA235.md): Bell 47-G3B2 · Oakley, UT · Accident · No injuries · Limited investigation · Final report · Sep 10, 1987 · N1038X · Substantial damage > The plt had just taken off from a confined area surrounded on two sides with electrical power lines. As he attempted to climb, he said his RPM began to bleed off. He stated that he made a right pedal turn to avoid the wires but was unable to prevent a hard… - [NTSB SEA87LA118](https://openairdocs.org/ntsb/SEA87LA118.md): Bell 47G-3B-2 · Milton-Freewatr, OR · Accident · Minor injuries · Limited investigation · Final report · Jun 12, 1987 · N2219W · Destroyed > The pilot was hovering up rising terrain at a slow airspeed, at 15 feet above the ground while on an agricultural spraying flight and encountered settling with power. The aircraft entered an uncontrolled descent and impacted the ground. - [NTSB DEN87LA120](https://openairdocs.org/ntsb/DEN87LA120.md): Bell 47G3B2A · Brigham City, UT · Accident · No injuries · Limited investigation · Final report · May 8, 1987 · N58131 · Substantial damage > An ag plt was ferrying a helicopter to another job in his local area. The plt, an ATP, had estimated that the helicopter had enough fuel for the flt. The helicopter's engine quit and an autorotation was performed, resulting in a hard landing. Less than one… - [NTSB FTW87GA083](https://openairdocs.org/ntsb/FTW87GA083.md): Bell 47G-3B-1 · Odessa, TX · Accident · No injuries · Final report · Mar 21, 1987 · N62462 · Substantial damage > Investigation reveals the helicopter touched down on the heel of its skids, left skid first, and at a slightly low rotor RPM. The tail boom then moved upward while the main rotor blades flexed downward. The main rotor blades contacted and severed the tail… - [NTSB DEN87LA019](https://openairdocs.org/ntsb/DEN87LA019.md): Bell 47G-3B-1 · Goshen, UT · Accident · No injuries · Limited investigation · Final report · Nov 10, 1986 · N47042 · Substantial damage > The plt was practicing power recovery autorotations then attempted one power off, full stop. The plt allowed the main rotor RPM to decay during approach and took no corrective action. The acft landed hard with slight forward motion and the plt applied aft… - [NTSB SEA86LA182](https://openairdocs.org/ntsb/SEA86LA182.md): Bell 47G3B1 · Albany, OR · Accident · Serious injuries · Limited investigation · Final report · Jul 29, 1986 · N9417A · Substantial damage > A Bell 47G3B1 crashed into the south santiam river after contacting power lines while on an instructional flight. The CFI (helicopter) plt received serious injuries and the private plt (airplane) helicopter student received minor injuries. The helicopter… - [NTSB SEA86LA176](https://openairdocs.org/ntsb/SEA86LA176.md): Bell 47G-3B1 · Burbank, WA · Accident · 1 fatal · Limited investigation · Final report · Jul 23, 1986 · N1197W · Minor damage > The helicopter had landed for reloading and was stationary with rotors idling. A ground loader person approached the helicopter over a small sandy knoll and was struck by the main rotor, sustaining fatal injury. - [NTSB ATL86LA138](https://openairdocs.org/ntsb/ATL86LA138.md): Bell 47G-3B · Red Bay, AL · Accident · No injuries · Limited investigation · Final report · May 19, 1986 · N73269 · Substantial damage > The pilot had completed a dispensing operation and was returning to the ag staging area to refuel. As the helicopter hovered towards the parked refueling vehicle, the main rotor blades struck a metal structure attached to the truck. The pilot stated that the… - [NTSB MIA86LA152](https://openairdocs.org/ntsb/MIA86LA152.md): Bell 47G-3B-1 · Panama City, FL · Accident · No injuries · Limited investigation · Final report · May 9, 1986 · N1159W · Substantial damage > While approaching to land during a sightseeing flt a loss of eng pwr was experienced and an autorotation was made 70 ft short of the helipad. During touchdown, the main rotor struck and severed the tail boom. The plt stated after touchdown the eng continued… - [NTSB DEN86LA119](https://openairdocs.org/ntsb/DEN86LA119.md): Bell 47G-3B-2 · Santa Fe, NM · Accident · No injuries · Limited investigation · Final report · Apr 25, 1986 · N4073G · Substantial damage > According to the student plt, he was attempting to hover the helicopter when he encountered turbulence. The student plt stated that the hard landing which followed resulted in spreading the skids & severing the tailboom. - [NTSB SEA86LA105](https://openairdocs.org/ntsb/SEA86LA105.md): Bell 47G3B1 · Albany, OR · Accident · No injuries · Limited investigation · Final report · Apr 15, 1986 · N9417A · Substantial damage > The plt reported that after aprx 15 minutes of flt, the eng sputtered 2 or 3 times. An autorotation was performed onto rough terrain during which the tail rotor drive shaft was damaged by the main rotor blades. Post accident inspection revealed a hole in the… - [NTSB DEN86LA079](https://openairdocs.org/ntsb/DEN86LA079.md): Bell 47G3 B-2 · Grand Junction, CO · Accident · Minor injuries · Limited investigation · Final report · Feb 18, 1986 · N1424W · Substantial damage > The plt stated that while turning to the intended landing area, the helicopter he was piloting encountered both downdrafts & tailwind. The plt indicated the helicopter settled until grnd contact. - [NTSB SEA85LA174](https://openairdocs.org/ntsb/SEA85LA174.md): Bell 47G-3B-1 · Lebanon, OR · Accident · No injuries · Limited investigation · Final report · Jul 19, 1985 · N9417A · Substantial damage > The plt stated he performed 4 circling approaches over a sand bar and on the 5th approcah, rotor RPM decayed. Unable to regain the RPM, a hard landing resulted during which the main rotor blades severed the tailrotor. - [NTSB SEA85LA178](https://openairdocs.org/ntsb/SEA85LA178.md): Bell 47G-3B-1 · Idaho City, ID · Accident · No injuries · Limited investigation · Final report · Jun 11, 1985 · N1333X · Substantial damage > While the student plt was on a x-country flt, the eng lost power after the supercharger failed. The plt stated that he was unable to maintain altitude & RPM; he subsequently made a forced landing in a heavily timbered, mountainous area. - [NTSB DEN85LA144](https://openairdocs.org/ntsb/DEN85LA144.md): Continental Copters Tomcat Mark 5A/OH13H · Freeman, SD · Accident · Minor injuries · Limited investigation · Final report · May 29, 1985 · N9081T · Substantial damage > The plt said he had completed 4 to 5 swath runs (crop spraying mission). During a turning manuever with a left quatering tail wind, full left pedal,full pwr,the helicopter had a high sink rate until grd impact. - [NTSB DEN84LA260](https://openairdocs.org/ntsb/DEN84LA260.md): Bell 47G · West Glacier, MT · Accident · No injuries · Limited investigation · Final report · Aug 5, 1984 · N7965J · Substantial damage > Following in-flight power loss the pilot performed an autorotation to a forced landing on a highway. On touchdown, the main rotor made contact with a passing motor home. Investigation revealed no fuel on board, although the pilot calculated 0.6 hours of fuel… - [NTSB SEA84LA162](https://openairdocs.org/ntsb/SEA84LA162.md): Bell 47G-3B · Eagle Point, OR · Accident · Minor injuries · Limited investigation · Final report · Jul 5, 1984 · N73224 · Substantial damage > The acft main rotor struck the ground during landing. The commercial plt had taken 2 passengers for a sight seeing tour and during landing he said one of them grabbed his right arm at 4 ft AGL and he was unable to recover before ground contact. - [NTSB CHI84LA232](https://openairdocs.org/ntsb/CHI84LA232.md): Bell 47G · Fairfax, MN · Accident · Minor injuries · Limited investigation · Final report · Jun 13, 1984 · N501H · Substantial damage > The helicopter plt turned at the end of a spray run & the acft collided with a power line. He said that because of a quartering tailwind, the helicopter was in a nose high attitude & the tail rotor hit a wire. The plt was able to make an autorotation after… - [NTSB DEN84LA079](https://openairdocs.org/ntsb/DEN84LA079.md): Bell 47G-3B-1 · Ogden, UT · Accident · No injuries · Limited investigation · Final report · Jan 31, 1984 · N90769 · Substantial damage > The plt took off from a mountainous work site to return to salt lake city, UT. The wx was clear at the work site (elevation 6700 ft), but there was fog below. After encountering the fog, the plt hovered with a slow forward speed over snow covered terrain. A… - [NTSB ATL84FA001](https://openairdocs.org/ntsb/ATL84FA001.md): Bell 47G-3B1 · Pliny, WV · Accident · 1 fatal · Field investigation · Final report · Oct 1, 1983 · N1334X · Destroyed > The helicopter was being used in the construction of elect transmission lines. A 150-FT longline cable had been utilizedon an earlier flight for lifting external loads. However, there was no reason for the longline to be attached on the accident flight as the… - [NTSB MKC83FA196](https://openairdocs.org/ntsb/MKC83FA196.md): Bell 47G-3B · Paxton, NE · Accident · Serious injuries · Field investigation · Final report · Aug 18, 1983 · N73248 · Destroyed > The plt stated that after landing on a truck platform, he did not decrease rotor RPM & did not lower collective to flat pitch as he was attempting to recover a piece of paper that had fallen to the floor on the right side of the cockpit. As he released the… - [NTSB LAX83FA366](https://openairdocs.org/ntsb/LAX83FA366.md): Bell 47G-3B-1 · S. Lake Tahoe, CA · Accident · Serious injuries · Field investigation · Final report · Jul 31, 1983 · N11102 · Destroyed > During takeoff over descending terrain in a mountainous area, the RPM began decaying when the helicopter had accelerated to 40 KTS & was about 75 ft AGL. The plt applied more throttle & increased the collective, then noted that the manifold pressure was… Next page: https://openairdocs.org/ntsb.md?engine=41526&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 ('41526')) ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC ``` This list as a web page: https://openairdocs.org/ntsb?engine=41526&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.