# NTSB investigations: Lycoming VO-435 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 13 · 629 cases

## Cases, newest first

- [NTSB LAX98LA309](https://openairdocs.org/ntsb/LAX98LA309.md): Texas Helicopter OH-13H · Gilroy, CA · Accident · No injuries · Limited investigation · Final report · Sep 26, 1998 · N1001G · Destroyed
  > The pilot's loss of control for undetermined reasons.
- [NTSB CHI98LA292](https://openairdocs.org/ntsb/CHI98LA292.md): Bell M74L · Grand Forks, ND · Accident · No injuries · Limited investigation · Final report · Jul 31, 1998 · N1001N · Substantial damage
  > The worn rotor clutch shoes, and subsequent loss of main rotor rpm.
- [NTSB LAX98LA225](https://openairdocs.org/ntsb/LAX98LA225.md): Bell 47G-5 · Salinas, CA · Accident · Minor injuries · Limited investigation · Final report · Jul 7, 1998 · N7914S · Destroyed
  > The failure of the pilot to maintain clearance with the telephone lines.
- [NTSB MIA98LA154](https://openairdocs.org/ntsb/MIA98LA154.md): Bell 47G-2 · Fort Walton Bch, FL · Accident · Minor injuries · Limited investigation · Final report · May 9, 1998 · N6714D · Substantial damage
  > The loss of engine power for undetermined reasons.
- [NTSB NYC98LA023](https://openairdocs.org/ntsb/NYC98LA023.md): Hiller UH-12D · Farmingdale, NJ · Accident · No injuries · Limited investigation · Final report · Oct 24, 1997 · N62316 · Substantial damage
  > The certificated flight instructor's inadequate supervision and failure to maintain directional control.
- [NTSB LAX98LA001](https://openairdocs.org/ntsb/LAX98LA001.md): Bell 47G-2 · Burbank, CA · Accident · No injuries · Limited investigation · Final report · Oct 3, 1997 · N2483B · Substantial damage
  > A loss of engine power for undetermined reasons.
- [NTSB CHI97LA306](https://openairdocs.org/ntsb/CHI97LA306.md): Bell 47 · Pipestone, MN · Accident · Serious injuries · Limited investigation · Final report · Sep 30, 1997 · N9005T · Substantial damage
  > the fracture of the pitch control rod assembly.
- [NTSB FTW97LA264](https://openairdocs.org/ntsb/FTW97LA264.md): Bell 47G-3B-1 · Crossett, AR · Accident · Serious injuries · Limited investigation · Final report · Jul 13, 1997 · N83701 · Substantial damage
  > failure of maintenance personnel to perform an adequate inspection of the fuselage center frame and detect a fatigue fracture of a longeron tube on the upper left side of the center frame, which resulted in a disconnect of the tail rotor drive shaft from the…
- [NTSB LAX97LA006](https://openairdocs.org/ntsb/LAX97LA006.md): Bell 47G-5A · King City, CA · Accident · No injuries · Limited investigation · Final report · Oct 7, 1996 · N8135J · Substantial damage
  > the pilot's failure to maintain adequate rotor rpm during the takeoff initial climb.
- [NTSB CHI97LA004](https://openairdocs.org/ntsb/CHI97LA004.md): Bell 47G-5 · Nunda, SD · Accident · No injuries · Limited investigation · Final report · Oct 6, 1996 · N7925J · Substantial damage
  > failure of maintenance personnel to properly torque the six accessory drive bolts, which resulted in fatigue failure of the undertorqued bolts.
- [NTSB LAX96LA326](https://openairdocs.org/ntsb/LAX96LA326.md): Bell 47-G5 · Riverside, CA · Accident · No injuries · Limited investigation · Final report · Aug 30, 1996 · N57RA · Substantial damage
  > The pilot's inaccurate perception of altitude which resulted in an improper flare and subsequent hard landing, and non use of the landing light.
- [NTSB LAX96LA287](https://openairdocs.org/ntsb/LAX96LA287.md): Bell 47-G5 · Lost Hills, CA · Accident · No injuries · Limited investigation · Final report · Jul 23, 1996 · N7885S · Substantial damage
  > improper installation of the carburetor air box.
- [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 LAX96LA111](https://openairdocs.org/ntsb/LAX96LA111.md): Bell 47G-2A1 · Honiara, Solomon Islands · Accident · 1 fatal · Limited investigation · Final report · Jan 29, 1996 · N6569H · Destroyed
  > the pilot and the ship crew's failure to assure the tie down strap was removed prior to liftoff.
- [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 SEA95LA227](https://openairdocs.org/ntsb/SEA95LA227.md): Texas Helicopter OH-13E · Yakima, WA · Accident · No injuries · Limited investigation · Final report · Sep 20, 1995 · N38115 · Substantial damage
  > Fatigue failure of the bolt attaching the scissor arm assembly to the pitch control support assembly. The failure of the bolt led to a loss of collective pitch control and reduced rotor RPM.
- [NTSB ATL95LA145](https://openairdocs.org/ntsb/ATL95LA145.md): Bell 47G2 · Montrose, GA · Accident · No injuries · Limited investigation · Final report · Jul 31, 1995 · N6145C · Substantial damage
  > The pilot's inadequate preflight planning and visual lookout.
- [NTSB FTW95LA310](https://openairdocs.org/ntsb/FTW95LA310.md): Williams Bell OH13H/Tomcat MK5A · Alicia, AR · Accident · Serious injuries · Limited investigation · Final report · Jul 21, 1995 · N3771W · Substantial damage
  > The pilot's failure to remove the refueling hose. A factor was that he diverted his attention from the refueling operation.
- [NTSB LAX95LA216](https://openairdocs.org/ntsb/LAX95LA216.md): Bell 47-G5 · Coalinga, CA · Accident · No injuries · Limited investigation · Final report · Jun 18, 1995 · N7923J · Destroyed
  > clutch slippage for undetermined reasons. A factor in the accident was the helicopter's low above ground altitude, which limited the pilot's time and ability to recover main rotor rpm.
- [NTSB LAX95LA213](https://openairdocs.org/ntsb/LAX95LA213.md): Bell 47-G2A · Bakersfield, CA · Accident · No injuries · Limited investigation · Final report · Jun 18, 1995 · N73260 · Substantial damage
  > the pilot's failure to maintain adequate lateral clearance from the irrigation standpipe while applying chemicals to a field.
- [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 NYC95LA100](https://openairdocs.org/ntsb/NYC95LA100.md): Bell 47G-5A · Middleboro, MA · Accident · Minor injuries · Limited investigation · Final report · May 4, 1995 · N444GW · Substantial damage
  > the pilot's failure to maintain airspeed during a low altitude aerial application turn, which resulted in inadvertent settling with power and the subsequent collision with the terrain.
- [NTSB LAX95LA138](https://openairdocs.org/ntsb/LAX95LA138.md): Bell 47 · Harmon Field · Accident · No injuries · Limited investigation · Final report · Mar 17, 1995 · N6569H · Substantial damage
  > an engine failure due to oil exhaustion from a missing oil pressure relief valve as the result of an improper maintenance inspection.
- [NTSB CHI95LA003](https://openairdocs.org/ntsb/CHI95LA003.md): Bell 47G2 · Decatur, IL · Accident · Minor injuries · Limited investigation · Final report · Oct 3, 1994 · N5193B · Substantial damage
  > the failure of the roller springs in the freewheeling unit of the transmission which caused the unit to disengage.
- [NTSB LAX94LA386](https://openairdocs.org/ntsb/LAX94LA386.md): Bell 47G-5 · Pacific Ocean (Pacific Ocean) · Accident · 2 fatal · Limited investigation · Final report · Sep 17, 1994 · N2280W · Substantial damage
  > an in-flight collision with the water for undetermined reasons.
- [NTSB LAX94LA303](https://openairdocs.org/ntsb/LAX94LA303.md): Bell 47G-2A · Scottsdale, AZ · Accident · No injuries · Limited investigation · Final report · Jul 30, 1994 · N6749D · Substantial damage
  > The pilot's failure to refuel appropriately, the altitude and airspeed at the time the engine stoppage occurred were factors in the accident.
- [NTSB CHI94T#A02](https://openairdocs.org/ntsb/CHI94T%23A02.md): Continental Copters MK 5 Tomcat · Minot, ND · Accident · No injuries · Class 3 · Final report · Jul 5, 1994 · N9043T · Substantial damage
- [NTSB NYC94LA110](https://openairdocs.org/ntsb/NYC94LA110.md): Bell 47-G5 · Wareham, MA · Accident · Minor injuries · Limited investigation · Final report · Jul 2, 1994 · N59400 · Substantial damage
  > The pilot's inadequate inflight planning which resulted in fuel exhaustion and the loss of engine power.
- [NTSB FTW94FA158](https://openairdocs.org/ntsb/FTW94FA158.md): Bell 47G-2 · Tulsa, OK · Accident · 1 fatal · Field investigation · Final report · May 16, 1994 · N47GY · Destroyed
  > In flight loss of control due to the pilot's improper use of the cyclic and collective controls when he maneuvered abruptly to avoid colliding with a flock of birds. Factors were the birds and the inflight separation of the left synchronized elevator.
- [NTSB LAX94LA199](https://openairdocs.org/ntsb/LAX94LA199.md): Continental Copters Tomcat MK5A · Brawley, CA · Accident · 1 fatal · Limited investigation · Final report · Apr 22, 1994 · N9061T · Destroyed
  > Failure of the pilot to maintain sufficient altitude, while maneuvering to land after completing aerial application. Factors related to the accident were: darkness and the lack of visual cues for the pilot to detect the obstruction (power line).
- [NTSB CHI94FA330](https://openairdocs.org/ntsb/CHI94FA330.md): Bell 47G-5A · Wisconsin Rpds, WI · Accident · 1 fatal · Field investigation · Final report · Mar 22, 1994 · N2991W · Destroyed
  > Undetermined.
- [NTSB CHI94LA133](https://openairdocs.org/ntsb/CHI94LA133.md): Bell 47-62 · Aurora, MO · Accident · No injuries · Limited investigation · Final report · Mar 5, 1994 · N6711D · Substantial damage
  > The dual students inadequate flare and the pilot in command's (flight instructor) delayed remedial action.
- [NTSB NYC94LA050](https://openairdocs.org/ntsb/NYC94LA050.md): Bell 47G-5 · Plymouth, MA · Accident · Serious injuries · Limited investigation · Final report · Mar 1, 1994 · N7043J · Substantial damage
  > The pilot's failure to maintain adequate clearance of the fuel truck from the aircraft, which resulted in the main rotor striking the fuel hose and truck during refueling operation. A factor was the pilot's failure to follow company policy pertaining to the…
- [NTSB SEA94LA064](https://openairdocs.org/ntsb/SEA94LA064.md): Hiller-Soloy H-23D · Seaside, OR · Accident · Minor injuries · Limited investigation · Final report · Feb 23, 1994 · N62413 · Destroyed
  > The pilot's improper use of flight controls resulting in settling with power.
- [NTSB ATL94LA009](https://openairdocs.org/ntsb/ATL94LA009.md): Bell 47G2 · Billingsley, AL · Accident · No injuries · Limited investigation · Final report · Oct 25, 1993 · N866Z · Substantial damage
  > The pilot's improper vertical liftoff which resulted in dynamic roll-over and the main rotor's impact with the ground.
- [NTSB CHI93DEP05](https://openairdocs.org/ntsb/CHI93DEP05.md): Bell 47-G5 · Fulton, WI · Accident · Minor injuries · Final report · Aug 25, 1993 · N1464W · Substantial damage
  > the failure (fracture) of the number one cylinder intake valve retainer (keeper).
- [NTSB CHI93LA320](https://openairdocs.org/ntsb/CHI93LA320.md): Bell 47-G5 · Schaumburg, IL · Accident · Minor injuries · Limited investigation · Final report · Aug 12, 1993 · N1347X · Substantial damage
  > the pilot's improper autorotation techniques.
- [NTSB DEN93LA091](https://openairdocs.org/ntsb/DEN93LA091.md): Continental Copters Tomcat MK5A · Duson, LA · Accident · No injuries · Limited investigation · Final report · Jul 30, 1993 · N9014T · Substantial damage
  > Failure of the transmission mast bearing, resulting in oil contamination and subsequent blockage of the internal oil ports and passages. Factors were: total loss of collective control and partial loss of cyclic control.
- [NTSB FTW93LA178](https://openairdocs.org/ntsb/FTW93LA178.md): Bell-Transworld 47G-2 · Wynne, AR · Accident · No injuries · Limited investigation · Final report · Jun 5, 1993 · N9238Z · Substantial damage
  > Partial power loss due to the failure of one magneto. A factor was the lack of suitable terrain for the forced landing.
- [NTSB CHI93LA179](https://openairdocs.org/ntsb/CHI93LA179.md): Bell 47 · Berlin, WI · Accident · Minor injuries · Limited investigation · Final report · May 21, 1993 · N8458E · Destroyed
  > The pilot-in-command's failure to see the obstruction.
- [NTSB LAX93LA157](https://openairdocs.org/ntsb/LAX93LA157.md): Bell 47G5 · Greenfield, CA · Accident · Minor injuries · Limited investigation · Final report · Mar 20, 1993 · N7080J · Substantial damage
  > The pilot's failure to maintain an adequate clearance from the power lines while performing an aerial application run.
- [NTSB MIA93LA076](https://openairdocs.org/ntsb/MIA93LA076.md): Huddleston-Bell 47G2 · Rio Grande, PR · Accident · Minor injuries · Limited investigation · Final report · Feb 28, 1993 · N37870 · Substantial damage
  > Poor in-flight planning by the pilot-in-command. Contributing to the accident was the flight's lack of total experience.
- [NTSB MIA93LA027](https://openairdocs.org/ntsb/MIA93LA027.md): Bell 47-G5A · Belle Glade, FL · Accident · Minor injuries · Limited investigation · Final report · Dec 7, 1992 · N7925J · Substantial damage
  > The improper in flight decision of the pilot in command to attempt an agricultural turn with insufficient altitude to accomplish the maneuver. Contributing to the accident was the pilot's overconfidence in his abilities.
- [NTSB LAX92LA378](https://openairdocs.org/ntsb/LAX92LA378.md): Texas Helicopter OH-13E/M74 · Chandler, AZ · Accident · No injuries · Limited investigation · Final report · Sep 6, 1992 · N38099 · Substantial damage
  > The pilot's misjudging the performance and weight and balance data of the helicopter prior to departure. Contributing to the accident was a failure of the pilot to jettison the chemical load.
- [NTSB FTW92DPG15](https://openairdocs.org/ntsb/FTW92DPG15.md): Bell-Transworld 47G-2 · Birdeye, AR · Accident · No injuries · Final report · Aug 19, 1992 · N9238Z · Substantial damage
  > Fuel contamination. A factor was the high density altitude.
- [NTSB ATL92LA160](https://openairdocs.org/ntsb/ATL92LA160.md): Bell 47G-2 · Slocomb, AL · Accident · Serious injuries · Limited investigation · Final report · Aug 15, 1992 · N2880B · Substantial damage
  > A hard landing due to a power loss from fuel exhaustion. A factor in the accident was the lack of sustable terrain for the landing.
- [NTSB LAX92LA278](https://openairdocs.org/ntsb/LAX92LA278.md): Bell 47G5 · Mesa, AZ · Accident · Minor injuries · Limited investigation · Final report · Jul 4, 1992 · N4798R · Destroyed
  > A partial loss of engine power due to unknown reason (s). Factors in this accident were 1) low altitude when the partial loss of power occurred 2) low rotor RPM as a result of the loss of power, and 3) the pilot not being able to take remedial action due to…
- [NTSB MIA92T#A01](https://openairdocs.org/ntsb/MIA92T%23A01.md): Continental Copters Tomcat MK6B · Punta Gorda, FL · Accident · No injuries · Class 3 · Final report · Jun 25, 1992 · N17H · Substantial damage
- [NTSB LAX92LA262](https://openairdocs.org/ntsb/LAX92LA262.md): Bell 47-G5A · Pago Pago (Pacific Ocean) · Accident · Serious injuries · Limited investigation · Final report · Jun 21, 1992 · N211CB · Substantial damage
  > The pilot's inadequate preflight inspection in failing to ensure that all skid tiedowns were removed prior to the attempted takeoff.

Next page: https://openairdocs.org/ntsb.md?engine=41525&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 ('41525'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?engine=41525&page=3

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