# 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 2 of 13 · 629 cases

## Cases, newest first

- [NTSB CEN09LA324](https://openairdocs.org/ntsb/CEN09LA324.md): Bell 47G · Kyle, TX · Accident · Serious injuries · Limited investigation · Final report · May 30, 2009 · N4823 · Substantial damage
  > The ground crewmember's failure to assure that the fuel nozzle was closed before pressurizing the line. Contributing to the accident was the lack of an available fire extinguisher.
- [NTSB CHI08CA019](https://openairdocs.org/ntsb/CHI08CA019.md): Bell 47G-2A · Wautoma, WI · Accident · No injuries · Data collection · Final report · Oct 17, 2007 · N73223 · Substantial damage
  > The pilot's failure to maintain control of the helicopter resulting from a distraction in the cockpit. A contributing factor was the distraction due to the dog in the cockpit.
- [NTSB DFW07CA156](https://openairdocs.org/ntsb/DFW07CA156.md): Bell 47G-2A · Mercedes, TX · Accident · Minor injuries · Data collection · Final report · Jul 11, 2007 · N7878 · Substantial damage
  > The pilot's failure to maintain clearance from the power transmission line.
- [NTSB CHI07CA212](https://openairdocs.org/ntsb/CHI07CA212.md): Bell 47G-5 · Jesup, IA · Accident · No injuries · Data collection · Final report · Jul 10, 2007 · N8140J · Substantial damage
  > The pilot's inability to maintain control of the helicopter when it unexpectedly encountered a whirlwind shortly after takeoff.
- [NTSB ATL07LA052](https://openairdocs.org/ntsb/ATL07LA052.md): Bell 47G2A · Huntsville, AL · Accident · Minor injuries · Limited investigation · Final report · Mar 17, 2007 · N471KC · Destroyed
  > The loss of engine power due to undetermined reasons.
- [NTSB DEN06CA124](https://openairdocs.org/ntsb/DEN06CA124.md): Bell 47G-2 · Hayden, AL · Accident · No injuries · Data collection · Final report · Sep 9, 2006 · N23947 · Destroyed
  > engine fire for reasons undetermined.
- [NTSB LAX06CA180](https://openairdocs.org/ntsb/LAX06CA180.md): Bell 47-G5 · Soledad, CA · Accident · No injuries · Data collection · Final report · May 23, 2006 · N4741R · Substantial damage
  > fuel exhaustion due to the pilot's inaccurate fuel consumption calculations and failure to refuel the helicopter which resulted in a loss of engine power.
- [NTSB DFW06CA123](https://openairdocs.org/ntsb/DFW06CA123.md): Bell 47G-2 · Rosenberg, TX · Accident · Minor injuries · Data collection · Final report · May 10, 2006 · N993B · Substantial damage
  > The pilots encounter with loss of tail rotor effectiveness during an aerial application flight. A contributing factor was the gusty winds.
- [NTSB NYC06FA100](https://openairdocs.org/ntsb/NYC06FA100.md): Bell 47G-3B-1 · East Hanover Tw, PA · Accident · 2 fatal · Field investigation · Final report · Apr 20, 2006 · N22MP · Destroyed
  > The pilot's improper decision to hover out-of-ground-effect in a tailwind, and his failure to maintain aircraft control. A factor in the accident was the tailwind.
- [NTSB ATL05CA161](https://openairdocs.org/ntsb/ATL05CA161.md): Bell 47G-3B · Summerville, TN · Accident · Minor injuries · Data collection · Final report · Sep 15, 2005 · N8483E · Substantial damage
  > The pilot's failure to maintain adequate clearance and adequate visual lookout during take-off which resulted in an in-flight collision with a tree and roll over.
- [NTSB SEA05LA138](https://openairdocs.org/ntsb/SEA05LA138.md): Bell 47G-2A · Oroville, WA · Accident · No injuries · Limited investigation · Final report · Jul 5, 2005 · N38926 · Substantial damage
  > The failure of the throttle cable housing, which permitted the engine's RPM to decay to the idle position. Contributing factors were the trees and the lack of suitable terrain for a forced landing.
- [NTSB DEN05CA078](https://openairdocs.org/ntsb/DEN05CA078.md): Bell 47G-5A · Brush, CO · Accident · No injuries · Data collection · Final report · May 19, 2005 · N59403 · Substantial damage
  > The pilot's failure to maintain clearance from the truck trailer during takeoff. A factor contributing to this accident was the truck trailer.
- [NTSB CHI05CA147](https://openairdocs.org/ntsb/CHI05CA147.md): Bell 47G · Twin Brooks, SD · Accident · Minor injuries · Data collection · Final report · May 19, 2005 · N8505F · Substantial damage
  > The pilot's inadequate lookout and his failure to maintain clearance with the power lines. A factor was the low altitude at which the helicopter was operating.
- [NTSB CHI04CA229](https://openairdocs.org/ntsb/CHI04CA229.md): Bell 47G2 · Muncie, IN · Accident · No injuries · Data collection · Final report · Aug 14, 2004 · N96MB · Destroyed
  > The engine failure for an undetermined reason, and the pilot's inability to properly level-off for landing due to the low rotor speed, which resulted in the hard landing. The low altitude where the engine failure occurred was a factor.
- [NTSB FTW04CA207](https://openairdocs.org/ntsb/FTW04CA207.md): Bell 47G-3B-1 · Troy, TX · Accident · No injuries · Data collection · Final report · Aug 5, 2004 · N47713 · Substantial damage
  > The flight instructor's improper flare, resulting in a hard landing. A contributing factor was the high density altitude.
- [NTSB CHI04CA180](https://openairdocs.org/ntsb/CHI04CA180.md): Texas Helicopter M-74 · Clear Lake, MN · Accident · No injuries · Data collection · Final report · Jul 9, 2004 · N10009 · Substantial damage
  > The pilot failed to maintain a proper glidepath to the landing zone. A factor was the truck pad.
- [NTSB LAX04LA158](https://openairdocs.org/ntsb/LAX04LA158.md): Quinn E L Tom Cat MK-5A · Galt, CA · Accident · No injuries · Limited investigation · Final report · Mar 15, 2004 · N8429 · Substantial damage
  > a loss of engine power due to water contamination of the fuel system.
- [NTSB MIA04FA008](https://openairdocs.org/ntsb/MIA04FA008.md): Bell 47G-2A-1 · Balm, FL · Accident · 2 fatal · Field investigation · Final report · Oct 21, 2003 · N73979 · Destroyed
  > The pilot's intentional buzzing and his failure to maintain altitude/clearance which resulted in an in-flight collision with a building.
- [NTSB LAX03CA285](https://openairdocs.org/ntsb/LAX03CA285.md): Bell 47G-5 · Greenfield, CA · Accident · No injuries · Data collection · Final report · Sep 13, 2003 · N7060J · Substantial damage
  > the pilot's failure to maintain clearance with the wires due to an inadequate visual lookout.
- [NTSB CHI03FA277](https://openairdocs.org/ntsb/CHI03FA277.md): Bell TH-13T · Light, AR · Accident · Serious injuries · Field investigation · Final report · Aug 21, 2003 · N38CD · Substantial damage
  > The total failure and seizure of the main rotor transmission while in cruise flight leading to the helicopter’s impact with terrain.
- [NTSB NYC03CA170](https://openairdocs.org/ntsb/NYC03CA170.md): Bell 47G-2A · Jackson, NJ · Accident · No injuries · Data collection · Final report · Jul 30, 2003 · N7796C · Substantial damage
  > Pilot's inadequate preflight inspection and failure to remove a pesticide spraying hose from the helicopter prior to takeoff, which resulted in a loss of control.
- [NTSB LAX03LA236](https://openairdocs.org/ntsb/LAX03LA236.md): Bell 47G-2A · Porterville, CA · Accident · No injuries · Limited investigation · Final report · Jul 20, 2003 · N4774S · Substantial damage
  > Fatigue-induced failure of bolts in the helicopter's rotor drive flange, which resulted in a total loss of torque to the rotor drive shaft.
- [NTSB CHI03LA210](https://openairdocs.org/ntsb/CHI03LA210.md): Bell 47G-5 · Cleveland, MN · Accident · Serious injuries · Limited investigation · Final report · Jul 15, 2003 · N7925J · Destroyed
  > The pilot's inadequate visual lookout and low altitude flight when he failed to maintain altitude/clearance from the transmission wire. A factor contributing to the accident was the transmission wire.
- [NTSB CHI03LA204](https://openairdocs.org/ntsb/CHI03LA204.md): Continental Copters MK6B · Ft. Yates, ND · Accident · No injuries · Limited investigation · Final report · Jul 9, 2003 · N9080T · Substantial damage
  > The inadvertent settling with power and unsuccessful remedial action by the pilot. A factor to the accident was the potato crop.
- [NTSB CHI03LA184](https://openairdocs.org/ntsb/CHI03LA184.md): Bell 47G-5A · Sandusky, MI · Accident · No injuries · Limited investigation · Final report · Jun 28, 2003 · N8413D · Substantial damage
  > The failure of the ignition switch leading to an engine power loss in cruise flight and the subsequent high flare during autorotation. Factors contributing to the accident were the pilot's misjudgment of the landing flare and the unsuitable terrain…
- [NTSB ATL03LA007](https://openairdocs.org/ntsb/ATL03LA007.md): Bell 47G3B1 · Highfalls, GA · Accident · No injuries · Limited investigation · Final report · Oct 19, 2002 · N4002G · Substantial damage
  > The pilots inadequate fuel management, and subsequent loss of engine power due to fuel exhaustion, and a in-flight collision with trees during an autorotation. A factor was the pilot's failure to insure that the required equipment (fuel gauge) was installed…
- [NTSB FTW02LA264](https://openairdocs.org/ntsb/FTW02LA264.md): Bell 47G-2 · Edmondson, AR · Accident · 1 fatal · Limited investigation · Final report · Sep 25, 2002 · N5193B · Destroyed
  > The pilot's failure to maintain clearance from the high voltage power lines.
- [NTSB LAX02LA262](https://openairdocs.org/ntsb/LAX02LA262.md): Bell 47G-2 · Oasis, CA · Accident · Serious injuries · Limited investigation · Final report · Aug 25, 2002 · N8478H · Substantial damage
  > the pilot's failure to maintain an adequate visual lookout and clearance with power lines while maneuvering during an aerial application flight.
- [NTSB FTW02LA216](https://openairdocs.org/ntsb/FTW02LA216.md): Bell TH-13T · New Iberia, LA · Accident · No injuries · Limited investigation · Final report · Jul 18, 2002 · N99628 · Substantial damage
  > The loss of engine power for undetermined reasons. High vegetation was a factor.
- [NTSB LAX02LA218](https://openairdocs.org/ntsb/LAX02LA218.md): Bell 47G-2 · Compton, CA · Accident · No injuries · Limited investigation · Final report · Jul 7, 2002 · N2483B · Substantial damage
  > the failure and separation of a fan belt for the engine cooling system. A factor in the accident was the inadequate annual inspection 14 hours prior to the accident.
- [NTSB CHI02LA163](https://openairdocs.org/ntsb/CHI02LA163.md): Bell 47G-2A-1 · Jordan, MN · Accident · Minor injuries · Limited investigation · Final report · Jun 11, 2002 · N8542D · Substantial damage
  > The loss of engine power due to improper maintenance by unknown maintenance personnel which led to a misalignment of the gearbox casing.
- [NTSB MIA02LA101](https://openairdocs.org/ntsb/MIA02LA101.md): Bell 47G-2 · Bunnell, FL · Accident · No injuries · Limited investigation · Final report · May 28, 2002 · N6746D · Substantial damage
  > The failure of the student pilot to secure the rotorcraft floorboard mounted ballast, resulting in shifting of the ballast on liftoff, and the subsequent dynamic rollover.
- [NTSB ATL02LA094](https://openairdocs.org/ntsb/ATL02LA094.md): Bell 47G-5A · La Belle, FL · Accident · No injuries · Limited investigation · Final report · Apr 26, 2002 · N14838 · Substantial damage
  > The pilot's failure to maintain clearance of a tree while maneuvering, which resulted in an in-flight collision with the tree and subsequent uncontrolled descent and collision with terrain.
- [NTSB MIA02FA045](https://openairdocs.org/ntsb/MIA02FA045.md): Piper PA-32-260 · Jacksonville, FL · Accident · 4 fatal · Field investigation · Final report · Dec 13, 2001 · N7701J · Destroyed
  > The pilot becoming spatially disoriented and losing control of the airplane during a missed approach resulting in the airplane descending uncontrolled and colliding with trees and the ground.
- [NTSB FTW01LA202](https://openairdocs.org/ntsb/FTW01LA202.md): Hiller UH-12D · Lubbock, TX · Accident · Minor injuries · Limited investigation · Final report · Sep 3, 2001 · N2770 · Substantial damage
  > the failure of the tail rotor drive shaft hanger bearing, which resulted in the separation of the tail rotor drive shaft. A contributing factor was the lack of suitable terrain for the forced landing.
- [NTSB CHI01LA259](https://openairdocs.org/ntsb/CHI01LA259.md): Bell 47G-2 · Blooming Prairi, MN · Accident · No injuries · Limited investigation · Final report · Aug 5, 2001 · N440TG · Substantial damage
  > The reported loss of engine power for undetermined reasons during a the cruise portion of a CFR part 137 observation, and the pilot not following the height/velocity charts data.
- [NTSB ATL01LA075](https://openairdocs.org/ntsb/ATL01LA075.md): Bell 47 · Indianola, MS · Accident · No injuries · Limited investigation · Final report · Jul 10, 2001 · N8478D · Substantial damage
  > The pilot's improper use of flight controls during an autorotation that resulted inn the collapse of the skids and cross tube assembly. A factor was the loss of engine power due to the failure of # 1 connecting rod and the overload failure of the skids and…
- [NTSB NYC01LA130](https://openairdocs.org/ntsb/NYC01LA130.md): Continental Copters Tom Cat Mark 5A · Benton, PA · Accident · No injuries · Limited investigation · Final report · May 29, 2001 · N25561 · Substantial damage
  > The pilot's inadequate preflight inspection, which resulted in a takeoff with a hose still attached and a subsequent dynamic rollover.
- [NTSB CHI00TA306](https://openairdocs.org/ntsb/CHI00TA306.md): Bell 47G-5A · Economy, IN · Accident · Minor injuries · Final report · Sep 22, 2000 · N14841 · Substantial damage
  > The pilot failed to maintain control of the helicopter while attempting a landing on unsuitable terrain. A factor associated with the accident was the grass covered, down slope in the terrain.
- [NTSB LAX00LA280](https://openairdocs.org/ntsb/LAX00LA280.md): Bell 47G-5 · King City, CA · Accident · No injuries · Limited investigation · Final report · Jul 28, 2000 · N7885S · Substantial damage
  > The pilot's intentional flight into adverse weather which resulted in loss of visual reference and flight into power transmission wires and terrain.
- [NTSB CHI00LA204](https://openairdocs.org/ntsb/CHI00LA204.md): Bell 47G-3B-1 · Holstein, NE · Accident · Minor injuries · Limited investigation · Final report · Jul 16, 2000 · N83701 · Substantial damage
  > the settling with power encountered by the pilot. A factor was the sudden windshift.
- [NTSB MIA00LA176](https://openairdocs.org/ntsb/MIA00LA176.md): Bell 47G-2 · Fort Walton Bch, FL · Accident · No injuries · Limited investigation · Final report · May 27, 2000 · N96MB · Substantial damage
  > The unsuitable terrain encountered by the pilot-in-command during the forced landing and the loss of engine power for undetermined reasons.
- [NTSB LAX00LA124](https://openairdocs.org/ntsb/LAX00LA124.md): Bell 47G · Vacaville, CA · Accident · Minor injuries · Limited investigation · Final report · Mar 12, 2000 · N9763Z · Substantial damage
  > Failure of the pilot to see wires and maintain clearance while flying at a low altitude.
- [NTSB LAX00LA100](https://openairdocs.org/ntsb/LAX00LA100.md): Bell 47G5 · Riverbank, CA · Accident · No injuries · Limited investigation · Final report · Feb 16, 2000 · N4754R · Substantial damage
  > the pilot's failure to verify that ground personnel had disconnected the loading hose from the hopper before takeoff, resulting in restricted directional control and a hard landing.
- [NTSB ATL99FA132](https://openairdocs.org/ntsb/ATL99FA132.md): Continental Copters Tomcat MK5A · Heflin, AL · Accident · 2 fatal · Field investigation · Final report · Sep 16, 1999 · N9010T · 2 aircraft · Destroyed
  > The pilot of N9010T's failure to maintain visual lookout while maneuvering, resulting in a midair collision with N30899. A factor was the sun glare.
- [NTSB SEA99LA149](https://openairdocs.org/ntsb/SEA99LA149.md): Bell 47G-2 · Benton City, WA · Accident · 1 fatal · Limited investigation · Final report · Aug 26, 1999 · N11VH · Destroyed
  > A loss of power for undetermined reasons and the failure of the pilot to maintain adequate rotor RPM following the power loss. Contributing factors were the pilot's lack of certification and total experience.
- [NTSB FTW99TA194](https://openairdocs.org/ntsb/FTW99TA194.md): Bell 47G-3B-1 · Sour Lake, TX · Accident · No injuries · Final report · Jul 17, 1999 · N4002G · Substantial damage
  > The pilot's failure to adequately preflight the helicopter's fuel system resulting in the total loss of engine power as a result of water contamination. Factors were the incorrect filter installed on the fueling truck and the pilot's improper touchdown…
- [NTSB ATL99LA107](https://openairdocs.org/ntsb/ATL99LA107.md): Continental Copters Tomcat MK5A · Camden, AL · Accident · Minor injuries · Limited investigation · Final report · Jul 14, 1999 · N9086T · Substantial damage
  > The failure of the cyclic control rod due to an overstress separation resulting from a material defect (inadequate quality of material) by the manufacturer.
- [NTSB LAX99LA081](https://openairdocs.org/ntsb/LAX99LA081.md): Hiller UH-12E · Lemoore, CA · Accident · No injuries · Limited investigation · Final report · Jan 24, 1999 · N67064 · Substantial damage
  > The inadequate nature of the operator's maintenance, which failed to detect the primer and magneto discrepancies. An overly lean fuel mixture and/or magneto cross firing resulted in detonation, an ensuing connecting rod failure, and a total loss of engine…
- [NTSB IAD99LA024](https://openairdocs.org/ntsb/IAD99LA024.md): Bell 47-G5 · Essex Junction, VT · Accident · Serious injuries · Limited investigation · Final report · Dec 14, 1998 · N8103J · Substantial damage
  > the pilot's improper entry into the autorotation, which resulted in the loss of power and a low rotor rpm condition. Also causal was the pilot's improper execution of the autorotation which resulted in the hard landing. Factors in the accident were the…

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

This list as a web page: https://openairdocs.org/ntsb?engine=41525&page=2

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