# NTSB investigations: Bell 47D1

A list on [Bell 47D1](https://openairdocs.org/model/bell-47d1.md).

Matched to the registry by N-number and event date, newest first.

Page 1 of 5 · 223 investigations

- [NTSB ERA22LA039](https://openairdocs.org/ntsb/ERA22LA039.md): Bell 47D1 · Zelienople, PA · Accident · No injuries · Class 3 · Limited · Final report · Oct 31, 2021 · N132BR · Substantial damage
  > A total loss of engine power for reasons that could not be determined.
- [NTSB WPR21LA077](https://openairdocs.org/ntsb/WPR21LA077.md): Bell 47D · Marana, AZ · Accident · Minor injuries · Class 4 · Limited · Final report · Jan 1, 2021 · N74823 · Substantial damage
  > The pilot's failure to maintain helicopter control, which resulted in a hard landing.
- [NTSB CEN17LA264](https://openairdocs.org/ntsb/CEN17LA264.md): Bell 47D1 · Big Lake, MN · Accident · No injuries · Limited investigation · Final report · Jul 6, 2017 · N153B · Substantial damage
  > The failure of the metal core assembly within a wooden main rotor blade due to undetected corrosion and fatigue, which caused the wooden blade to separate from the rotor mast.
- [NTSB ERA16LA167](https://openairdocs.org/ntsb/ERA16LA167.md): Bell 47D1 · Myerstown, PA · Accident · No injuries · Limited investigation · Final report · Apr 20, 2016 · N202CH · Substantial damage
  > A total loss of engine power for reasons that could not be determined because examination of the engine revealed no mechanical anomalies that would have precluded normal operation.
- [NTSB GAA15CA221](https://openairdocs.org/ntsb/GAA15CA221.md): Bell 47D1 · Clanton, AL · Accident · No injuries · Data collection · Final report · Aug 11, 2015 · N74823 · Substantial damage
  > The student pilot's abrupt cyclic and collective inputs during the approach to land which resulted in abnormal runway contact and a subsequent tail boom strike by the main rotor blades.
- [NTSB ERA14LA099](https://openairdocs.org/ntsb/ERA14LA099.md): Bell 47D1 · Pell City, AL · Accident · Minor injuries · Limited investigation · Final report · Jan 21, 2014 · N93067 · Substantial damage
  > The pilot’s use of an improper clutch engagement procedure, which resulted in clutch glazing, slippage, and, ultimately, the in-flight disengagement of the clutch and a loss of rotor rpm. Contributing to the accident were the installation of a light-weight…
- [NTSB CEN13LA396](https://openairdocs.org/ntsb/CEN13LA396.md): Bell 47D1 · Lake Ozark, MO · Accident · No injuries · Limited investigation · Final report · Jun 28, 2013 · N78900 · Substantial damage
  > The improper rebuild and maintenance of the helicopter and inadequate subsequent inspections, which resulted in undetected fuel contamination and a subsequent total loss of engine power during cruise flight.
- [NTSB WPR12LA029](https://openairdocs.org/ntsb/WPR12LA029.md): Bell 47D1 · San Diego, CA · Accident · No injuries · Limited investigation · Final report · Nov 8, 2011 · N4251A · Substantial damage
  > The flight instructor's inadequate supervision of the student pilot during a simulated autorotation and the pilots’ failure to use carburetor heat while operating at reduced engine power while in carburetor icing conditions, which resulted in a loss of engine…
- [NTSB WPR11LA469](https://openairdocs.org/ntsb/WPR11LA469.md): Bell 47D1 · Ahwahnee, CA · Accident · Serious injuries · Limited investigation · Final report · Sep 27, 2011 · N9158R · Substantial damage
  > The pilot’s failure to maintain adequate main rotor rpm during the landing approach, which resulted in a loss of control.
- [NTSB ERA10CA001](https://openairdocs.org/ntsb/ERA10CA001.md): Bell 47D1 · Dorrance, PA · Accident · No injuries · Data collection · Final report · Oct 2, 2009 · N74004 · Substantial damage
  > A total loss of engine power due to fuel exhaustion for undetermined reasons.
- [NTSB CHI08LA151](https://openairdocs.org/ntsb/CHI08LA151.md): Bell 47D1 · Carrollton, OH · Accident · No injuries · Limited investigation · Final report · Jun 1, 2008 · N74898 · Substantial damage
  > The airframe vibration for an undetermined reason.
- [NTSB LAX06LA030](https://openairdocs.org/ntsb/LAX06LA030.md): Bell 47D1 · Rancho Murieta, CA · Accident · Serious injuries · Limited investigation · Final report · Nov 10, 2005 · N16356 · Substantial damage
  > a separation of the tail rotor assembly due to the reverse bending fatigue fracture of a tail rotor pitch change link bolt, resulting in a loss of control of the helicopter, and a hard landing during the uncontrolled descent.
- [NTSB LAX05LA022](https://openairdocs.org/ntsb/LAX05LA022.md): Bell 47D1 · San Martin, CA · Accident · No injuries · Limited investigation · Final report · Oct 31, 2004 · N903B · Substantial damage
  > A loss of power for undetermined reasons.
- [NTSB NYC03LA069](https://openairdocs.org/ntsb/NYC03LA069.md): Bell 47D · Princetown, NY · Accident · Minor injuries · Limited investigation · Final report · Mar 23, 2003 · N74120 · Substantial damage
  > The student's failure to maintain control while executing a takeoff to a hover, and the flight instructor's delayed remedial action. A factor in the accident was the muddy ground.
- [NTSB MIA02LA154](https://openairdocs.org/ntsb/MIA02LA154.md): Bell 47-D1 · Union, SC · Accident · Minor injuries · Limited investigation · Final report · Aug 20, 2002 · N4702S · Substantial damage
  > the pilot's failure to maintain obstacle clearance.
- [NTSB FTW02LA044](https://openairdocs.org/ntsb/FTW02LA044.md): Bell 47G · Ardmore, OK · Accident · No injuries · Limited investigation · Final report · Dec 1, 2001 · N5226 · Substantial damage
  > the flight instructor's selection of an unsuitable area for practicing a full touchdown autorotation, which resulted in a nose over. A contributing factor was the soft ground.
- [NTSB MIA98LA254](https://openairdocs.org/ntsb/MIA98LA254.md): Bell 47-D1 · Oxford, MS · Accident · Minor injuries · Limited investigation · Final report · Sep 29, 1998 · N755E · Substantial damage
  > The pilot's failure to maintain directional control due to vibration from the main rotor blade for undetermined reasons. A related finding was the improper repair of a crack in the laminant of the blue main rotor blade by other maintenance personnel.
- [NTSB MIA98LA230](https://openairdocs.org/ntsb/MIA98LA230.md): Bell 47D1 · Dawson, GA · Accident · No injuries · Limited investigation · Final report · Aug 29, 1998 · N4702S · Substantial damage
  > The pilot's selection of unsuitable terrain for landing resulting in debris being blown up during landing resulting in damage to the tail rotor and loss of control.
- [NTSB FTW98LA144](https://openairdocs.org/ntsb/FTW98LA144.md): Bell 47D1 · Jeanerette, LA · Accident · Minor injuries · Limited investigation · Final report · Mar 11, 1998 · N13012 · Substantial damage
  > The in-flight disconnect of the rotating scissors due to the separation of its hinge bolt.
- [NTSB MIA98LA051](https://openairdocs.org/ntsb/MIA98LA051.md): Bell 47D1 · Bunnell, FL · Accident · No injuries · Limited investigation · Final report · Jan 3, 1998 · N59326 · Substantial damage
  > the student pilot's improper planning/decision, which resulted in fuel exhaustion, loss of engine power, and a forced landing.
- [NTSB ATL97LA121](https://openairdocs.org/ntsb/ATL97LA121.md): Bell 47-D1 · Holcomb, MS · Accident · No injuries · Limited investigation · Final report · Aug 11, 1997 · N908B · Substantial damage
  > The failure of the pilot to adequately see and avoid all obstructions while doing aerial application work.
- [NTSB FTW96LA192](https://openairdocs.org/ntsb/FTW96LA192.md): Bell 47D1 · Ardmore, OK · Accident · No injuries · Limited investigation · Final report · Apr 26, 1996 · N5226 · Substantial damage
  > the student's inadvertent dynamic rollover, and inadequate supervision by the flight instructor.
- [NTSB MIA96LA028](https://openairdocs.org/ntsb/MIA96LA028.md): Bell 47-D1 · Jasper, FL · Accident · No injuries · Limited investigation · Final report · Nov 15, 1995 · N4702S · Substantial damage
  > Improper maintenance and inspection of the carburetor system by maintenance personnel during the last annual inspection which resulted in a partial loss of engine power due to carburetor ice. Contributing to the accident were: the pilot's failure to perform…
- [NTSB LAX96FA045](https://openairdocs.org/ntsb/LAX96FA045.md): Bell 47D1 · Shafter, CA · Accident · 2 fatal · Field investigation · Final report · Nov 12, 1995 · N78900 · Destroyed
  > the pilot misjudged the altitude and ground clearance while performing an unwarranted low altitude flight maneuver.
- [NTSB BFO95LA084](https://openairdocs.org/ntsb/BFO95LA084.md): Bell 47D1 · Sidney, OH · Accident · No injuries · Limited investigation · Final report · Aug 22, 1995 · N9115R · Substantial damage
  > the student pilot's abrupt touchdown while landing in a field. Related factors are the student pilot's failure to attain the proper descent rate during the approach to landing, and the flight instructor's inadequate supervision of the student.
- [NTSB FTW95FA181](https://openairdocs.org/ntsb/FTW95FA181.md): Bell 47D1 · Ardmore, OK · Accident · 2 fatal · Field investigation · Final report · Apr 25, 1995 · N2202C · Destroyed
  > Inflight collision with a power transmission array static line when the flight instructor and dual (private pilot) student failed to maintain adequate visual lookout.
- [NTSB ATL94LA172](https://openairdocs.org/ntsb/ATL94LA172.md): Bell 47D1 Wasp · Hazel Green, AL · Accident · No injuries · Limited investigation · Final report · Sep 13, 1994 · N908B · Substantial damage
  > Undetermined.
- [NTSB LAX94LA235](https://openairdocs.org/ntsb/LAX94LA235.md): Bell 47D-1 · Chino, CA · Accident · No injuries · Limited investigation · Final report · Jun 2, 1994 · N14412 · Substantial damage
  > loss of aircraft control due to the pilot's failure to correctly configure the hydraulic system prior to takeoff.
- [NTSB MIA94FA125](https://openairdocs.org/ntsb/MIA94FA125.md): Bell 47D1 · Marathon, FL · Accident · 2 fatal · Field investigation · Final report · Apr 22, 1994 · N9660 · Destroyed
  > Separation of the tail rotor gearbox and tail rotor blades for an undetermined reason. Factors related to the accident were: failure of maintenance personnel to follow the proper maintenance procedure after a previous tail rotor strike, and failure to conduct…
- [NTSB LAX93LA010](https://openairdocs.org/ntsb/LAX93LA010.md): Bell 47-D1 · El Monte, CA · Accident · No injuries · Limited investigation · Final report · Oct 11, 1992 · N162B · Substantial damage
  > The pilot's failure to maintain the rotor RPM.
- [NTSB ATL92LA131](https://openairdocs.org/ntsb/ATL92LA131.md): Bell 47D1 · Centre, AL · Accident · No injuries · Limited investigation · Final report · Jun 25, 1992 · N68632 · Substantial damage
  > The pilot's inadequate visual lookout, resulting in a collision with a wire.
- [NTSB MIA92LA102](https://openairdocs.org/ntsb/MIA92LA102.md): Bell 47-D-1 · Fayette, MS · Accident · Minor injuries · Limited investigation · Final report · Apr 2, 1992 · N322A · Substantial damage
  > The pilot in commands failure to insure the proper fuel quantity for the flight was placed on the aircraft and his failure to monitor fuel quantity during flight resulting in fuel exhaustion.
- [NTSB MIA92LA069](https://openairdocs.org/ntsb/MIA92LA069.md): Bell 47D1 · Cross City, FL · Accident · No injuries · Limited investigation · Final report · Jan 27, 1992 · N93067 · Substantial damage
  > Partial loss of engine power due to undetermined reasons and unsuitable terrain encountered during the autorotative landing.
- [NTSB ATL92LA017](https://openairdocs.org/ntsb/ATL92LA017.md): Bell 47D-1 · Rome, GA · Accident · No injuries · Limited investigation · Final report · Oct 28, 1991 · N925V · Substantial damage
  > The failure of a tail rotor blade for undetermined reasons.
- [NTSB FTW91LA126](https://openairdocs.org/ntsb/FTW91LA126.md): Bell 47D-1 · Provencal, LA · Accident · No injuries · Limited investigation · Final report · Jul 24, 1991 · N3575 · Substantial damage
  > Fuel leakage from the fuel drain valve. A factor was the inaccessibility of suitable terrain for fored landing.
- [NTSB FTW91LA091](https://openairdocs.org/ntsb/FTW91LA091.md): Bell 47D-1 · Peach Orchard, AR · Accident · No injuries · Limited investigation · Final report · Jun 5, 1991 · N8117 · Substantial damage
  > The pilot's failure to maintain adequate main rotor RPM resulting in deteriorated helicopter performance. A factor was the tailwind condition.
- [NTSB FTW91DRD05](https://openairdocs.org/ntsb/FTW91DRD05.md): Bell 47-D1 · Sun, LA · Accident · No injuries · Final report · May 26, 1991 · N339MC · Substantial damage
  > The total loss of power for undetermined reasons and the failure of the pilot to maintain rotor RPM. A factor was the lack of suitable terrain.
- [NTSB CHI90DEC04](https://openairdocs.org/ntsb/CHI90DEC04.md): Bell 47 D-1 · Stockbridge, MI · Accident · Serious injuries · Final report · Aug 14, 1990 · N3656F · Destroyed
  > The restricted visual lookout which resulted from the canopy fogging up.
- [NTSB MKC90LA144](https://openairdocs.org/ntsb/MKC90LA144.md): Bell 47D-1 · Fair Oaks, AR · Accident · Minor injuries · Limited investigation · Final report · Jul 12, 1990 · N8117 · Substantial damage
  > Tail rotor cable disengagement due to inadequate maintenance.
- [NTSB NYC90DGM02](https://openairdocs.org/ntsb/NYC90DGM02.md): Bell 47D1 · Meadville, PA · Accident · 1 fatal · Final report · Jun 22, 1990 · N310A · Destroyed
  > The pilot's failure to see and avoid the power lines.
- [NTSB BFO90LA042](https://openairdocs.org/ntsb/BFO90LA042.md): Bell 47D · Baltimore, MD · Accident · No injuries · Limited investigation · Final report · May 13, 1990 · N4229A · Substantial damage
  > The pilot applied excessive cyclic control, causing the main rotor to flex and severe the tail cone.
- [NTSB ATL90DLQ01](https://openairdocs.org/ntsb/ATL90DLQ01.md): Bell 47D1 · Hickman, KY · Accident · No injuries · Final report · Apr 24, 1990 · N2134 · Substantial damage
  > Improper in-flight planning/decision by the pilot. The resultant tailwind was a related factor.
- [NTSB MIA90LA096](https://openairdocs.org/ntsb/MIA90LA096.md): Bell 47D1 · Rockledge, FL · Accident · No injuries · Limited investigation · Final report · Mar 25, 1990 · N10326 · Substantial damage
  > Failure of a connecting rod.
- [NTSB FTW90LA041](https://openairdocs.org/ntsb/FTW90LA041.md): Bell 47D1 · Ardmore, OK · Accident · Serious injuries · Limited investigation · Final report · Dec 4, 1989 · N2202C · Substantial damage
  > Pilot's inadequate compensation for existing wind conditions. Contributing to the accident were the gusty tail winds.
- [NTSB MIA90LA023](https://openairdocs.org/ntsb/MIA90LA023.md): Bell 47D1 · Loxahatchee, FL · Accident · Serious injuries · Limited investigation · Final report · Nov 2, 1989 · N93067 · Substantial damage
  > Failure of the pilot to maintain rotor RPM after pulling up from a swath run. A related factor was the presence of trees.
- [NTSB FTW89LA104](https://openairdocs.org/ntsb/FTW89LA104.md): Bell 47D-1 · Ardmore, OK · Accident · No injuries · Limited investigation · Final report · May 26, 1989 · N2202C · Substantial damage
  > The flight instructor failed to recognize that the aircraft was developing a dangerous sink rate during the autorotation and take corrective action by executing a power recovery. Contributing to the accident were the gusty wind conditions.
- [NTSB ATL89DLT03](https://openairdocs.org/ntsb/ATL89DLT03.md): Bell 47 · Shelbyville, TN · Accident · No injuries · Final report · May 12, 1989 · N908B · Substantial damage
  > Failure in the rotor drive system for unknown reasons. Contributing to the accident was the pilot's inability to perform an autorotation.
- [NTSB MIA89LA133](https://openairdocs.org/ntsb/MIA89LA133.md): Bell 47D1 · Miami, FL · Accident · Serious injuries · Limited investigation · Final report · Apr 17, 1989 · N342L · Substantial damage
  > The unqualified persons failure to maintain clearance from the fence. Pressure induced by others, lack of experience, and over confidence in personal ability are contributing factors to this accident.
- [NTSB NYC89DNE01](https://openairdocs.org/ntsb/NYC89DNE01.md): Bell 47D1 · Russell, MA · Accident · 1 fatal · Final report · Dec 2, 1988 · N163B · Destroyed
  > A pilot induced low rotor RPM condition, followed by blade flapping as the main rotor blade contacted the tail of the helicopter.
- [NTSB FTW89DPA03](https://openairdocs.org/ntsb/FTW89DPA03.md): Bell 47-D1 · Allen, TX · Accident · Serious injuries · Final report · Dec 2, 1988 · N74124 · Substantial damage
  > Unqualified pilot's poor judgement in leveling the helicopter during the flare and contributing to this was his lack of total experience in this type aircraft.

Next page: https://openairdocs.org/model/bell-47d1/ntsb.md?page=2

## 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_aircrafts.parquet' a JOIN 'https://openairdocs.org/data/latest/ntsb_case_detail.parquet' c ON c."mKey" = a.case_mkey
WHERE a.aircraft_model_code IN ('1180802')
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/model/bell-47d1/ntsb

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