# NTSB investigations: Allison 250-C20 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 · 372 cases

## Cases, newest first

- [NTSB ERA09LA047](https://openairdocs.org/ntsb/ERA09LA047.md): Bell 206B · Boynton Beach, FL · Accident · Minor injuries · Limited investigation · Final report · Nov 11, 2008 · N281CB · Substantial damage
  > A loss of engine power due to an undertorqued air line fitting to the fuel control.
- [NTSB ERA09IA499](https://openairdocs.org/ntsb/ERA09IA499.md): Mcdonnell Douglas Helicopter 369E · Allentown, PA · Incident · No injuries · Incident investigation · Final report · Sep 29, 2008 · N801SB · Minor damage
  > The fatigue failure of a blade in the second-stage turbine wheel, which resulted in a total loss of engine power.
- [NTSB SEA08LA213](https://openairdocs.org/ntsb/SEA08LA213.md): Bell 206B · Woods Landing-Jelm, WY · Accident · Serious injuries · Limited investigation · Final report · Sep 27, 2008 · N59611 · Substantial damage
  > The pilot's encounter with a loss of tail rotor effectiveness event and his failure to maintain directional control while maneuvering. Contributing to the accident were the tailwind condition and the sloping, uneven terrain.
- [NTSB NYC08CA309](https://openairdocs.org/ntsb/NYC08CA309.md): Bell 206B · Eutaw, AL · Accident · No injuries · Data collection · Final report · Sep 9, 2008 · N206WA · Substantial damage
  > The pilot's inadequate preflight inspection.
- [NTSB SEA08FA071](https://openairdocs.org/ntsb/SEA08FA071.md): Mcdonnell Douglas 369E · Hilo, HI · Accident · Minor injuries · Field investigation · Final report · Feb 8, 2008 · N698DM · Substantial damage
  > A leak in the fuel filter pressure differential switch that resulted in a loss of engine power. Contributing to the accident was uneven terrain that hindered a successful emergency landing.
- [NTSB CHI08CA021](https://openairdocs.org/ntsb/CHI08CA021.md): Bell 206B-III · Medora, ND · Accident · Minor injuries · Data collection · Final report · Oct 18, 2007 · N51698 · Substantial damage
  > The pilot failed to maintain clearance from the fence while maneuvering at a low altitude, which resuled in the helicopter rolling over and impacting the terrain. A factor associated with the accident was the fence.
- [NTSB SEA07CA256](https://openairdocs.org/ntsb/SEA07CA256.md): Rogerson Hiller RH-1100 · Stanwood, WA · Accident · Minor injuries · Data collection · Final report · Sep 11, 2007 · N6014U · Destroyed
  > The pilot's failure to execute a go-around and his failure to reduce his groundspeed to zero prior to touching down on the rough/uneven terrain. Factors include the momentary restriction of a flight control, rough/uneven terrain, and a tailwind.
- [NTSB LAX07LA270](https://openairdocs.org/ntsb/LAX07LA270.md): Hughes 369D · Ellensburg, WA · Accident · 1 fatal · Limited investigation · Final report · Sep 8, 2007 · N31HM · No damage
  > The passenger's inadequate visual lookout and failure to maintain clearance from the rotating main rotor disc while the helicopter was hovering. An uphill terrain condition was a factor
- [NTSB NYC07LA188](https://openairdocs.org/ntsb/NYC07LA188.md): Bell 206B · Warrenton, VA · Accident · No injuries · Limited investigation · Final report · Aug 7, 2007 · N3202D · Substantial damage
  > The flight instructor's failure to maintain adequate rotor rpm during touchdown.
- [NTSB DEN07LA132](https://openairdocs.org/ntsb/DEN07LA132.md): Bell 206B · Broomfield, CO · Accident · Minor injuries · Limited investigation · Final report · Aug 1, 2007 · N568TD · Substantial damage
  > The pilot's failure to maintain control of the helicopter, resulting in an inadvertent dynamic rollover.
- [NTSB CHI07CA244](https://openairdocs.org/ntsb/CHI07CA244.md): Bell 206B · Columbia, MO · Accident · Minor injuries · Data collection · Final report · Jul 31, 2007 · N9ZV · Substantial damage
  > The pilot's failure to maintain control of the helicopter, which resulted in impact with terrain during takeoff. A factor in the accident was the tall grass.
- [NTSB SEA07CA200](https://openairdocs.org/ntsb/SEA07CA200.md): Bell 206B II · Sheep Mountain, MT · Accident · Minor injuries · Data collection · Final report · Jul 16, 2007 · N164JS · Substantial damage
  > The external load net, attached directly to the cargo hook without the use of a long line, oscillated and made contact with the tail rotor system while maneuvering.
- [NTSB CHI07LA193](https://openairdocs.org/ntsb/CHI07LA193.md): Hughes 369D · Comfrey, MN · Accident · No injuries · Limited investigation · Final report · Jul 5, 2007 · N500NC · Substantial damage
  > The loss of engine power due to the loose pressure line during aerial application maneuvers which resulted in a hard forced landing.
- [NTSB ATL07GA087](https://openairdocs.org/ntsb/ATL07GA087.md): Bell 206B · Cedartown, GA · Accident · Serious injuries · Final report · Jun 5, 2007 · N912SP · Substantial damage
  > The pilot's failure to maintain control of the helicopter while maneuvering. Contributing to the accident were strong gusty winds.
- [NTSB SEA07CA139](https://openairdocs.org/ntsb/SEA07CA139.md): Hughes 369D · Torrance, CA · Accident · No injuries · Data collection · Final report · May 29, 2007 · N935M · Substantial damage
  > The pilot's loss of helicopter control while maneuvering at low altitude, which resulted in a hard landing. The wind gusts were a contributing factor.
- [NTSB NYC07LA149](https://openairdocs.org/ntsb/NYC07LA149.md): Messerschmitt BO-105 · Isla de Vieques, PR · Accident · No injuries · Limited investigation · Final report · May 28, 2007 · N911GB · Substantial damage
  > The mechanic's failure to secure the engine governor locking hardware, which resulted in the right engine losing power.
- [NTSB LAX07CA177](https://openairdocs.org/ntsb/LAX07CA177.md): MD Helicopters 500-E · Yerington, NV · Accident · Minor injuries · Data collection · Final report · May 27, 2007 · N526BH · Substantial damage
  > The failure of the student and instructor to maintain an adequate main rotor rpm, and the instructor’s inadequate in-flight supervision while conducting a low-level simulated emergency procedure, which resulted in a hard landing.
- [NTSB MIA07FA098](https://openairdocs.org/ntsb/MIA07FA098.md): Hughes 369A · Moulton, AL · Accident · 1 fatal · Field investigation · Final report · May 13, 2007 · N468WE · Destroyed
  > The separation of a main rotor blade from its tension torsion bar for an undetermined reason.
- [NTSB DFW07LA109](https://openairdocs.org/ntsb/DFW07LA109.md): Bell 206B · E. Cameron 219 · Accident · Minor injuries · Limited investigation · Final report · May 11, 2007 · N3RL · Substantial damage
  > The pilot's failure to establish a climb and maintian directional control of the helicopter while departing the offshore platform.
- [NTSB SEA07LA108](https://openairdocs.org/ntsb/SEA07LA108.md): Hughes 369D · Kahuku, HI · Accident · Minor injuries · Limited investigation · Final report · Apr 20, 2007 · N911FT · Substantial damage
  > Fatigue cracking of the oil line from the engine gearbox to the oil pressure gauge, which resulted in loss of engine lubricating oil, leading to seizure of the power turbine.
- [NTSB NYC07CA084](https://openairdocs.org/ntsb/NYC07CA084.md): Bell 206B · Lewes, DE · Accident · Minor injuries · Data collection · Final report · Mar 23, 2007 · N828BA · Substantial damage
  > The pilot's inadequate visual lookout, which resulted in an in flight collision with utility wires during takeoff, and a subsequent impact with terrain.
- [NTSB SEA07CA069](https://openairdocs.org/ntsb/SEA07CA069.md): Bell 206 B3 · Custer, MT · Accident · No injuries · Data collection · Final report · Mar 5, 2007 · N150SP · Substantial damage
  > The pilot’s failure to maintain clearance between the tail rotor of his helicopter and a piece of farm equipment during the landing sequence.
- [NTSB ANC07LA022](https://openairdocs.org/ntsb/ANC07LA022.md): Hughes 369D · Gustavus, AK · Accident · No injuries · Limited investigation · Final report · Mar 3, 2007 · N5134V · Substantial damage
  > The inadequate clearance from a tranquilized moose while hovering in ground effect, and the operator's inadequate procedures for such operations, which resulted in an in-flight collision with the moose. Factors associated with the accident were the moose, a…
- [NTSB LAX07CA072](https://openairdocs.org/ntsb/LAX07CA072.md): Bell Helicopter 206BIII · Springville, CA · Accident · Minor injuries · Data collection · Final report · Jan 19, 2007 · N185BC · Substantial damage
  > The pilot's failure to maintain terrain/obstacle clearance while maneuvering. Factors were the mountainous terrain, trees, and low-altitude flight maneuvers.
- [NTSB LAX07CA034](https://openairdocs.org/ntsb/LAX07CA034.md): Bell 206B · Boulder City, NV · Accident · No injuries · Data collection · Final report · Nov 11, 2006 · N59571 · Substantial damage
  > the pilot's inadequate planning and decision in his failure to reduce the engine throttle to ground idle prior to exiting the helicopter.
- [NTSB LAX06LA288](https://openairdocs.org/ntsb/LAX06LA288.md): Hughes 369D · Somis, CA · Accident · 2 fatal · Limited investigation · Final report · Sep 6, 2006 · N812CE · Substantial damage
  > The pilot's inadequate visual lookout, which resulted in a collision with wires.
- [NTSB LAX06TA259](https://openairdocs.org/ntsb/LAX06TA259.md): Hughes 369D · Lahaina, HI · Accident · No injuries · Final report · Aug 13, 2006 · N114HD · Substantial damage
  > the pilot's failure to shut down the engine prior to exiting the helicopter resulting in the tail rotor contacting the ground. A contributing factor was the gusting wind conditions present at the accident site.
- [NTSB ANC06CA122](https://openairdocs.org/ntsb/ANC06CA122.md): Bell 206B · Orlando, FL · Accident · No injuries · Data collection · Final report · Aug 9, 2006 · N121RH · Substantial damage
  > The pilot's failure to refuel the helicopter prior to the accident flight, which resulted in a loss of engine power during cruise flight, and a hard landing.
- [NTSB NYC06TA190](https://openairdocs.org/ntsb/NYC06TA190.md): MD Helicopter 500N · Louisville, KY · Accident · Minor injuries · Final report · Aug 2, 2006 · N520AP · Substantial damage
  > The pilot's failure to maintain control of the helicopter and the flight instructor's inadequate supervision, which resulted in a hard landing and subsequent rollover.
- [NTSB SEA06LA135](https://openairdocs.org/ntsb/SEA06LA135.md): Hughes 369D · Moab, UT · Accident · No injuries · Limited investigation · Final report · Jun 30, 2006 · N369PB · Substantial damage
  > The failure of the collective bungee support bracket due to non-compliance with a service information notice, which resulted in the pilot executing a precautionary autorotative landing. A contributing factor was the lack of suitable terrain for the landing.
- [NTSB DEN06LA080](https://openairdocs.org/ntsb/DEN06LA080.md): Garlick Helicopters OH- 58C · Muddy Gap, WY · Accident · No injuries · Limited investigation · Final report · May 30, 2006 · N16JD · Substantial damage
  > the loss of engine power for reasons undetermined. Contributing to the accident was the low altitude and rough uneven terrain.
- [NTSB NYC06LA122](https://openairdocs.org/ntsb/NYC06LA122.md): Hughes 369HS · Mattituck, NY · Accident · Minor injuries · Limited investigation · Final report · May 28, 2006 · N9244F · Substantial damage
  > A loss of engine power due to undetermined reasons.
- [NTSB LAX06LA161](https://openairdocs.org/ntsb/LAX06LA161.md): Bell 206B3 · Fallbrook, CA · Accident · Minor injuries · Limited investigation · Final report · May 4, 2006 · N2763R · Substantial damage
  > Failure of the engine to transmission drive shaft forward coupling due to overheating from lack of lubrication. The cause of the lack of lubrication was a result of improper maintenance. A factor was the trees.
- [NTSB DFW06CA112](https://openairdocs.org/ntsb/DFW06CA112.md): Bell 206B · Vinita, OK · Accident · No injuries · Data collection · Final report · May 2, 2006 · N342WC · Substantial damage
  > The pilot's improper pre-flight planning, which resulted in a total loss of engine power due to fuel exhaustion. A contributing factor was the lack of suitable terrain for the forced landing.
- [NTSB SEA06TA071](https://openairdocs.org/ntsb/SEA06TA071.md): Bell 206B · Sprague, WA · Accident · No injuries · Final report · Apr 7, 2006 · N96NW · Substantial damage
  > The pilot's failure to maintain clearance from mountainous terrain while maneuvering. Mountainous terrain was a factor.
- [NTSB MIA06LA044](https://openairdocs.org/ntsb/MIA06LA044.md): MBB BO-105S · Ponce, PR · Accident · Minor injuries · Limited investigation · Final report · Jan 12, 2006 · N495LF · Substantial damage
  > A loose B-nut on the PC line connecting the power turbine governor (PTGOV) to the fuel control unit (FCU) that created a leak and caused the engine to roll back to an idle condition, causing a low hydraulic system pressure and subsequent control lock. A…
- [NTSB LAX06LA015](https://openairdocs.org/ntsb/LAX06LA015.md): Hughes 369D · Avalon, CA · Accident · Serious injuries · Limited investigation · Final report · Oct 19, 2005 · N268ST · Substantial damage
  > the pilot's failure to maintain an adequate visual lookout and obstacle clearance altitude, which resulted in a collision with power lines. Factors in the accident were the position of the sun relative to the helicopter's flight path, which lessoned the…
- [NTSB SEA05MA202](https://openairdocs.org/ntsb/SEA05MA202.md): Agusta A109A II · Edmonds, WA · Accident · 3 fatal · Major investigation · Final report · Sep 30, 2005 · N655GS · Destroyed
  > Loss of control for an undetermined reason during maneuvering flight, which resulted in an in-flight collision with water.
- [NTSB SEA05CA200](https://openairdocs.org/ntsb/SEA05CA200.md): McDonnell Douglas 369E · Medford, OR · Accident · Minor injuries · Data collection · Final report · Sep 24, 2005 · N5207C · Substantial damage
  > In-flight collision with terrain during a precautionary landing. Factors include instrument meteorological conditions and pilot disorientation.
- [NTSB CHI05CA271](https://openairdocs.org/ntsb/CHI05CA271.md): Bell 206B · Elk Point, SD · Accident · No injuries · Data collection · Final report · Sep 15, 2005 · N2995W · Substantial damage
  > The loss of directional control for undetermined reasons which led to the pilot not being able to maintain clearance from the embankment during the forced landing. The rising embankment was a factor.
- [NTSB DFW05LA239](https://openairdocs.org/ntsb/DFW05LA239.md): Bell 206B · New Orleans, LA · Accident · Minor injuries · Limited investigation · Final report · Sep 7, 2005 · N230CA · Substantial damage
  > The pilot's failure to maintain directional control after encountering a loss of tail rotor effectiveness. A contributing factor was the lack of suitable terrain.
- [NTSB LAX05LA289](https://openairdocs.org/ntsb/LAX05LA289.md): Bell 206B · Long Beach, CA · Accident · Serious injuries · Limited investigation · Final report · Sep 5, 2005 · N667JM · Substantial damage
  > the pilot's decision not to release the banner when it became entangled on itself, which resulted in the banner tow rope becoming ensnarled with the tail rotor system.
- [NTSB DFW05LA252](https://openairdocs.org/ntsb/DFW05LA252.md): Bell 206B · Myrtle Grove, LA · Accident · Minor injuries · Limited investigation · Final report · Sep 1, 2005 · N59539 · Substantial damage
  > The pilot's loss of control in flight for undetermined reasons.
- [NTSB DFW05CA172](https://openairdocs.org/ntsb/DFW05CA172.md): Garlick Helicopters OH-58A+ · Graham, TX · Accident · Serious injuries · Data collection · Final report · Jun 22, 2005 · N372NS · Substantial damage
  > The pilot's failure to maintain clearance with the wire while maneuvering during an aerial application flight. Low altitude flight is a contributing factor.
- [NTSB MIA05LA095](https://openairdocs.org/ntsb/MIA05LA095.md): Bell 206B · Coral Springs, FL · Accident · Serious injuries · Limited investigation · Final report · Apr 20, 2005 · N2285B · Substantial damage
  > The pilot encountered dynamic rollover while lifting off from an area in the everglades with 6-7 foot tall sawgrass nearby.
- [NTSB MIA05LA088](https://openairdocs.org/ntsb/MIA05LA088.md): Schweizer 269D · Atlantic Ocean (Atlantic Ocean) · Accident · 1 fatal · Limited investigation · Final report · Mar 29, 2005 · N4767 · Destroyed
  > An inflight collision with the ocean for undetermined reasons.
- [NTSB ANC05CA049](https://openairdocs.org/ntsb/ANC05CA049.md): Bell 206B · Elim, AK · Accident · No injuries · Data collection · Final report · Mar 15, 2005 · N422R · Substantial damage
  > The pilot's continued flight into adverse weather conditions, and his failure to maintain adequate clearance while maneuvering, which resulted in an in-flight collision with terrain. Factors associated with the accident are flat light, whiteout conditions,…
- [NTSB DFW05FA086](https://openairdocs.org/ntsb/DFW05FA086.md): Bell 206B-3 · Shelbyville, TX · Accident · 3 fatal · Field investigation · Final report · Mar 10, 2005 · N85BH · Substantial damage
  > The pilot's failure to maintain altitude and clearance for undetermined reasons.
- [NTSB NYC05CA047](https://openairdocs.org/ntsb/NYC05CA047.md): Bell 206B · Lancaster, PA · Accident · No injuries · Data collection · Final report · Feb 1, 2005 · N59MB · Substantial damage
  > The pilot's loss of lateral control while attempting to transition to a hover from the ground. A factor was the bright sunlight conditions.
- [NTSB DFW05TA056](https://openairdocs.org/ntsb/DFW05TA056.md): Schweizer 269D · San Antonio, TX · Accident · Minor injuries · Final report · Jan 18, 2005 · N296RL · Substantial damage
  > The inadequate supervision and delayed remedial action by the flight instructor, which resulted in an inadvertent dynamic rollover.

Next page: https://openairdocs.org/ntsb.md?engine=03020&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 ('03020'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?engine=03020&page=3

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