# NTSB investigations: Allison 250-C20 series, 2006

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.

## Latest cases

- [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…

## 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 year(c."eventDate") = 2006
  AND 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&year=2006

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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.