# NTSB investigations: Allison 250-C20 series, HI

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 ANC24LA012](https://openairdocs.org/ntsb/ANC24LA012.md): Mcdonnell Douglas Helicopter 369E · Waialua, HI · Accident · No injuries · Class 4 · Limited · Final report · Jan 25, 2024 · N545PH · Substantial damage
  > The pilot's inability to maintain directional control after a skid got caught on a fence while he was maneuvering the helicopter for takeoff, which resulted in a dynamic roll-over.
- [NTSB WPR19LA087](https://openairdocs.org/ntsb/WPR19LA087.md): MD Helicopter 369 · Kukuihaele, HI · Accident · Serious injuries · Class 3 · Limited · Final report · Feb 21, 2019 · N506PH · Substantial damage
  > The partial loss of engine power due to corrosion in the engine bleed valve due to wash solution intrusion. Contributing to the accident was the installation of a bushing manufactured to incorrect dimensions in the bleed valve, and the uneven terrain at the…
- [NTSB WPR12LA125](https://openairdocs.org/ntsb/WPR12LA125.md): Aerospatiale AS 355F1 · Makakilo City, HI · Accident · No injuries · Limited investigation · Final report · Mar 3, 2012 · N101MZ · Substantial damage
  > A partial loss of engine power while maneuvering over rough/uneven terrain that was precipitated by the failure of a 3rd stage turbine blade as a result of high-cycle fatigue.
- [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 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 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 LAX04CA315](https://openairdocs.org/ntsb/LAX04CA315.md): Bell 206B · Kahului, HI · Accident · Minor injuries · Data collection · Final report · Aug 16, 2004 · N529RS · Substantial damage
  > the pilot's inadequate compensation for the gusty crosswind conditions, which resulted in a dynamic rollover. Contributing factors were the direct crosswind and his lack of total experience in the accident helicopter make and model.
- [NTSB LAX04LA116](https://openairdocs.org/ntsb/LAX04LA116.md): Hughes 369D · Wahiawa, HI · Accident · No injuries · Limited investigation · Final report · Dec 18, 2003 · N1113L · Substantial damage
  > The pilot's failure to properly secure the external sling load, which allowed the load to shift, and subsequently strike and remove the tail rotor.
- [NTSB LAX03LA017](https://openairdocs.org/ntsb/LAX03LA017.md): Hughes 369D · Kaaawa, Oahu, HI · Accident · Serious injuries · Limited investigation · Final report · Oct 29, 2002 · N220AL · Destroyed
  > Dynamic rollover during an attempted takeoff, due to the combined effects of the soft sloping terrain and the pilot's failure to redistribute the passengers to a more favorable lateral CG condition.
- [NTSB LAX01FA306](https://openairdocs.org/ntsb/LAX01FA306.md): Bell 206B · Hilo, HI · Accident · Minor injuries · Field investigation · Final report · Sep 30, 2001 · N206KS · Destroyed
  > The failure of the mechanic to secure the No. 8 bearing thrust nut during maintenance work, which resulted in the total failure of the first stage turbine wheel shaft. Also causal was his misjudgment of his height during the flare resulting in a hard landing.…
- [NTSB LAX00MA273](https://openairdocs.org/ntsb/LAX00MA273.md): Aerospatiale AS 355F1 · Kahului, Maui, HI · Accident · 7 fatal · Major investigation · Final report · Jul 21, 2000 · N510TG · Destroyed
  > The pilot's inadequate decision by which he continued visual flight rules flight into instrument meteorological conditions. Also causal was his failure to maintain terrain clearance resulting in a collision with mountainous terrain. A contributing factor was…
- [NTSB LAX96LA104](https://openairdocs.org/ntsb/LAX96LA104.md): Bell 206BIII · Kamuela, HI · Accident · No injuries · Limited investigation · Final report · Feb 1, 1996 · N90194 · Substantial damage
  > failure of the nose case (No.1) bearing resulting in oil starvation.
- [NTSB LAX94LA352](https://openairdocs.org/ntsb/LAX94LA352.md): Hughes 369E · Volcano, HI · Accident · Minor injuries · Limited investigation · Final report · Sep 4, 1994 · N279F · Substantial damage
  > the pilot's failure to maintain adequate main rotor rpm and the resultant inadvertent skid contact with the ground.
- [NTSB LAX94LA241](https://openairdocs.org/ntsb/LAX94LA241.md): Hughes 369D · Kaneohe, HI · Accident · No injuries · Limited investigation · Final report · Jun 7, 1994 · N4943T · Substantial damage
  > the operator's and pilot's failure to ensure that the cargo net containing empty paper bags was sufficiently ballasted to prevent it from flying up into the tail rotor.
- [NTSB LAX93LA249](https://openairdocs.org/ntsb/LAX93LA249.md): Hughes 369D · Kahului, HI · Accident · No injuries · Limited investigation · Final report · Jun 11, 1993 · N1113L · Substantial damage
  > The failure of the pilot to maintain adequate ground obstruction clearance while engaged in a cattle herding operation.
- [NTSB LAX93LA132](https://openairdocs.org/ntsb/LAX93LA132.md): Hughes 369D · Kahului, HI · Accident · Serious injuries · Limited investigation · Final report · Feb 22, 1993 · N58240 · Substantial damage
  > The pilots failure to maintain an adequate visual lookout for obstructions while performing a low altitude surveillance operation in a mountainous area, and, his failure to select an altitude sufficient to ensure clearance from all potential obstacles.
- [NTSB LAX91LA058](https://openairdocs.org/ntsb/LAX91LA058.md): Mcdonnell Douglas 369D · Keanae, HI · Accident · Minor injuries · Limited investigation · Final report · Dec 18, 1990 · N58240 · Substantial damage
  > Fuel starvation caused by a loose fuel line 'b' nut, due to improper maintenance; and the failure of the pilot to correctly judge the landing flare during the autorotation.
- [NTSB LAX91LA054](https://openairdocs.org/ntsb/LAX91LA054.md): Mcdonnell Douglas 369D · Haleakla Nat Pk, HI · Accident · 1 fatal · Limited investigation · Final report · Dec 9, 1990 · N1113L · Substantial damage
  > Fuel starvation due to the unporting of the fuel supply pick-up.
- [NTSB LAX88LA179](https://openairdocs.org/ntsb/LAX88LA179.md): McDonnell Douglas 369D · Waialua, HI · Accident · Serious injuries · Limited investigation · Final report · May 13, 1988 · N4943T · Destroyed
  > Failure to follow procedures established by the manufacture for uncommanded trim inputs and his decision to make a hover approach to landing.
- [NTSB LAX88LA136](https://openairdocs.org/ntsb/LAX88LA136.md): Bell 206B · Honolulu, HI · Accident · No injuries · Limited investigation · Final report · Mar 18, 1988 · N2995W · Substantial damage
  > After touchdown the plt reduced the throttle and removed his left hand from the throttle/collective pitch control to retune the radio. His attention was directed to the frequency indicator during the procedure. The helicopter became airborne and moved to the…
- [NTSB LAX88LA043](https://openairdocs.org/ntsb/LAX88LA043.md): Hughes 369D · Honolulu, HI · Accident · No injuries · Limited investigation · Final report · Nov 14, 1987 · N1113L · Substantial damage
  > The plt rprtd that during an external load operation, the helicopter ran out of fuel. Subsequently, it was damaged when it touched down hard during a forced landing.
- [NTSB LAX87LA310](https://openairdocs.org/ntsb/LAX87LA310.md): Bell 206B · Kailua-Kona, HI · Accident · Minor injuries · Limited investigation · Final report · Aug 23, 1987 · N2777R · Substantial damage
  > As the helicopter was climbing over rising terrain at 300' to 400' AGL, the plt noted altimeter & airspeed indcns of 8700' & 60 mph. After climbing an adnl 2 min to aprx 10,000' (12,000' density alt), he noticed the rotor RPM was bleeding off. He made a 180…
- [NTSB LAX86LA091](https://openairdocs.org/ntsb/LAX86LA091.md): Bell 206B-3 · Waimea, HI · Accident · Minor injuries · Limited investigation · Final report · Jan 16, 1986 · N3179X · Substantial damage
  > While on a local flt, the plt descended to aprx 500 ft AGL and flew the helicopter along a coastal area. He reported the helicopter suddenly lost power and he initiated an autorotative landing to the beach where the helicopter 'had a hard landing.' An exam…
- [NTSB LAX85LA282](https://openairdocs.org/ntsb/LAX85LA282.md): Bell 206B-III · Lahaina, HI · Accident · No injuries · Limited investigation · Final report · Jun 15, 1985 · N3179X · Substantial damage
  > The pilot reported that the engine failed at an altitude of 800 feet MSL during the climb to cruise phase of a sightseeing flight with 3 passengers on board. The acft landed in the surf of the pacific ocean and damaged the tail rotor. The pilot and passengers…

## 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."eventStateOrRegion" = 'HI' AND c."eventCountry" = 'USA'
  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&state=HI

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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.