# NTSB investigations: Allison 250 SER 250HP, AK

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 ANC08LA127](https://openairdocs.org/ntsb/ANC08LA127.md): Bell Helicopter Textron 206L-1 · Homer, AK · Accident · Serious injuries · Limited investigation · Final report · Sep 26, 2008 · N305MH · Substantial damage
  > The pilot's failure to maintain clearance from power lines during an external load lift. Contributing to the accident was the pilot's lack of situational awareness.
- [NTSB ANC08LA040](https://openairdocs.org/ntsb/ANC08LA040.md): Bell 206L · Nikolai, AK · Accident · Minor injuries · Limited investigation · Final report · Mar 4, 2008 · N404EH · Substantial damage
  > The pilot's inadequate compensation for wind conditions, and an inadvertent loss of tail rotor effectiveness while maneuvering. A factor contributing to the accident was wind gusts.
- [NTSB ANC03LA082](https://openairdocs.org/ntsb/ANC03LA082.md): Hughes 369D · Ketchikan, AK · Accident · Minor injuries · Limited investigation · Final report · Jul 21, 2003 · N1091S · Substantial damage
  > The improper installation of a bolt in the gas generator governor linkage by company maintenance personnel, which resulted in a loss of the bolt, a loss of engine power while maneuvering, and subsequent forced landing and collision with trees. Factors…
- [NTSB ANC01LA030](https://openairdocs.org/ntsb/ANC01LA030.md): Bell 206L-1 · Tyonek, AK · Accident · No injuries · Limited investigation · Final report · Jan 18, 2001 · N80KA · Substantial damage
  > The pilot's failure to maintain adequate tail rotor clearance while maneuvering to land.
- [NTSB ANC99TA029](https://openairdocs.org/ntsb/ANC99TA029.md): Bell 206L-1 · Barrow, AK · Accident · Minor injuries · Final report · Feb 24, 1999 · N785SR · Substantial damage
  > The pilot's misjudged flare while landing. Factors associated with the accident were whiteout conditions, and the snow-covered terrain.
- [NTSB ANC98TA162](https://openairdocs.org/ntsb/ANC98TA162.md): Hughes 369D · Homer, AK · Accident · Serious injuries · Final report · Sep 27, 1998 · N1091P · Minor damage
  > The passenger not following the instructions given by the pilot. Contributing factors were the rising terrain and the pilot's diverted attention during the toe in landing.
- [NTSB ANC96LA154](https://openairdocs.org/ntsb/ANC96LA154.md): Bell 206B · Cantwell, AK · Accident · Serious injuries · Limited investigation · Final report · Sep 13, 1996 · N7982J · Destroyed
  > the pilot's continued VFR flight into instrument meteorological conditions (IMC). The terrain conditions, low ceiling, fog, and whiteout conditions were related factors.
- [NTSB ANC94LA064](https://openairdocs.org/ntsb/ANC94LA064.md): Hiller FH1100 · Tyonek, AK · Accident · No injuries · Limited investigation · Final report · Jun 4, 1994 · N746FH · Substantial damage
  > The pilot's selection of unsuitable terrain for landing which resulted in a dynamic rollover. A factor was the soft landing area selected.
- [NTSB ANC93FA064](https://openairdocs.org/ntsb/ANC93FA064.md): Fairchild FH-1100 · Malina Bay, AK · Accident · Serious injuries · Field investigation · Final report · May 17, 1993 · N5060F · Substantial damage
  > The installation of a bogus transmission to engine driveshaft. The failure of the company maintenance personnel to comply with the service bulletins and letters was a factor.
- [NTSB ANC91FA001](https://openairdocs.org/ntsb/ANC91FA001.md): Hughes 500D · Kennsington, AK · Accident · Serious injuries · Field investigation · Final report · Oct 4, 1990 · N1107G · Substantial damage
  > The loss of control during takeoff due to dynamic rollover. Contributing to the accident was the pilot-in-command's selection of an uneven landing area.
- [NTSB SEA89LA170](https://openairdocs.org/ntsb/SEA89LA170.md): Hughes 369D · Petersburg, AK · Accident · No injuries · Limited investigation · Final report · Sep 9, 1989 · N1088N · Substantial damage
  > The pilot failed to obtain clearance over trees. Contributing to the accident was: the aircraft being above its maximum certificated gross weight limitation and the trees.
- [NTSB ANC88LA086](https://openairdocs.org/ntsb/ANC88LA086.md): Hughes 369D · Kitoi Bay, AK · Accident · No injuries · Limited investigation · Final report · Jul 9, 1988 · N1089D · Substantial damage
  > The helicopter landed with the left skid against a survey stake which protruded from the ground about 6 inches. Upon liftoff the skid did not clear the metal stake before the helicopter started moving laterally to the left. The left skid remained against the…
- [NTSB ANC83LA138](https://openairdocs.org/ntsb/ANC83LA138.md): Hughes 369D · Mcgrath, AK · Accident · No injuries · Limited investigation · Final report · Aug 5, 1983 · N1106Z · Substantial damage
  > The plt stated that he was flying straight & level at aprx 700 ft AGL, when the eng-out light illuminated. He began an autorotation to a ridgeline. During the landing, the main rotor blades contacted the tail boom & severed it from the main fuselage. An…
- [NTSB ANC83FA032](https://openairdocs.org/ntsb/ANC83FA032.md): Bell 206B · Cordova, AK · Accident · 1 fatal · Field investigation · Final report · Jan 13, 1983 · N74PR · Destroyed
  > The helicopter was on a rescue/recovery flt for the Alaska state troopers with the plt & a state trooper on board. They departed in variable wx conditions to rescue the plt of another acft. Reportedly, snow was falling in the search area & the winds were…
- [NTSB SEA82FA070](https://openairdocs.org/ntsb/SEA82FA070.md): Hughes 369D · 6nm Sse Wrangel, AK · Accident · Minor injuries · Field investigation · Final report · May 13, 1982 · N1107T · Substantial damage
  > The pilot reported that the aircraft was on a reconnaissance flight to survey a proposed powerline project. He reported that during the flight, the engine flamed out and an autorotation was initiated. He maneuvered the helicopter to land in a clearance, but…
- [NTSB ANC79DA086](https://openairdocs.org/ntsb/ANC79DA086.md): Hughes 500C · Alakanuk, AK · Accident · Serious injuries · Closed · Sep 2, 1979 · N9090F · Substantial damage
- [NTSB ANC77DA088](https://openairdocs.org/ntsb/ANC77DA088.md): Hiller Acft 1100 · Sparrevohn Afs, AK · Accident · No injuries · Closed · Sep 11, 1977 · N5052F · Substantial damage
- [NTSB ANC74AA023](https://openairdocs.org/ntsb/ANC74AA023.md): Hiller Acft FH1100 · Umiat, AK · Accident · No injuries · Closed · Aug 14, 1973 · N546FH · Substantial damage
- [NTSB ANC74FAG02](https://openairdocs.org/ntsb/ANC74FAG02.md): Hiller Acft FH1100 · Anchorage, AK · Accident · No injuries · Closed · Jul 6, 1973 · N5052F · 2 aircraft · Substantial damage
- [NTSB ANC71AA024](https://openairdocs.org/ntsb/ANC71AA024.md): Bell 206A · Sagwon, AK · Accident · Minor injuries · Closed · Oct 23, 1970 · N7890S · Substantial damage
- [NTSB ANC71DAA21](https://openairdocs.org/ntsb/ANC71DAA21.md): Bell 206A · Anaktvk Pass, AK · Accident · Minor injuries · Closed · Oct 10, 1970 · N7865S · Substantial damage
- [NTSB ANC71AA009](https://openairdocs.org/ntsb/ANC71AA009.md): Bell 206A · Fairbanks, AK · Accident · 1 fatal · Closed · Aug 1, 1970 · N6253N · Substantial damage
- [NTSB ANC70IA092](https://openairdocs.org/ntsb/ANC70IA092.md): Hiller Acft FH1100 · Delta Junctn, AK · Incident · No injuries · Closed · Jun 22, 1970 · N590FH · Minor damage
- [NTSB ANC70AA064](https://openairdocs.org/ntsb/ANC70AA064.md): Bell 206A · Chignik, AK · Accident · No injuries · Closed · Mar 19, 1970 · N1416W · Substantial damage
- [NTSB ANC70A0012](https://openairdocs.org/ntsb/ANC70A0012.md): Hiller Acft FH1100 · Fairbanks, AK · Accident · No injuries · Closed · Aug 3, 1969 · N421FH · Substantial damage
- [NTSB ANC70A0004](https://openairdocs.org/ntsb/ANC70A0004.md): Bell 206A · Barrow, AK · Accident · No injuries · Closed · Jul 13, 1969 · N7865S · Substantial damage
- [NTSB ANC70A0002](https://openairdocs.org/ntsb/ANC70A0002.md): Hiller Acft FH1100 · Mcgrath, AK · Accident · No injuries · Closed · Jul 3, 1969 · N748FH · Substantial damage

## 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" = 'AK' 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 ('03002', '03003'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?engine=03002&state=AK

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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.