# NTSB investigations: Allison 250 SER 400HP, 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 ANC15CA012](https://openairdocs.org/ntsb/ANC15CA012.md): Bell 206B · Palmer, AK · Accident · No injuries · Data collection · Final report · Mar 10, 2015 · N86TA · Substantial damage
  > The pilot's failure to maintain control while hovering at a low altitude, which resulted in an impact with frozen lake ice. Contributing to the accident was the pilot's decision to operate the helicopter from the left seat contrary to the rotorcraft flight…
- [NTSB ANC00LA053](https://openairdocs.org/ntsb/ANC00LA053.md): Bell 206B · Homer, AK · Accident · No injuries · Limited investigation · Final report · May 1, 2000 · N301MH · Substantial damage
  > The pilot's misjudging the landing flare in whiteout/flat light conditions. Factors associated with the accident are the whiteout and flat lighting conditions.
- [NTSB ANC99TA090](https://openairdocs.org/ntsb/ANC99TA090.md): Bell 206B · Deadhorse, AK · Accident · No injuries · Final report · Jul 8, 1999 · N47122 · Substantial damage
  > A failure of the pilot-in-command to perform an adequate preflight inspection, and remove a rotor blade tie-down strap.
- [NTSB ANC98TA125](https://openairdocs.org/ntsb/ANC98TA125.md): Bell 206B II · Chickaloon, AK · Accident · No injuries · Final report · Aug 15, 1998 · N70711 · Substantial damage
  > A fracture of the main rotor drag pin assembly.
- [NTSB ANC98TA011](https://openairdocs.org/ntsb/ANC98TA011.md): Bell 206B · Anchorage, AK · Accident · No injuries · Final report · Dec 5, 1997 · N83146 · Substantial damage
  > The pilot's failure to maintain adequate rotor RPM during an autorotation landing.
- [NTSB ANC98LA003](https://openairdocs.org/ntsb/ANC98LA003.md): Bell 206-B2 · Sutton, AK · Accident · No injuries · Limited investigation · Final report · Oct 15, 1997 · N86TA · Substantial damage
  > The pilot's failure to maintain clearance between the tail rotor and the external long line cable, and the subsequent entanglement of the tail rotor with the long line.
- [NTSB ANC96LA111](https://openairdocs.org/ntsb/ANC96LA111.md): McDonnell Douglas MD369D · Healy, AK · Accident · Minor injuries · Limited investigation · Final report · Aug 4, 1996 · N58269 · 2 aircraft · No damage
  > The inadequate visual outlook by the pilots of both aircraft, and their failure to see and avoid the other aircraft. A factor associated with the accident was sunglare affecting the helicopter pilot's vision.
- [NTSB ANC96LA097](https://openairdocs.org/ntsb/ANC96LA097.md): Bell 206B · Juneau, AK · Accident · No injuries · Limited investigation · Final report · Jul 8, 1996 · N2761F · Substantial damage
  > The pilot's failure to maintain proper alignment while lifting the helicopter to a hover and inducing a dynamic roll to avoid striking a passenger.
- [NTSB ANC95LA112](https://openairdocs.org/ntsb/ANC95LA112.md): Bell 206B-3 · Bettles, AK · Accident · No injuries · Limited investigation · Final report · Jul 21, 1995 · N58129 · Substantial damage
  > Failure of the pilot to ensuring the sling cable was free of the skid before lifting off into a hover, which allowed the cable to become wrapped (entangled) around the skid.
- [NTSB ANC94LA110](https://openairdocs.org/ntsb/ANC94LA110.md): Bell B-206 · Gustavus, AK · Accident · No injuries · Limited investigation · Final report · Aug 31, 1994 · N382EH · Substantial damage
  > The pilot misjudged his distance/altitude from the landing area, and his lack of recent night flying experience. Factors which contributed to the accident were: the pilot's failure to assure that he would be landing with sufficient light, and the dusk/dark…
- [NTSB ANC93T#A05](https://openairdocs.org/ntsb/ANC93T%23A05.md): Bell BH-206B · Kantishna, AK · Incident · No injuries · Class 3 · Final report · Aug 17, 1993 · N59387 · Minor damage
- [NTSB ANC92FA159](https://openairdocs.org/ntsb/ANC92FA159.md): Hughes 369D · Nunavaugaluk Lk, AK · Accident · Serious injuries · Field investigation · Final report · Sep 9, 1992 · N8697F · Substantial damage
  > The separation of the tail rotor abrasion strip and the subsequent total loss of the tail rotor. Factors contributing to the accident were: insufficient manufacturer's maintenance design changes, inadequate aircraft equipment design by the manufacturer and…
- [NTSB ANC92LA090](https://openairdocs.org/ntsb/ANC92LA090.md): McDonnell Douglas MD-500D · Polk Inlet, AK · Accident · No injuries · Limited investigation · Final report · Jun 10, 1992 · N8395F · Substantial damage
  > The pilot's failure to follow proper procedure and the company's inadequate procedures and directives. A factor was the uneven terrain.
- [NTSB ANC84LA012](https://openairdocs.org/ntsb/ANC84LA012.md): Bell 206-B · Kodiak, AK · Accident · Serious injuries · Limited investigation · Final report · Oct 30, 1983 · N90188 · Destroyed
  > While inspecting a transmission wire tower, the left skid became entangled with the power line guide. This pulled the helicopter out of CG. While the plt was trying to correct the problem, the m/r blade contacted the tower & struck the tail boom separating…
- [NTSB ANC83FA066](https://openairdocs.org/ntsb/ANC83FA066.md): Bell 206B · Stony River, AK · Accident · Serious injuries · Field investigation · Final report · Apr 6, 1983 · N376KA · Substantial damage
  > The plt was on an external load operation with a 100 ft long line. The long line had 4 remote hooks, of which, 3 had cable bags attached. While waiting for the 4th bag to be filled, he decided to land in an open area. He set the external load down & laid the…
- [NTSB ANC82DA039](https://openairdocs.org/ntsb/ANC82DA039.md): Hughes 369HS · Tok, AK · Accident · No injuries · Final report · May 4, 1982 · N9239F · Substantial damage
  > The pilot was conducting a non-revenue, sling-load operation on mt neuberer, while donating his services to Tok community tv, inc. he stated that he was lifting three empty propane bottles from a snow field when he noticed the auto relight lamp flash. He…
- [NTSB ANC81FA055](https://openairdocs.org/ntsb/ANC81FA055.md): Hughes 369D · Glennallen, AK · Accident · Minor injuries · Closed · May 25, 1981 · N211EH · Substantial damage
- [NTSB ANC80DA083](https://openairdocs.org/ntsb/ANC80DA083.md): Hughes 500C · Sitka, AK · Accident · Minor injuries · Closed · Aug 12, 1980 · N9052F · Substantial damage
- [NTSB ANC80DA080](https://openairdocs.org/ntsb/ANC80DA080.md): Hughes 369 · Kivalina, AK · Accident · No injuries · Closed · Aug 2, 1980 · N50SC · Substantial damage
- [NTSB ANC77FA086](https://openairdocs.org/ntsb/ANC77FA086.md): Hughes 369HS · Cantwell, AK · Accident · Minor injuries · Closed · Sep 2, 1977 · N9138F · Substantial damage
- [NTSB ANC76AA123](https://openairdocs.org/ntsb/ANC76AA123.md): Hiller Acft UH12EJ · Sheep Mountain, AK · Accident · 1 fatal · Closed · Aug 15, 1976 · N47078 · Destroyed
- [NTSB ANC76AA109](https://openairdocs.org/ntsb/ANC76AA109.md): Hughes 369HS · Juneau, AK · Accident · Serious injuries · Closed · Jul 9, 1976 · N55ST · Substantial damage
- [NTSB ANC76AA094](https://openairdocs.org/ntsb/ANC76AA094.md): Bell 206B · Coldfoot, AK · Accident · No injuries · Closed · Jun 3, 1976 · N90188 · Substantial damage
- [NTSB ANC76AA011](https://openairdocs.org/ntsb/ANC76AA011.md): Hughes 369HS · Deadhorse, AK · Accident · Minor injuries · Closed · Jul 21, 1975 · N717ST · Substantial damage
- [NTSB ANC75AA070](https://openairdocs.org/ntsb/ANC75AA070.md): Bell 206B · Allison Lake, AK · Accident · No injuries · Closed · Mar 25, 1975 · N58012 · Substantial damage
- [NTSB ANC74FAA19](https://openairdocs.org/ntsb/ANC74FAA19.md): Hiller Acft FH1100 · Fairbanks, AK · Accident · Minor injuries · Closed · Oct 23, 1973 · N369FH · 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 ('03013', '03012'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?engine=03013&state=AK

---
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.