Skip to content

NTSB investigations: Allison 250 SER 400HP, AK

26 cases on aircraft whose registry engine model is Allison 250 SER 400HP. Aircraft are matched to the registry by N-number and event date, checked against the reported serial number, make and model, so older matches can be wrong.

Defining event

Finding

Phase of flight

Aircraft model

Cases per year

19732026

Where

Latest cases

Query with 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

duckdb -csv -c "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"

Prints the whole list as CSV. It reads the release’s Parquet files over HTTPS, so there’s nothing to download first. Install DuckDB to run it.

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

Run it at the DuckDB prompt, or in any tool that reads Parquet over HTTPS. More ways to query the release are on Use the data.

NTSB ANC15CA012Accident · No injuriesData collectionFinal reportBell 206B · Palmer, AKThe 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…Mar 10, 2015 · N86TA · Substantial damage NTSB ANC00LA053Accident · No injuriesLimited investigationFinal reportBell 206B · Homer, AKThe pilot's misjudging the landing flare in whiteout/flat light conditions. Factors associated with the accident are the whiteout and flat lighting conditions.May 1, 2000 · N301MH · Substantial damage NTSB ANC99TA090Accident · No injuriesFinal reportBell 206B · Deadhorse, AKA failure of the pilot-in-command to perform an adequate preflight inspection, and remove a rotor blade tie-down strap.Jul 8, 1999 · N47122 · Substantial damage NTSB ANC98TA125Accident · No injuriesFinal reportBell 206B II · Chickaloon, AKA fracture of the main rotor drag pin assembly.Aug 15, 1998 · N70711 · Substantial damage NTSB ANC98TA011Accident · No injuriesFinal reportBell 206B · Anchorage, AKThe pilot's failure to maintain adequate rotor RPM during an autorotation landing.Dec 5, 1997 · N83146 · Substantial damage NTSB ANC98LA003Accident · No injuriesLimited investigationFinal reportBell 206-B2 · Sutton, AKThe 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.Oct 15, 1997 · N86TA · Substantial damage NTSB ANC96LA111Accident · Minor injuriesLimited investigationFinal reportMcDonnell Douglas MD369D · Healy, AKThe 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.Aug 4, 1996 · N58269 · 2 aircraft · No damage NTSB ANC96LA097Accident · No injuriesLimited investigationFinal reportBell 206B · Juneau, AKThe pilot's failure to maintain proper alignment while lifting the helicopter to a hover and inducing a dynamic roll to avoid striking a passenger.Jul 8, 1996 · N2761F · Substantial damage NTSB ANC95LA112Accident · No injuriesLimited investigationFinal reportBell 206B-3 · Bettles, AKFailure 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.Jul 21, 1995 · N58129 · Substantial damage NTSB ANC94LA110Accident · No injuriesLimited investigationFinal reportBell B-206 · Gustavus, AKThe 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…Aug 31, 1994 · N382EH · Substantial damage NTSB ANC93T#A05Incident · No injuriesClass 3Final reportBell BH-206B · Kantishna, AKAug 17, 1993 · N59387 · Minor damage NTSB ANC92FA159Accident · Serious injuriesField investigationFinal reportHughes 369D · Nunavaugaluk Lk, AKThe 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…Sep 9, 1992 · N8697F · Substantial damage NTSB ANC92LA090Accident · No injuriesLimited investigationFinal reportMcDonnell Douglas MD-500D · Polk Inlet, AKThe pilot's failure to follow proper procedure and the company's inadequate procedures and directives. A factor was the uneven terrain.Jun 10, 1992 · N8395F · Substantial damage NTSB ANC84LA012Accident · Serious injuriesLimited investigationFinal reportBell 206-B · Kodiak, AKWhile 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…Oct 30, 1983 · N90188 · Destroyed NTSB ANC83FA066Accident · Serious injuriesField investigationFinal reportBell 206B · Stony River, AKThe 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…Apr 6, 1983 · N376KA · Substantial damage NTSB ANC82DA039Accident · No injuriesFinal reportHughes 369HS · Tok, AKThe 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…May 4, 1982 · N9239F · Substantial damage NTSB ANC81FA055Accident · Minor injuriesClosedHughes 369D · Glennallen, AKMay 25, 1981 · N211EH · Substantial damage NTSB ANC80DA083Accident · Minor injuriesClosedHughes 500C · Sitka, AKAug 12, 1980 · N9052F · Substantial damage NTSB ANC80DA080Accident · No injuriesClosedHughes 369 · Kivalina, AKAug 2, 1980 · N50SC · Substantial damage NTSB ANC77FA086Accident · Minor injuriesClosedHughes 369HS · Cantwell, AKSep 2, 1977 · N9138F · Substantial damage NTSB ANC76AA123Accident · 1 fatalClosedHiller Acft UH12EJ · Sheep Mountain, AKAug 15, 1976 · N47078 · Destroyed NTSB ANC76AA109Accident · Serious injuriesClosedHughes 369HS · Juneau, AKJul 9, 1976 · N55ST · Substantial damage NTSB ANC76AA094Accident · No injuriesClosedBell 206B · Coldfoot, AKJun 3, 1976 · N90188 · Substantial damage NTSB ANC76AA011Accident · Minor injuriesClosedHughes 369HS · Deadhorse, AKJul 21, 1975 · N717ST · Substantial damage NTSB ANC75AA070Accident · No injuriesClosedBell 206B · Allison Lake, AKMar 25, 1975 · N58012 · Substantial damage NTSB ANC74FAA19Accident · Minor injuriesClosedHiller Acft FH1100 · Fairbanks, AKOct 23, 1973 · N369FH · Substantial damage