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NTSB investigations: Allison 250 SER 250HP, AK

27 cases on aircraft whose registry engine model is Allison 250 SER 250HP. 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

19692026

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 ('03002', '03003')) 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 ('03002', '03003'))
  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 ('03002', '03003'))
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 ANC08LA127Accident · Serious injuriesLimited investigationFinal reportBell Helicopter Textron 206L-1 · Homer, AKThe 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.Sep 26, 2008 · N305MH · Substantial damage NTSB ANC08LA040Accident · Minor injuriesLimited investigationFinal reportBell 206L · Nikolai, AKThe 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.Mar 4, 2008 · N404EH · Substantial damage NTSB ANC03LA082Accident · Minor injuriesLimited investigationFinal reportHughes 369D · Ketchikan, AKThe 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…Jul 21, 2003 · N1091S · Substantial damage NTSB ANC01LA030Accident · No injuriesLimited investigationFinal reportBell 206L-1 · Tyonek, AKThe pilot's failure to maintain adequate tail rotor clearance while maneuvering to land.Jan 18, 2001 · N80KA · Substantial damage NTSB ANC99TA029Accident · Minor injuriesFinal reportBell 206L-1 · Barrow, AKThe pilot's misjudged flare while landing. Factors associated with the accident were whiteout conditions, and the snow-covered terrain.Feb 24, 1999 · N785SR · Substantial damage NTSB ANC98TA162Accident · Serious injuriesFinal reportHughes 369D · Homer, AKThe 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.Sep 27, 1998 · N1091P · Minor damage NTSB ANC96LA154Accident · Serious injuriesLimited investigationFinal reportBell 206B · Cantwell, AKthe pilot's continued VFR flight into instrument meteorological conditions (IMC). The terrain conditions, low ceiling, fog, and whiteout conditions were related factors.Sep 13, 1996 · N7982J · Destroyed NTSB ANC94LA064Accident · No injuriesLimited investigationFinal reportHiller FH1100 · Tyonek, AKThe pilot's selection of unsuitable terrain for landing which resulted in a dynamic rollover. A factor was the soft landing area selected.Jun 4, 1994 · N746FH · Substantial damage NTSB ANC93FA064Accident · Serious injuriesField investigationFinal reportFairchild FH-1100 · Malina Bay, AKThe 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.May 17, 1993 · N5060F · Substantial damage NTSB ANC91FA001Accident · Serious injuriesField investigationFinal reportHughes 500D · Kennsington, AKThe 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.Oct 4, 1990 · N1107G · Substantial damage NTSB SEA89LA170Accident · No injuriesLimited investigationFinal reportHughes 369D · Petersburg, AKThe 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.Sep 9, 1989 · N1088N · Substantial damage NTSB ANC88LA086Accident · No injuriesLimited investigationFinal reportHughes 369D · Kitoi Bay, AKThe 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…Jul 9, 1988 · N1089D · Substantial damage NTSB ANC83LA138Accident · No injuriesLimited investigationFinal reportHughes 369D · Mcgrath, AKThe 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…Aug 5, 1983 · N1106Z · Substantial damage NTSB ANC83FA032Accident · 1 fatalField investigationFinal reportBell 206B · Cordova, AKThe 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…Jan 13, 1983 · N74PR · Destroyed NTSB SEA82FA070Accident · Minor injuriesField investigationFinal reportHughes 369D · 6nm Sse Wrangel, AKThe 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…May 13, 1982 · N1107T · Substantial damage NTSB ANC79DA086Accident · Serious injuriesClosedHughes 500C · Alakanuk, AKSep 2, 1979 · N9090F · Substantial damage NTSB ANC77DA088Accident · No injuriesClosedHiller Acft 1100 · Sparrevohn Afs, AKSep 11, 1977 · N5052F · Substantial damage NTSB ANC74AA023Accident · No injuriesClosedHiller Acft FH1100 · Umiat, AKAug 14, 1973 · N546FH · Substantial damage NTSB ANC74FAG02Accident · No injuriesClosedHiller Acft FH1100 · Anchorage, AKJul 6, 1973 · N5052F · 2 aircraft · Substantial damage NTSB ANC71AA024Accident · Minor injuriesClosedBell 206A · Sagwon, AKOct 23, 1970 · N7890S · Substantial damage NTSB ANC71DAA21Accident · Minor injuriesClosedBell 206A · Anaktvk Pass, AKOct 10, 1970 · N7865S · Substantial damage NTSB ANC71AA009Accident · 1 fatalClosedBell 206A · Fairbanks, AKAug 1, 1970 · N6253N · Substantial damage NTSB ANC70IA092Incident · No injuriesClosedHiller Acft FH1100 · Delta Junctn, AKJun 22, 1970 · N590FH · Minor damage NTSB ANC70AA064Accident · No injuriesClosedBell 206A · Chignik, AKMar 19, 1970 · N1416W · Substantial damage NTSB ANC70A0012Accident · No injuriesClosedHiller Acft FH1100 · Fairbanks, AKAug 3, 1969 · N421FH · Substantial damage NTSB ANC70A0004Accident · No injuriesClosedBell 206A · Barrow, AKJul 13, 1969 · N7865S · Substantial damage NTSB ANC70A0002Accident · No injuriesClosedHiller Acft FH1100 · Mcgrath, AKJul 3, 1969 · N748FH · Substantial damage