NTSB investigations: Franklin 6A4150 series, AK
34 cases on aircraft whose registry engine model is Franklin 6A4150 series. 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.
Cases per year
| 1968 | 1 |
|---|---|
| 1969 | 1 |
| 1970 | 1 |
| 1971 | 1 |
| 1972 | 1 |
| 1973 | 1 |
| 1974 | 3 |
| 1975 | 3 |
| 1976 | 1 |
| 1977 | 3 |
| 1982 | 2 |
| 1983 | 2 |
| 1988 | 1 |
| 1990 | 1 |
| 1992 | 1 |
| 1994 | 1 |
| 1997 | 1 |
| 1998 | 1 |
| 2003 | 1 |
| 2009 | 1 |
| 2010 | 1 |
| 2012 | 1 |
| 2021 | 1 |
| 2023 | 1 |
| 2024 | 1 |
| 2025 | 1 |
Where
Open the mapLatest cases
Query with SQL
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 ('27024'))
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 ('27024'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESCRun 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 ANC25LA052Accident · Minor injuriesClass 3 · LimitedPreliminary reportStinson 108 · Cantwell, AKOn June 14, 2025, about 1415 Alaska daylight time, a Stinson 108 airplane, N2101Q, was substantially damaged when it was involved in an accident near Cantwell, Alaska. The pilot and passenger sustained minor injuries. The airplane was operated as a Title 14…NTSB ANC24LA020Accident · Minor injuriesClass 4 · LimitedFinal reportStinson 108 · Houston, AKA total loss of engine power due to fuel starvation and the pilot's mismanagement of the available fuel.NTSB ANC23LA051Accident · No injuriesClass 3 · LimitedFinal reportStinson 108 · Ninilchik, AKA partial loss of engine power due to failure of the No. 1 cylinder intake valve head.NTSB ANC21LA068Accident · No injuriesClass 3 · LimitedFinal reportStinson 108-1 · Sterling, AKInsufficient available power as a result of low compression in three engine cylinders. Contributing to the accident was the pilot’s decision to takeoff with a slight quartering tailwind.NTSB ANC12CA104Accident · No injuriesData collectionFinal reportStinson 108-2 · Nikiski, AKThe pilot's selection of an unsuitable landing surface, which resulted in a loss of control during the landing roll.NTSB ANC10CA051Accident · No injuriesData collectionFinal reportStinson 108-1 · Galena, AKThe pilot's failure to maintain directional control during takeoff, resulting in a ground-loop, and collapse of the right main landing gear.NTSB ANC10CA010Accident · No injuriesData collectionFinal reportStinson 108-1 · Selawik, AKThe pilot's failure to maintain a proper descent rate during landing, resulting in a hard landing.NTSB ANC03LA028Accident · No injuriesLimited investigationFinal reportStinson 108-1 · Sitka, AKThe pilot's failure to maintain directional control of the airplane during the landing roll, which resulted in an inadvertent ground loop, and the collapse of the right main landing gear.NTSB ANC98LA117Accident · No injuriesLimited investigationFinal reportStinson 108-1 · Delta Junction, AKThe pilot's selection of an unsuitable takeoff area. Factors associated with the accident were willow trees, and rising terrain.NTSB ANC97LA122Accident · No injuriesLimited investigationFinal reportStinson 108 · Fairbanks, AKThe pilot's inadequate compensation for wind conditions. A factor was the crosswind.NTSB ANC94LA108Accident · No injuriesLimited investigationFinal reportStinson 108 · Salcha, AKThe pilot did not maintain control of the airplane. A factor in the accident was the pilot's lack of total experience in the specific make/model/type of aircraft.NTSB ANC92LA059Accident · No injuriesLimited investigationFinal reportStinson 108-1 · Mccarthy, AKThe pilot's failure to maintain directional control of the airplane. Contributing to the accident were the snow berm and the pilot's lack of total experience in the type of operation (ski equipped airplanes).NTSB ANC90LA140Accident · No injuriesLimited investigationFinal reportStinson 108-1 · Fareweel, AKThe pilot's decision to takeoff downwind.NTSB ANC88LA126Accident · No injuriesLimited investigationFinal reportStinson 108 · Mt Spur, AKAt 1500 feet m.s.l. a complete engine failure occurred. An emergency landing was made on a gravel bar. During the rollout the airplane collided with a gravel bank. An on site examination of the engine revealed a hole in the case next to the left exhaust…NTSB ANC84LA015Accident · No injuriesLimited investigationFinal reportStinson 108 · Skwentna, AKAfter takeoff the eng lost 50% of its power & a forced landing was made in trees. The plt believed the eng failure was due to water/ice in fuel.NTSB ANC83LA117Accident · No injuriesLimited investigationFinal reportStinson 108-1 · Nenana, AKThe acft nose gear failed during a forced landing after the engine lost power during climbout. The plt rptd the engine began to run intermittently then quit completely. The acft had just been serviced with 36 gallons of 80/87 octane fuel. The student pilot…NTSB ANC83LA002Accident · No injuriesLimited investigationFinal reportRockwell International Stinson 108 · Near Sparrevohn, AKThe pilot stated that after shooting a moose in the morning, quartering the animal and carrying the meat to the an unimproved landing/takeoff area he walked back to his cabin for his aircraft. Upon his return, he landed and loaded 2 quarters into the back…NTSB ANC82DAG29Accident · Serious injuriesFinal reportStinson 181 · Talkeetna, AKThe pilot made a forced landing after a spark plug blew out of the engine. During the landing the aircraft collided with a tree.NTSB ANC77DAH01Accident · Serious injuriesClosedStinson 108 · Anchorage, AKNTSB ANC77DAG43Accident · No injuriesClosedStinson 108-1 · Twin Lakes, AKNTSB ANC77DAG27Accident · Minor injuriesClosedStinson 108-1 · Kenai, AKNTSB ANC76DAA34Accident · No injuriesClosedStinson 108-2 · Fairbanks, AKNTSB ANC76AAG71Accident · Minor injuriesClosedStinson 108 · Port Alsworth, AKNTSB ANC75DAG74Accident · No injuriesClosedStinson 108-1 · Iliamna, AKNTSB ANC75DAG69Accident · No injuriesClosedStinson 108-1 · Talkeetna, AKNTSB ANC75DAG06Accident · No injuriesClosedStinson 108-2 · Anchorage, AKNTSB ANC74FAG99Accident · No injuriesClosedStinson 108-1 · Cantwell, AKNTSB ANC74DAG88Accident · No injuriesClosedStinson 108 · Soldotna, AKNTSB ANC74DAG45Accident · No injuriesClosedStinson 108 · Aniak, AKNTSB ANC73DAA04Accident · No injuriesClosedStinson 108-2 · Mt Mckinley, AKNTSB ANC72DAG67Accident · No injuriesClosedStinson 108 · Anchorage, AKNTSB ANC71DAG53Accident · No injuriesClosedStinson 108-1 · Egegik, AKNTSB ANC70D0073Accident · No injuriesClosedStinson 108-1 · Delta Junctn, AKNTSB ANC69D0064Accident · No injuriesClosedStinson 108-1 · Fairbanks, AK