NTSB investigations: Lycoming VO-435 series

8 cases on aircraft whose registry engine model is Lycoming VO-435 series, where the first occurrence was “Hard landing”. 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

19832026

NTSB investigations: Lycoming VO-435 series per year, 1983–2026: 8 cases
1983	1
1984	1
1987	1
1990	1
1993	1
1994	1
1996	1
2004	1

Where

Open the map

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."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('41525') AND EXISTS (SELECT 1 FROM 'https://openairdocs.org/data/latest/ntsb_occurrences.parquet' o WHERE o.case_mkey = x.case_mkey AND o.aircrafts_position = x.position AND o."occurrenceNumber" = 1 AND o."occurrenceCode" = 200)) 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.\"mKey\" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('41525')
      AND EXISTS (SELECT 1 FROM 'https://openairdocs.org/data/latest/ntsb_occurrences.parquet' o WHERE o.case_mkey = x.case_mkey AND o.aircrafts_position = x.position AND o.\"occurrenceNumber\" = 1 AND o.\"occurrenceCode\" = 200))
  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."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('41525')
    AND EXISTS (SELECT 1 FROM 'https://openairdocs.org/data/latest/ntsb_occurrences.parquet' o WHERE o.case_mkey = x.case_mkey AND o.aircrafts_position = x.position AND o."occurrenceNumber" = 1 AND o."occurrenceCode" = 200))
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 FTW04CA207Accident · No injuriesData collectionFinal reportBell 47G-3B-1 · Troy, TXThe flight instructor's improper flare, resulting in a hard landing. A contributing factor was the high density altitude.Aug 5, 2004 · N47713 · Substantial damage NTSB LAX96LA326Accident · No injuriesLimited investigationFinal reportBell 47-G5 · Riverside, CAThe pilot's inaccurate perception of altitude which resulted in an improper flare and subsequent hard landing, and non use of the landing light.Aug 30, 1996 · N57RA · Substantial damage NTSB CHI94LA133Accident · No injuriesLimited investigationFinal reportBell 47-62 · Aurora, MOThe dual students inadequate flare and the pilot in command's (flight instructor) delayed remedial action.Mar 5, 1994 · N6711D · Substantial damage NTSB CHI93LA320Accident · Minor injuriesLimited investigationFinal reportBell 47-G5 · Schaumburg, ILthe pilot's improper autorotation techniques.Aug 12, 1993 · N1347X · Substantial damage NTSB CHI90LA205Accident · No injuriesLimited investigationFinal reportBell 47G-5 · Hudson, IAImproper touchdown performed by the pilot in command.Jul 30, 1990 · N8140J · Substantial damage NTSB ATL87LA249Accident · No injuriesLimited investigationFinal reportBell 47G3B1 · Enterprise, ALDuring a practice autorotation, the instructor pilot delayed in appling power to arrest the autorotative descent. The other pilot reported that the autorotation profile was was not the same as the previous successful autorotation. There were no reported…Sep 6, 1987 · N38CD · Substantial damage NTSB LAX84LA462Accident · No injuriesLimited investigationFinal reportBell 47G-2 · El Cajon, CAThe helicopter made a hard landing during a test flt. The plt reported that the collective was very stiff and he was notable to stop the descent during landing. FAA inspected the helicopter after the accident and found no discrepancies in the control system…Aug 29, 1984 · N18807 · Substantial damage NTSB ANC83LA035Accident · Minor injuriesLimited investigationFinal reportBell 47G-2 · Anchorage, AKThe helicopter made a landing during which the tail boom was severed. This was a dual instructional flight and accordingto the instructor, a high reconnaissance was performed before selecting their approach to the pinnacle. The pinnacle is a 3000 foot landing…Jan 19, 1983 · N2822B · Substantial damage