NTSB investigations: Enstrom F-28C

6 cases on aircraft the registry lists as Enstrom F-28C, where the first occurrence was “Loss of engine power(total) - mech failure/malf”. 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

19822026

NTSB investigations: Enstrom F-28C per year, 1982–2026: 6 cases
1982	1
1985	1
1990	1
1993	2
1997	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.aircraft_model_code IN ('3300407') 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" = 351)) 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.aircraft_model_code IN ('3300407')
      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\" = 351))
  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.aircraft_model_code IN ('3300407')
    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" = 351))
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 FTW97LA094Accident · No injuriesLimited investigationFinal reportEnstrom F-28C · Lake Jackson, TXThe failure of the #2 cylinder for an undetermined reason which resulted in an exhaust leak that melted an oil line.Jan 30, 1997 · N51774 · Destroyed NTSB SEA93FA178Accident · No injuriesField investigationFinal reportEnstrom F-28C · Seattle, WAShorted magneto condensers. Factors include a hidden obstruction in the landing area, and a reduction in rotor RPM from attempting to avoid the obstruction.Aug 18, 1993 · N86198 · Substantial damage NTSB CHI93LA212Accident · Serious injuriesLimited investigationFinal reportEnstrom F-28C · Buckner, MOThe nut backing off the connecting rod bolt resulting in rod failure. A factor involved in this accident was the lack of suitable terrain for the pilot in command to make a run on landing.Jun 14, 1993 · N51717 · Substantial damage NTSB SEA90LA116Accident · No injuriesLimited investigationFinal reportEnstrom F28C · Camas, WAThe failure of a sprag clutch in the rotor-drive mechanism, at an altitude and position that precluded or limited the possibility of a successful outcome.Jun 7, 1990 · N51729 · Substantial damage NTSB DEN85LA094Accident · No injuriesLimited investigationFinal reportEnstrom F-28L · Salt Lake City, UTThe acft eng lost pwr on final apch at aprx 100 ft AGL. The tail boom was severed during the autorotational landing on soft ground. Post accident exam of the eng revealed that the left magneto point gap was excessively closed. During eng test run, when the…Mar 14, 1985 · N51671 · Substantial damage NTSB DEN82DA089Accident · No injuriesFinal reportEnstrom F-28C · Marmath, NDThe pilot reported that while he was in flight at about 75 to 80 ft AGL, the engine lost power. During an autorotative landing in an open pasture, a skid dug into the ground and the helicopter rolled over. A subsequent engine teardown revealed evidence that…May 17, 1982 · N8617J · Substantial damage