# NTSB investigations: Lycoming TVO-435-GIA: Hard landing

NTSB aviation accident and incident investigations since 1962: the probable cause, findings, aircraft, crew, weather and docket of each, linked to the FAA registry and the FAA’s own reports.

## Latest cases

- [NTSB FTW97LA319](https://openairdocs.org/ntsb/FTW97LA319.md): Bell 47G-3B-2 · Montrose, CO · Accident · No injuries · Limited investigation · Final report · Aug 19, 1997 · N2243W · Substantial damage
  > failure of the flight instructor (CFI) to properly supervise the flight and ensure that adequate rotor rpm was maintainted during the autorotation/landing. The high density altitude was a related factor.
- [NTSB SEA94LA042](https://openairdocs.org/ntsb/SEA94LA042.md): Bell 47G3B1 · Mesa, WA · Accident · No injuries · Limited investigation · Final report · Nov 15, 1993 · N1181W · Substantial damage
  > The pilot's improper flare. Factors include excessive airspeed while approaching the flare.
- [NTSB LAX93LA209](https://openairdocs.org/ntsb/LAX93LA209.md): Bell 47-G2 · Antarctica · Accident · No injuries · Limited investigation · Final report · Apr 28, 1993 · N1437 · Substantial damage
  > The pilot's poorly planned approach.
- [NTSB DEN87LA019](https://openairdocs.org/ntsb/DEN87LA019.md): Bell 47G-3B-1 · Goshen, UT · Accident · No injuries · Limited investigation · Final report · Nov 10, 1986 · N47042 · Substantial damage
  > The plt was practicing power recovery autorotations then attempted one power off, full stop. The plt allowed the main rotor RPM to decay during approach and took no corrective action. The acft landed hard with slight forward motion and the plt applied aft…
- [NTSB SEA85LA174](https://openairdocs.org/ntsb/SEA85LA174.md): Bell 47G-3B-1 · Lebanon, OR · Accident · No injuries · Limited investigation · Final report · Jul 19, 1985 · N9417A · Substantial damage
  > The plt stated he performed 4 circling approaches over a sand bar and on the 5th approcah, rotor RPM decayed. Unable to regain the RPM, a hard landing resulted during which the main rotor blades severed the tailrotor.

## The whole list in SQL

Runs in DuckDB 1.2 or later on the release's Parquet files over HTTPS:

```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 ('41526')
    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
```

This list as a web page: https://openairdocs.org/ntsb?engine=41526&occurrence=200

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