# NTSB investigations, MI: Rotor failure/malfunction

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 CHI03LA006](https://openairdocs.org/ntsb/CHI03LA006.md): Wolf Rotorway Exec-162F · Gregory, MI · Accident · No injuries · Limited investigation · Final report · Oct 7, 2002 · N1955Z · Substantial damage
  > Failure of the secondary drive shaft, which resulted in a complete loss of power to the main rotor, and a high forward airspeed on touchdown, causing the helicopter to flip forward.
- [NTSB CHI01LA162](https://openairdocs.org/ntsb/CHI01LA162.md): Giackino Exec 162F · Manistique, MI · Accident · No injuries · Limited investigation · Final report · Jun 12, 2001 · N556DG · Substantial damage
  > The contamination of the main rotor drive belts causing them to slip. Factors were the low altitude, unsuitable terrain for the forced landing, and the water.
- [NTSB CHI98FA313](https://openairdocs.org/ntsb/CHI98FA313.md): Hiller FH-1100 · Dewitt, MI · Accident · 1 fatal · Field investigation · Final report · Aug 14, 1998 · N8171U · Destroyed
  > The rotor failure/malfunction due to debonding of the tail rotor blade. Also causal was the inadequate maintenance inspection of the aircraft by the company and the improper maintenance procedure by other maintenance personnel.
- [NTSB CHI95FA320](https://openairdocs.org/ntsb/CHI95FA320.md): Bell 230 · Ann Arbor, MI · Accident · No injuries · Field investigation · Final report · Sep 9, 1995 · N232UM · Substantial damage
  > the manufacturer's inadequate quality control which led to a fatigue failure of the tail rotor blade.

## 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."eventStateOrRegion" = 'MI' AND c."eventCountry" = 'USA'
  AND c."mKey" IN (SELECT o.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_occurrences.parquet' o WHERE o."occurrenceNumber" = 1 AND o."occurrenceCode" = 132)
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?occurrence=132&state=MI

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