# NTSB investigations, 1998: Propeller 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 FTW98FA392](https://openairdocs.org/ntsb/FTW98FA392.md): Piper PA-20-180 · Thornton, CO · Accident · Serious injuries · Field investigation · Final report · Sep 19, 1998 · N6028D · Destroyed
  > The separation of a propeller blade due to corrosion initiated fatigue, followed by the separation of several of the engine's mounts, and the subsequent inability of the pilot to control the aircraft. A contributing factor was the trees.
- [NTSB ANC98LA131](https://openairdocs.org/ntsb/ANC98LA131.md): Cessna 172 · Palmer, AK · Accident · No injuries · Limited investigation · Final report · Aug 15, 1998 · N7966B · Substantial damage
  > Fatigue of the forward end of the engine crankshaft resulting in separation of the propeller assembly, and the operator's failure to comply with a required maintenance procedure. A factor was uneven terrain.
- [NTSB ATL98LA108](https://openairdocs.org/ntsb/ATL98LA108.md): Dean R. Fellows Vans RV-6 · Bainbridge, GA · Accident · Serious injuries · Limited investigation · Final report · Aug 8, 1998 · N245DF · Substantial damage
  > The pilot's failure to properly modify the crankshaft per the manufacturers service instructions for installation of a fixed pitch propeller and to apply proper torque values to the propellers mounting bolts.
- [NTSB FTW99LA025](https://openairdocs.org/ntsb/FTW99LA025.md): Mooney M20C · Vernon, TX · Accident · No injuries · Limited investigation · Final report · Jul 27, 1998 · N9744M · Substantial damage
  > Fatigue cracking of the propeller blade which originated from corrosion pitting on its camber side, resulting in the blade tip separation during cruise flight.
- [NTSB NYC98IA106](https://openairdocs.org/ntsb/NYC98IA106.md): Beech 1900D · Syracuse, NY · Incident · No injuries · Incident investigation · Final report · May 4, 1998 · N832CA · Minor damage
  > Improper maintenance which resulted in a cross threaded\ mistapped counterweight bolt hole, and the subsequent failure of the propeller counterweight clamp assembly. Also causal was the inadequate inspection of the counterweight clamp threads by maintenance…

## 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 year(c."eventDate") = 1998
  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" = 131)
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?occurrence=131&year=1998

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