# NTSB investigations: Cessna 421C, CO

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 CEN24FA228](https://openairdocs.org/ntsb/CEN24FA228.md): Cessna 421 · Steamboat Springs, CO · Accident · 2 fatal · Class 3 · Field · Final report · Jun 17, 2024 · N245T · Destroyed
  > The pilot’s failure to maintain sufficient airspeed following a loss of engine power, which resulted in an inadvertent aerodynamic stall/spin at low altitude.
- [NTSB CEN21LA315](https://openairdocs.org/ntsb/CEN21LA315.md): Cessna 421C · Longmont, CO · Accident · Minor injuries · Class 3 · Limited · Final report · Jul 10, 2021 · N66NC · Substantial damage
  > The loss of performance for reasons that could not be determined.
- [NTSB DFW08LA115](https://openairdocs.org/ntsb/DFW08LA115.md): Cessna 421C · Sterling, CO · Accident · No injuries · Limited investigation · Final report · Apr 24, 2008 · N513FS · Substantial damage
  > Failure and separation of the upper and lower right main gear torque links links, which resulted in a loss of directional control on landing roll-out.
- [NTSB DEN91FA056](https://openairdocs.org/ntsb/DEN91FA056.md): Cessna 421C · Cortez, CO · Accident · 5 fatal · Field investigation · Final report · Mar 29, 1991 · N3851C · Destroyed
  > The pilot's improper IFR procedures. Factors were: the existing weather conditions and the pilot's failure to obtain a preflight briefing.
- [NTSB DEN90FA085](https://openairdocs.org/ntsb/DEN90FA085.md): Cessna 421-C · Boulder, CO · Accident · 2 fatal · Field investigation · Final report · Apr 1, 1990 · N2655V · Destroyed
  > A loss of airplane control as a result control interference by the passenger following a struggle between the pilot and the passenger.
- [NTSB DEN84MA247](https://openairdocs.org/ntsb/DEN84MA247.md): Cessna 421C · Fort Lupton, CO · Accident · 3 fatal · Major investigation · Final report · Aug 1, 1984 · N6231G · Destroyed
  > During a preflt wx briefing, the plt was advised of thunderstorms & intense rain showers on the route of flt. However, he filed an IFR flt plan & took off. During flt, the ATC controller advised the plt of a level 6 cell ahead & noted that he had no report on…
- [NTSB DEN84FA004](https://openairdocs.org/ntsb/DEN84FA004.md): Cessna 421C · Center, CO · Accident · No injuries · Field investigation · Final report · Oct 9, 1983 · N770JW · Substantial damage
  > The acft collided with a dirt bank after a left engine overspeed and loss of directional control during takeoff. The plthad already aborted one takeoff due to overboost and a sticking wastegate. The problem seemed corrected after work and lubrication by a…
- [NTSB DEN83LA081](https://openairdocs.org/ntsb/DEN83LA081.md): Cessna 421C · Gunnison, CO · Accident · No injuries · Limited investigation · Final report · Mar 18, 1983 · N67943 · Substantial damage
  > The plt began taking off on rwy 06 with a wind from 190 deg at 8 KTS. He stated that max power & RPM were obtained. He noted that he obtained 39 inches of manifold pressure & 2235 RPM at 100 KTS IAS. Reportedly, the acft rotated properly, but began to vibrate…
- [NTSB DEN80FTE71](https://openairdocs.org/ntsb/DEN80FTE71.md): Cessna 340 · Steamboat Spgs, CO · Accident · No injuries · Closed · Aug 15, 1980 · N764R · Substantial damage
- [NTSB DEN74FTE34](https://openairdocs.org/ntsb/DEN74FTE34.md): Cessna 421B · Aspen, CO · Accident · Minor injuries · Closed · Dec 29, 1973 · N421AT · Substantial damage

## 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" = 'CO' AND c."eventCountry" = 'USA'
  AND c."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.aircraft_model_code IN ('2076016', '2076017'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?model=2076016&state=CO

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