# NTSB investigations: Cessna 421C: Landing gear collapse

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 ERA18LA154](https://openairdocs.org/ntsb/ERA18LA154.md): Cessna 421 · Sandersville, GA · Accident · No injuries · Class 3 · Limited · Final report · May 21, 2018 · N427JM · Substantial damage
  > A nose landing gear collapse for reasons that could not be determined based on the available information.
- [NTSB WPR17LA051](https://openairdocs.org/ntsb/WPR17LA051.md): Cessna 421C · Jackson, CA · Accident · No injuries · Limited investigation · Final report · Jan 7, 2017 · N71RC · Substantial damage
  > The failure of the right main landing gear torque link bolt in overstress, which resulted in the collapse of the landing gear during the landing roll.
- [NTSB WPR16LA092](https://openairdocs.org/ntsb/WPR16LA092.md): Cessna 421C · Death Valley, CA · Accident · No injuries · Limited investigation · Final report · Apr 13, 2016 · N21SG · Substantial damage
  > A runway overrun for reasons that could not be determined based on the available information.
- [NTSB CEN13LA208](https://openairdocs.org/ntsb/CEN13LA208.md): Cessna 421C · Amarillo, TX · Accident · No injuries · Limited investigation · Final report · Mar 27, 2013 · N805DC · Substantial damage
  > Maintenance personnel's failure to detect the misadjustment of the left landing gear actuator's switch after recent maintenance, which prevented the landing gear from locking in the extended position and resulted in the landing gear collapsing during landing.
- [NTSB CEN12CA644](https://openairdocs.org/ntsb/CEN12CA644.md): Cessna 421C · Kenedy, TX · Accident · No injuries · Data collection · Final report · Sep 11, 2012 · N5534G · Substantial damage
  > The pilot’s improper flare, which resulted in a hard landing and subsequent collapse of the landing gear.
- [NTSB WPR09LA029](https://openairdocs.org/ntsb/WPR09LA029.md): Cessna 421C · Mesa, AZ · Accident · No injuries · Limited investigation · Final report · Oct 30, 2008 · N421PC · Substantial damage
  > The failure of the hydraulic landing gear extension systems due to a ruptured line.
- [NTSB NYC08LA204](https://openairdocs.org/ntsb/NYC08LA204.md): Cessna 421C · Greenville, NC · Accident · Minor injuries · Limited investigation · Final report · Jun 2, 2008 · N49DD · Substantial damage
  > The malfunction and premature retraction of the landing gear for undetermined reasons.

## 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.aircraft_model_code IN ('2076016', '2076017')
    AND EXISTS (SELECT 1 FROM 'https://openairdocs.org/data/latest/ntsb_events.parquet' s WHERE s.case_mkey = x.case_mkey AND s.aircrafts_position = x.position AND s."tier2Number" = '094' AND s.case_mkey IN (SELECT case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_events.parquet' WHERE "isDefiningEvent")))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb-events/094/sequence?model=2076016

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