# NTSB investigations: Cessna 421C: Airframe/component/system 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 CHI07CA152](https://openairdocs.org/ntsb/CHI07CA152.md): Cessna 421C · Kokomo, IN · Accident · No injuries · Data collection · Final report · May 22, 2007 · N85SC · Substantial damage
  > The pilot not obtaining proper alignment with the runway during the emergency landing after takeoff, which imparted an excessive side load on the landing gear. Factors contributing to the accident were the unstabilized approach and engine shutdown due to the…
- [NTSB CHI06LA080](https://openairdocs.org/ntsb/CHI06LA080.md): Cessna 421C · Indianapolis, IN · Accident · No injuries · Limited investigation · Final report · Feb 18, 2006 · N98507 · Substantial damage
  > The main landing gear malfunctioned and failed to extend during the landing approach for an undetermined reason, which resulted in a main gear up landing.
- [NTSB LAX03LA106](https://openairdocs.org/ntsb/LAX03LA106.md): Cessna 421C · Crescent City, CA · Accident · No injuries · Limited investigation · Final report · Mar 5, 2003 · N26533 · Substantial damage
  > The separation of the upper and lower right main landing gear scissor links due to improper maintenance, which resulted in a ground loop, and the collapse of the right main landing gear during the landing roll.
- [NTSB MIA02LA089](https://openairdocs.org/ntsb/MIA02LA089.md): Cessna 421C · Tampa, FL · Accident · No injuries · Limited investigation · Final report · Apr 25, 2002 · N237SM · Substantial damage
  > the fracture of the landing gear upper barrel due to fatigue cracking, caused by improper machining after the barrel was assembled during the manufacturing process, resulting in damage to the airplane.
- [NTSB SEA02LA046](https://openairdocs.org/ntsb/SEA02LA046.md): Cessna 421C · Hailey, ID · Accident · No injuries · Limited investigation · Final report · Mar 2, 2002 · N421DG · Substantial damage
  > Water contamination within the aircraft's landing gear hydraulic line(s) which froze and blocked the line(s) preventing extension of the right main gear. A factor was the below freezing environmental conditions which the aircraft was operating in prior to and…
- [NTSB FTW99LA059](https://openairdocs.org/ntsb/FTW99LA059.md): Cessna 421C · Shelbyville, TX · Accident · Minor injuries · Limited investigation · Final report · Jan 1, 1999 · N234CG · Substantial damage
  > The total failure of the aircraft's electrical system. Factors were the thunderstorms, the dusk light condition, and the lack of suitable terrain for the precautionary landing.
- [NTSB SEA97LA058](https://openairdocs.org/ntsb/SEA97LA058.md): Cessna 421C · Cedar City, UT · Accident · No injuries · Limited investigation · Final report · Feb 6, 1997 · N45MV · Substantial damage
  > water contamination in the hydraulic system, which froze in the (right) main gear hydraulic actuator, and restricted movement of the (right) main gear retraction and extension system.
- [NTSB CHI94MA072](https://openairdocs.org/ntsb/CHI94MA072.md): Cessna 421C · Mccook, NE · Accident · 2 fatal · Major investigation · Final report · Jan 26, 1994 · N5468G · Destroyed
  > Improper in-flight planning/decision by the pilot, and the accumulation of airframe ice, which resulted in an inadvertent stall. Factors associated with the accident were: partial failure of both alternators, which resulted in a subsequent electrical system…
- [NTSB MIA94FA057](https://openairdocs.org/ntsb/MIA94FA057.md): Cessna 421C · Titusville, FL · Accident · 3 fatal · Field investigation · Final report · Jan 21, 1994 · N777BE · Destroyed
  > Failure of the pilot-in-command to maintain VMC resulting in the inflight loss of control. Contributing to the accident was the fatigue failure of a section of pipe adjacent to a flange which connects to the turbocharger oil outlet of the left engine assembly.
- [NTSB LAX93FA149](https://openairdocs.org/ntsb/LAX93FA149.md): Cessna 421C · Eagle Mountain, CA · Accident · 3 fatal · Field investigation · Final report · Mar 12, 1993 · N2656N · Destroyed
  > Failure of the left elevator for undetermined reason(s), which resulted in flutter and failure of the empennage, and subsequent uncontrolled collision with the terrain.

## 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_occurrences.parquet' o WHERE o.case_mkey = x.case_mkey AND o.aircrafts_position = x.position AND o."occurrenceNumber" = 1 AND o."occurrenceCode" = 130))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?model=2076016&occurrence=130

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