# NTSB investigations, WI: Main gear collapsed

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 CHI07LA159](https://openairdocs.org/ntsb/CHI07LA159.md): Cessna 340A · Middleton, WI · Accident · No injuries · Limited investigation · Final report · May 30, 2007 · N17MH · Substantial damage
  > Failure of the right main landing gear extension and retraction linkage, which allowed the gear assembly to collapse during landing rollout. An additional cause was the improper adjustment procedure(s) by undetermined mechanic(s). The runway lights struck…
- [NTSB CHI04IA178](https://openairdocs.org/ntsb/CHI04IA178.md): Beech 1900D · Milwaukee, WI · Incident · No injuries · Incident investigation · Final report · Jul 6, 2004 · N87SK · Minor damage
  > The fatigue fracture of the left main landing gear during landing roll.
- [NTSB CHI93LA040](https://openairdocs.org/ntsb/CHI93LA040.md): Cessna 401B · Rice Lake, WI · Accident · No injuries · Limited investigation · Final report · Nov 27, 1992 · N7989Q · Substantial damage
  > Improper rigging of the right main landing gear retract bellcrank by other maintenance personnel.
- [NTSB CHI91LA157](https://openairdocs.org/ntsb/CHI91LA157.md): Piper PA-34-220T · Eau Claire, WI · Accident · No injuries · Limited investigation · Final report · May 14, 1991 · N8356B · Substantial damage
  > The inadequate finishing procedures used by the manufacturer and the failure to comply with the manufacturer's bulletin.
- [NTSB CHI91LA076](https://openairdocs.org/ntsb/CHI91LA076.md): Cessna 320 · Middleton, WI · Accident · No injuries · Limited investigation · Final report · Jan 24, 1991 · N4112T · Substantial damage
  > The main landing gear collapsed during landing rollout due to extreme cold temperatures. A factor related to the accident was a snowbank adjacent to the runway.
- [NTSB CHI86LA085](https://openairdocs.org/ntsb/CHI86LA085.md): Cessna 401B · Milwaukee, WI · Accident · No injuries · Limited investigation · Final report · Feb 9, 1986 · N777CS · Substantial damage
  > While taxiing to park, the left main landing gear collapsed. Investigation revealed that the left hand gear support had torn from the wing rib to which it was bolted. On the FAA malfunction or defect report submitted by the operator, company officials stated…
- [NTSB CHI84LA128](https://openairdocs.org/ntsb/CHI84LA128.md): Cessna 421B · Madison, WI · Accident · No injuries · Limited investigation · Final report · Mar 10, 1984 · N41022 · Substantial damage
  > The acft went off the rwy to the left during landing. There was a crosswind of 15-28 KTS at the time. The plt said the acft veered left and could not be controlled. After the accident the was 464P-26 bolt and 5133-4032 spacer were sheared off both the left…
- [NTSB CHI82FA059](https://openairdocs.org/ntsb/CHI82FA059.md): Cessna 404 · Oshkosh, WI · Accident · No injuries · Field investigation · Final report · Feb 19, 1982 · N6761H · Substantial damage
  > The right main gear collapsed on landing. Investigation revealed that the rear trunnion pivot pin, P/N5741112-1, had moved aft & out of the trunnion. The pin had about 1 inch of white paint on the end of the pin that extended into the flap track area. The…

## 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" = 'WI' 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" = 191)
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?occurrence=191&state=WI

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.