# NTSB CHI82FA059: Cessna 404, N6761H, Oshkosh, WI, February 19, 1982

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Field investigation · Final report
- Date: February 19, 1982, 13:00 local (19:00 UTC)
- Place: Oshkosh, WI
- Location: 43.9844° N, 88.5570° W: Placed by OpenAirDocs at WITTMAN RGNL (OSH), within about a mile (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=43.9844&lon=-88.5570&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 7 uninjured
- Status: Completed, report February 19, 1983
- Report: Approved by Office Director
- NTSB case key (mKey): 72115
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI82FA059
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/72115/pdf
- Page: https://openairdocs.org/ntsb/CHI82FA059

## Sequence of events

In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf).

- Main gear collapsed, landing - roll
  - landing gear,main gear - asymmetrical (cause)
  - landing gear,main gear - improper (cause)
  - landing gear,main gear - failure,partial (cause)
  - landing gear,main gear - disconnected (cause)
  - aircraft/equipment inadequate, manufacturer (cause)

## Analysis

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 EXTENSION OF THE REAR PIVOT PIN ON THE LEFT GEAR WAS MEASURED AT 1/2 INCH OF PAINTED PIN EXTENDING INTO THE FLAP TRACK AREA. THE PIVOT PIN IS HELD IN THE TRUNNION WITH A ROLL PIN. THE AFT PIN STILL HAD A SECTION OF THE ROLL PIN IN IT & THE FAILURE MODE WAS A SHEAR. THE OTHER TWO SMALL PIECES OF THE ROLL PIN WERE STILL IN THE TRUNNION. THE FORWARD PIVOT PIN SHOWED A WEAR PATTERN THAT THE SHIMS HAD BEEN RIDING ABOUT 2/10 INCH FURTHER FROM THE PIVOT PIN HOLE THAN ON THE REAR PIN. ADDITIONALLY, THE REAR PIN HAD GROOVED WEAR MARKS ALL THE WAY TO THE END OF THE PIVOT PIN FROM THE POINT OF ORIGINAL WEAR PATTERN.

## Aircraft

- Registration: [N6761H](https://openairdocs.org/deregistered/N6761H-1986-03-28), registration cancelled 1986-03-28, S/N 404-0670 (OpenAirDocs)
- Reported make and model: CESSNA 404
- Registry model: [Cessna 404](https://openairdocs.org/model/cessna-404) (registry code 2075901) (OpenAirDocs)
- Category: Airplane
- Serial number: 404-0670
- Airframe hours: 282
- Engines: CONTINENTAL GTSIO-520-M 375 horsepower reciprocating
- Damage: Substantial damage
- Flight: Part 135
- Operator: Priester Aviation Service
- Registered owner: Priester Aviation Service
- Departed: ATW, APPLETON, WI
- Destination: 3GV, GRAIN VALLEY, MO
- Flight plan: IFR
- Airport: OSH, Wittman, runway 36, 6,700 × 150 ft, concrete

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 52; flight instructor, commercial; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; flight hours: 9,373 total, 99 in this make and model, 9,110 as pilot in command, 72 in the last 90 days, 5 in the last 24 hours

## Weather

- Conditions: Instrument (IMC), Day
- Wind: 270° at 10 knots
- Visibility: 4 statute miles
- Lowest ceiling: 800 ft overcast
- Altimeter: 29.00 inHg
- Observed at: OSH

## FAA reports on this event (1)

The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs).

- [Accident 19820219004859A](https://openairdocs.org/incident/19820219004859A), Feb 19, 1982: Cessna 404CESSNA, Oshkosh, WI, Substantial damage. Rear pivot pin PN57411121 moved aft out of trunnion allowing right gear to collapse during landing roll.

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

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