NTSB Identification: CHI82FA059
Nonscheduled 14 CFR Part 135: Air Taxi & Commuter
Accident occurred Friday, February 19, 1982 in OSHKOSH, WI
Probable Cause Approval Date: 02/19/1983
Aircraft: CESSNA 404, registration: N6761H
Injuries: 7 Uninjured.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

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.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

LANDING GEAR,MAIN GEAR..ASYMMETRICAL

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

LANDING GEAR,MAIN GEAR..IMPROPER

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

LANDING GEAR,MAIN GEAR..FAILURE,PARTIAL

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

LANDING GEAR,MAIN GEAR..DISCONNECTED

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

AIRCRAFT/EQUIPMENT INADEQUATE..MANUFACTURER

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