PLYMOUTH, FL, USA
N12840
CESSNA 172M
AFTER A NORMAL LNDG, DURING THE LNDG ROLL AT APRX 50-55 MPH, THE ACFT ROLLED THROUGH A 1-2' DEEP PUDDLE OF WATER. THE ACFT SLOWED & AT APRX 35 MPH, THE RT MAIN LNDG GEAR SLOWLY BEGAN ROTATING AFT. THE ACFT CAME TO REST SUPPORTED BY THE RT HORIZONTAL STABILIZER & THE NOSE & LEFT MAIN LNDG GEAR. EXAMINATION OF THE FAILED GEAR REVEALED THE ATTACH BOLT FOR THE GEAR SPRING ASSY FAILED, ALLOWING THE GEAR TO ROTATE AFT. EXAMINATION OF THE BOLT REVEALED IT FAILED DUE TO EXCESS SHEAR LOADS PLACED ON IT DURING TORSIONAL LOADING OF THE UPPER END OF THE LNDG GEAR TUBE. THE BOLT ALSO SHOWED EVIDENCE OF FRETTING. HARDNESS TESTS PERFORMED REVEALED THE BOLT WAS WITHIN SPECIFICATIONS.
Source: NTSB Aviation Accident Database
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