NTSB Identification: MIA88LA235.
The docket is stored on NTSB microfiche number 37471.
Accident occurred Saturday, July 23, 1988 in PLYMOUTH, FL
Probable Cause Approval Date: 09/11/1989
Aircraft: CESSNA 172M, registration: N12840
Injuries: 2 Uninjured.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

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.

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

LANDING GEAR,MAIN GEAR ATTACHMENT..SHEARED

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

LANDING GEAR,MAIN GEAR ATTACHMENT..PREVIOUS DAMAGE


Contributing Factors

LANDING GEAR,MAIN GEAR ATTACHMENT..LOOSE

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