NTSB Identification: MIA88FA178.
The docket is stored on NTSB microfiche number 37585.
Accident occurred Wednesday, May 25, 1988 in MARIANNA, FL
Probable Cause Approval Date: 09/25/1989
Aircraft: ROCKWELL A9B, registration: N7787V
Injuries: 1 Serious.

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 ACFT SUSTAINED A COMPLETE & SUDDEN POWER LOSS WHILE ENGAGED IN AG OPERATIONS AT LOW ALT. THE PROP, FWD PORTION OF THE CRANKSHAFT, CYL HEAD & OTHER ENG PARTS SEPARATED FROM THE ACFT. THE ACFT STRUCK A ROW OF 40 FT TREES & CRASHED TO THE GRND. AN EXAM OF THE FAILED CRANKSHAFT REVEALED THAT IT HAD SEPARATED JUST FWD OF THE NO. 2 MAIN BEARING. LAB ANALYSIS REVEALED EVIDENCE TO SUGGEST THE CRANKSHAFT FAILED DUE TO FATIGUE. THE OWNER OF THE ACFT STATED THE ENG HAD BEEN OVERHAULED IN THE PAST BUT HE DID NOT KNOW WHEN OR BY WHOM. ENG LOGBOOK ENTRIES DID NOT REFLECT ANY ENG OVERHAUL.

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

ENGINE ASSEMBLY,CRANKSHAFT..FAILURE,TOTAL

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

OBJECT..TREE(S)

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

ENGINE ASSEMBLY,CRANKSHAFT..FATIGUE

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