MONTGOMERY, AL, USA
N45696
CESSNA 177RG
AFTER ADVANCING THE THROTTLE ABOUT 1/2 OF ITS TRAVEL TO COMMENCE THE TAKEOFF ROLL, THE PLT HEARD A LOUD EXPLOSION & FELT A VIOLENT SHAKING OF THE ACFT. THE ENG QUIT & THE ACFT SWERVED TO THE RIGHT SIDE OF THE RWY. POST CRASH EXAMINATIONREVEALED THAT ONE ENTIRE PROPELLER BLADE HAD BEEN THROWN FROM THE PROPELLER HUB. THE FATIGUE FAILURE ORIGINATED AT A LOCATION ACROSS THE HUB FROM THE OPEN AREA & PROPOGATED OVER APPROXIMATELY 80% OF THE SURFACE BEFORE BREAKING AWAY IN OVERLOAD. THE FATIGUE ORIGINATED FROM AN AREA OF A METAL DEFECT IN THE FORM OF OVERHEATED MELTED MATERIAL. A DISCOLORED IRREGULAR AREA EXISTED ALONG THE OUTER RADIUS OF THE ORIGIN AREA, & DETAILED EXAMINATION OF THIS AREA DISCLOSED SPHERICAL PORES & STRUCTURE INDICATIVE OF FUSED METAL. THE FATIGUE STRIATIONS EMANATED FROM THE BASE OF THE POROUS & FUSED ZONE. A SPECIFIC CAUSE OF THE DEFECT WAS NOT IDENTIFIED.
Source: NTSB Aviation Accident Database
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