NTSB Identification: ATL83FA008
14 CFR Part 91: General Aviation
Accident occurred Saturday, October 09, 1982 in MONTGOMERY, AL
Probable Cause Approval Date: 10/09/1983
Aircraft: CESSNA 177RG, registration: N45696
Injuries: 1 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.

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.

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

PROPELLER SYSTEM/ACCESSORIES,BLADE..FATIGUE

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

PROPELLER SYSTEM/ACCESSORIES,BLADE..FAILURE,TOTAL

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

PROPELLER SYSTEM/ACCESSORIES,BLADE..SEPARATION

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