Accident Cessna 177RG N45696, Saturday 9 October 1982

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Date:	Saturday 9 October 1982
Time:	12:20 LT
Type:	Cessna 177RG
Owner/operator:	Harvey Monk
Registration:	N45696
MSN:	177RG1127
Year of manufacture:	1977
Total airframe hrs:	2081 hours
Engine model:	Lycoming IO-360-A1B60
Fatalities:	Fatalities: 0 / Occupants: 1
Other fatalities:	0
Aircraft damage:	Substantial
Category:	Accident
Location:	Montgomery, AL - United States of America
Phase:	Take off
Nature:	Private
Departure airport:	Montgomery, AL
Destination airport:	Montgomery, AL
Investigating agency:	NTSB
Confidence Rating:	Accident investigation report completed and information captured

Narrative:
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.

Probable Cause:

Accident investigation: