Accident Air Tractor AT-301 N5078S, Saturday 8 June 1985

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Date:	Saturday 8 June 1985
Time:	18:00 LT
Type:	Air Tractor AT-301
Owner/operator:	Jackie Frost
Registration:	N5078S
MSN:	AT301-0115
Total airframe hrs:	2000 hours
Engine model:	P&W R-1340 AN1
Fatalities:	Fatalities: 0 / Occupants: 1
Other fatalities:	0
Aircraft damage:	Substantial
Category:	Accident
Location:	Marianna, AR - United States of America
Phase:	Manoeuvring (airshow, firefighting, ag.ops.)
Nature:	Agricultural
Departure airport:	Marianna, AR (6M7)
Destination airport:
Investigating agency:	NTSB
Confidence Rating:	Accident investigation report completed and information captured

Narrative:
AFTER DEPARTING THE AG STRIP THE PLT RPTD A VIBRATING ENGINE WHICH SHOOK VIOLENTLY UNTIL FINALLY QUITTING. THE PLT RESPONDED WITH AN EMERGENCY LANDING ATTEMPT TO A PLOWED BEAN FIELD. THE ACFT IMPACTED THE SOFT TERRAIN AT A HIGH RATE OF SPEED WHERE THE ACFT FLIPPED OVER INVERTED. THEACFT COMMENCED TO BURN AFTER IMPACT, WHICH TOTALLY CONSUMED THE ACFT STRUCTURE. INSPECTION OF THE ACFT ENGINE FOUND A BROKEN NUMBER ONE CYLINDER CONNECTION ROD.

Probable Cause:

Accident investigation: