Accident Air Tractor AT-301 N4333S, Thursday 10 September 1992

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Date:	Thursday 10 September 1992
Time:	19:30 LT
Type:	Air Tractor AT-301
Owner/operator:	Private
Registration:	N4333S
MSN:	301-0012
Year of manufacture:	1975
Total airframe hrs:	6059 hours
Engine model:	P&W R-1340-AN1
Fatalities:	Fatalities: 0 / Occupants: 1
Other fatalities:	0
Aircraft damage:	Substantial
Category:	Accident
Location:	Satartia, MS - United States of America
Phase:	Landing
Nature:	Agricultural
Departure airport:	(NONE)
Destination airport:
Investigating agency:	NTSB
Confidence Rating:	Accident investigation report completed and information captured

Narrative:
DURING THE LANDING ROLL WITH THE BRAKES APPLIED, THE ACFT VEERED OFF THE LT SIDE OF THE GRASS AIRSTRIP & COLLIDED WITH A TELEPHONE POLE. EXAM OF THE ACFT REVEALED THAT THE RT BRAKE LINE WHICH WAS ATTACHED TO THE PARKING BRAKE ASSY WAS SEPARATED. EXAM OF THE LINE REVEALED THAT A BOGUS PART WAS INSTALLED RESULTING IN THE SEPARATION. NO DETERMINATION COULD BE MADE WHO PERFORMED THE IMPROPER REPAIR.

Probable Cause: FAILURE OF THE BRAKE SYSTEM DUE TO INSTALLATION OF A BOGUS PART BY AN UNKNOWN PERSON. DIRECTIONAL CONTROL BY THE PILOT IN COMMAND WAS NOT POSSIBLE.

Accident investigation: