NTSB Identification: DEN83LA036
Scheduled 14 CFR Part 135: Air Taxi & Commuter
Accident occurred Monday, December 20, 1982 in GILLETTE, WY
Probable Cause Approval Date: 12/20/1983
Aircraft: SWEARINGEN SA-227AC, registration: N2671V
Injuries: 5 Uninjured.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

DIRECTIONAL CONTROL WAS LOST IN THE EARLY STAGE OF THE TAKEOFF ROLL. THE ACFT DEPARTED THE RWY 400 FT DOWN THE RWY & TRAVELLED 85 FT OFF THE SIDE OF THE RWY. ONE RWY LIGHT WAS DESTROYED. THE ACFT HAD COME FROM THE FACTORY EQUIPPED WITH AN ANTI-SKID BRAKE SYSTEM. THE SYSTEM WAS REPLACED WITH A STANDARD BRAKING SYSTEM PRIOR TO THE ACFT'S FIRST PASSENGER FLT. DURING THIS PROCESS HYDRAULIC LINES ATTACHED TO THE PARKING BRAKE SHUTTLE VALVE UNDER THE INSTRUMENT PANEL AREA WERE INADVERTENTLY REVERSED, ALLOWING BRAKING ACTION TO TAKE PLACE ON THE OPPOSITE LANDING GEAR OF THE BRAKE PEDAL BEING DEPRESSED. THE FLT CREW WAS UNAWARE OF THIS CONDITION SINCE THEY HAD BEEN USING ASYMMETRICAL THRUST FOR DIRECTIONAL CONTROL UNTIL THIS TAKEOFF.

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

LANDING GEAR,NORMAL BRAKE SYSTEM..INCORRECT

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

MAINTENANCE,REPLACEMENT..IMPROPER..COMPANY MAINTENANCE PERSONNEL

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

LANDING GEAR,NORMAL BRAKE SYSTEM..ASYMMETRICAL



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