AIR TRACTOR INC AT-502B near Tillar, AR — 2013-07-03

Probable cause

The loss of engine throttle control during takeoff due to an unsecured cockpit throttle control pin, which resulted in a runway overrun.

NTSB narrative

During takeoff, the airplane sustained a partial loss of engine power and overran the runway after the pilot lost cockpit throttle control. Postaccident examination of the airplane revealed a throttle control pin lying on the cockpit floor. A cotter pin for the throttle control pin was missing; the length of time it had been missing could not be determined.

Analysis

Primary failure mode

Mechanical failure

First missed decision gate

Ensure all throttle control components are secure before takeoff.

NTSB coding

• Part(s) separation from AC · Takeoff

Evidence available

• Photos
• 6 docket documents

Docket documents6

• Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 - Requestform
• Maintenance Records - 100-hour Inspectionother
• Record of Conversation - FAA Inspectorother
• Photo 1 - Fuselage and Wing Damagephotos
• Photo 2 - Throttle Quadrantphotos
• Photo 3 - Photo of Throttle Control Pin on Cockpit Floorphotos

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