Linesman Duties
The linesman's primary responsibilities during a football game are divided into four categories: before the snap of the ball, snap of the ball, the play itself and mechanics of the chain crew. Knowing exactly what the line of scrimmage is helps in understanding the responsibilities of the linesman.
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Line of Scrimmage
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The line of scrimmage is defined as a parallel line that extends from the tip of the football and runs from sideline to sideline. Players are not permitted to cross this imaginary line until the ball is snapped.
Before the Snap
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The linesman straddles the line of scrimmage near the sideline. He is watching the running back on his side of the field. The linesman is responsible for ruling on offside, encroachment and all actions pertaining to the scrimmage line before or at the snap of the ball.
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Snap of the Ball
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On pass plays, the linesman is responsible to clear his receiver seven yards down field as the linesman moves to a spot five yards beyond the line of scrimmage.
The linesman is responsible for ruling on sideline plays on his side of the field. This includes plays both in and out of bounds.
The linesman is responsible for calling both offensive and defensive pass interference on his side of the field.
The linesman will also assist the referee on intentional grounding of the ball by the quarterback.
Running Plays
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The linesman is responsible for ruling on the legality of running plays on his side of the field.
Once the ball carrier is stopped, he is to assist in determining the forward progress of the runner.
The Chain Crew
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The linesman and the referee are responsible for the keeping track of the number of downs for the offensive team. The linesman is charge of running the chain crew. He must make sure the chains are in place and ready to go before the start of each play.
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