ARTICLE 17.A player whose helmet comes completely off during a down may not continue to participate beyond the immediate action in which they are engaged, whether or not the player puts the helmet back on during the down.
Approved Ruling 9-1-17 I. During a down B55’s helmet comes off without a helmet foul by Team A. B55 immediately picks up his helmet, puts it on and continues to chase the ball carrier. RULING: Personal foul by B55 for continuing to participate after losing his helmet. The clock stops at the end of the down and B55 must leave the game for the next down. (Rule 3-3-9)