C172 STUDENT PLT LNDG SGR; EXITS RWY WHEN INADVERTENTLY APPLYING BRAKE AND RUDDER PRESSURE.

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A STUDENT IN THE PRE CHK RIDE STAGE OF HIS TRAINING TOOK A PLANE TO PRACTICE PVT PLT MANEUVERS. UPON LNDG AT SUGARLAND REGIONAL ARPT; STUDENT LANDED WITH L FOOT ON BRAKE. THIS IN TURN CAUSED THE AIRPLANE TO DEPART TO THE ADJACENT TXWY THROUGH A GRASS FIELD. NO PROPERTY DAMAGE OR DAMAGE TO THE ACFT WAS INCURRED. I FEEL THAT THIS SIT MAY HAVE BEEN AVOIDED IF CONSTANT VERBAL EMPHASIS WAS PLACED ON SLIDING FEET TO THE BOTTOM PORTION OF THE RUDDER PEDALS DURING LNDG PORTION OF THE FLT; INSTEAD OF JUST EMPHASIZING THIS DURING THE INITIAL PART OF TRAINING. SUPPLEMENTAL INFO FROM ACN 619475: I LANDED AIRPLANE WITH L RUDDER IN FOR XWIND CORRECTION. I INADVERTENTLY HAD MY L TOE ON THE BRAKE WHICH CAUSED A HARD SWERVE TO THE L. I CRAMMED PWR AND CLRED MEDIAN AND SET PLANE DOWN ON TXWY. IN THE FUTURE; I WILL BE SURE TO KEEP MY FEET OFF THE BRAKE WHEN LNDG UNTIL I AM READY TO STOP THE PLANE. SUPPLEMENTAL INFO FROM ACN 619475: I LANDED AIRPLANE WITH L RUDDER IN FOR CROSS WIND CONVECTION. I INADVERTENTLY HAD MY L TOE ON THE BRAKE WHICH CAUSED A HARD SWERVE TO THE L. I CRAMMED PWR AND CLEARED MEDIAN AND SET PLANE DOWN ON TXWY. IN THE FUTURE; I WILL BE SURE TO KEEP MY FEET OFF THE BRAKE WHEN LNDG UNTIL I AM READY TO STOP THE PLANE.