DURING TOUCH-AND-GO PRACTICE LNDGS; PVT PLT (WITH INSTRUCTOR) FORGOT TO HOLD ON THE RWY FOR TKOF CLRNC AFTER LNDG AS INSTRUCTED BY TWR CTLR. AS A RESULT; THE C152 MET ANOTHER ACFT HEAD-ON WHICH WAS MAKING A PRACTICE APCH FROM THE OPPOSITE DIRECTION.

Narrative

THE EVENT OCCURRED DURING AN ACFT CHKOUT FLT. I (CFI) WAS DEMONSTRATING AN APCH CONFIGN TO THE RENTER (PVT PLT). WHILE TURNING ONTO L BASE FOR RWY 21; AT LA CROSSE; TWR ISSUED A LNDG RESTR OF 'CLRED FOR FULL STOP RWY 21; I WILL CALL YOUR DEP;' TO WHICH I ACKNOWLEDGED. (WE WERE IN CLOSED TFC AND DOING TOUCH-AND-GOES). ON FINAL; THE RENTER AND I MADE A POSITIVE EXCHANGE OF THE CTLS SO HE COULD DO THE LNDG. HE PROCEEDED TO LAND; ROLLOUT AND ADD PWR FOR TKOF. DURING THIS TIME I WAS TALKING TO THE RENTER ABOUT THE JUST COMPLETED APCH AND LNDG. WE FAILED TO STOP AND HOLD FOR OUR TKOF CLRNC AND PROCEEDED TO CLB OUT. AT THIS TIME I REMEMBERED OUR HOLD INSTRUCTIONS; BUT IT WAS TOO LATE. THE OTHER ACFT WAS APCHING FROM THE OPPOSITE DIRECTION FOR A LOW'/MISSED VFR APCH. NO EVASIVE ACTION WAS REQUIRED. WHEN THE RENTER AND I EXCHANGED CTLS ON FINAL; I MADE THE MISTAKE OF ASSUMING HE WOULD COMPLY WITH THE CLRNC AND SUBSEQUENTLY I LET THE CLRNC RESTR SLIP FROM MY MIND WHILE I WAS TALKING TO THE RENTER ABOUT THE APCH AND LNDG.