A CTLR CLRED A C152 TO LAND ON RWY 22; THEN CLRED ANOTHER CESSNA FOR TKOF ON A XING RWY WHEN THE C152 WAS ON A QUARTER MI FINAL. THE C152 PLT TOOK EVASIVE ACTION TO MISS THE DEPARTING CESSNA.

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I WAS ON A TRAINING FLT WITH MY INSTRUCTOR. WE WERE CLRED TO LAND ON RWY 22. WHEN I WAS ON 1/4 MI FINAL THE TWR CTLR CLRED ANOTHER SINGLE ENG CESSNA FOR TKOF FROM RWY 27; WHICH INTERSECTS RWY 22 AT THE APPROX POINT WHERE I WOULD TOUCH DOWN. TREES AROUND THE RWYS PREVENTED ME FROM SEEING THE OTHER ACFT; BUT WHEN I HEARD THE CTLR RELEASE THE OTHER ACFT FOR TKOF; I ANTICIPATED THAT A GAR WOULD BE NECESSARY. AS THE ACFT TAKING OFF EMERGED FROM BEHIND THE TREE LINE (IT WAS MOVING FROM MY L TO R) I SAW THAT A COLLISION WAS POSSIBLE AND ENGAGED FULL PWR AND; AS INSTRUCTED BY MY CFI; MANEUVERED L TO CLR VERT SPACE FOR THE ACFT TAKING OFF. THE CTLR YELLED FOR ME TO EXECUTE A GAR BUT I HAD ALREADY INITIATED THE MANEUVER. I ESTIMATE THAT VERT SEPARATION WAS LESS THAN 50 FT AND HORIZ SEPARATION AT THAT SAME DISTANCE. HAD I NOT MANEUVERED L I WOULD HAVE BEEN DIRECTLY ON TOP OF THE ACFT TAKING OFF. I LATER LEARNED THAT THE CTLR INVOLVED HAS BEEN INVOLVED IN SIMILAR NEAR MISHAPS. I MAINTAINED SITUATIONAL AWARENESS OF THE BIGGER PICTURE OF ARPT TFC; AND THEREFORE I PERCEIVED A POTENTIAL PROB AS IT WAS DEVELOPING EVEN THOUGH I WAS UNDERGOING TRAINING AT THE TIME. AS A RESULT; A POTENTIALLY TRAGIC MISHAP WAS AVOIDED. I BELIEVE THE CTLR INVOLVED DID NOT USE GOOD JUDGEMENT IN RELEASING THE OTHER ACFT FOR TKOF WHILE I WAS ABOUT TO LAND.