PLT INSTRUCTOR CONCERNED ABOUT TFC PATTERN FLOW CREATING NEAR MISSES AT ATC CTLED ARPT.

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THERE IS A SIT AT GYR ARPT THAT KEEPS REPEATING ITSELF. ATC TWR IS AT FAULT; I BELIEVE; AND IF THE UNSAFE PRACTICE IS NOT CHANGED; THERE MAY HAPPEN A MIDAIR COLLISION IN THE ATA AT GYR. WE HAVE A NATURAL LANDMARK OVER WHICH GYR TWR DIRECTS TFC FOR A 45 DEG TO L DOWNWIND ENTRY TO RWY 21. IT IS CALLED 'THE GAP.' TFC COMING THROUGH THE GAP IS LINED UP FOR A 45 DEG ENTRY TO L DOWNWIND RWY 21. THE PROB IS THAT THE TWR CLRS OTHERS FOR TKOF RWY 21 FOR A L DOWNWIND DEP. 99 PERCENT OF THE OPS AT GYR ARE BY THE STUDENTS OF ACR FO AIRLINE TRAINING CTR. MOST OF THE TFC LEAVES AT XA00 LCL AND RETURNS JUST BEFORE XB00 LCL; LEAVES AGAIN AT XB00 LCL AND RETURNS XC00. MANY OF THE SOLO STUDENTS ARE EXTREMELY WEAK. A COUPLE OR 3 OF THE TWR CTLRS ARE QUITE WEAK WITH A BIT OF AN 'ATTITUDE.' PROBABLY 75 PERCENT OR MORE OF THE CLOSE CALLS NEAR THE GREEN CIRCLE COULD BE AVOIDED IF THE TWR WOULD WARN THE DEP TFC TO WATCH FOR TFC INBOUND FROM THE GAP. THEY DON'T DO THIS ALL THE TIME. THE TWR HAS A BRIGHT SCOPE; TOO. EVEN THOUGH I AM QUITE AWARE OF THIS DANGER AND I AM EXTRA ALERT WHILE MAKING L DOWNWIND DEPS; I HAVE ONLY BEEN WARNED OF INBOUND TFC PERHAPS 6 TIMES OVER THE LAST 2-3 YRS. I HAVE HAD 3 CLOSE CALLS IN THE GREEN CIRCLE IN THE LAST YR IN SPITE OF MY BEING ALERT.