AN INSTRUCTOR AND HIS STUDENT IN A C152 GAVE AN INCORRECT POS RPT TO ATCT LCL CTLR AND THEN HAD AN NMAC WITH AN ACR BE99 ON APCH.

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WHILE ON A VFR TRAINING EXERCISE; OUR C152 WAS APPROX 7-9 MI SW OF WESTMORELAND ARPT AND OUTSIDE OF CLASS D AIRSPACE. WE BEGAN A DIVERSION EXERCISE TOWARDS INDIANA COUNTY ARPT; APPROX 25 MI NNE OF WESTMORELAND. I HAD INSTRUCTED THE STUDENT TO RPT HIS POS TO TWR (WESTMORELAND) AND ASK FOR A CLASS D AIRSPACE TRANSITION CLRNC SINCE OUR PROJECTED RTE OF FLT MAY TAKE US JUST INTO THE WESTMORELAND CLASS D AIRSPACE. WHILE HE MADE HIS POS RPT; I MADE SURE WE REMAINED CLR OF THE CLASS D AIRSPACE AND CONTINUED LOOKING FOR TFC IN THE ARPT AREA. WE RECEIVED OUR TRANSITION CLRNC THROUGH THE CLASS D AIRSPACE AND PROCEEDED ON COURSE; TAKING US TO THE EXTREME WESTERN EDGE OF THE CLASS D AIRSPACE. WHILE APPROX ABEAM THE AIRFIELD; WE NOTICED ANOTHER ACFT IN THE AREA AND TOOK ACTION TO PROPERLY AVOID IT. IT SO HAPPENS THAT THE ACFT WAS A COMMUTER BE99 ON A VISUAL APCH AND WAS ON DOWNWIND TO BASE AT THE TIME. WE SAW AND AVOIDED HIM; BUT APPARENTLY HIS TCASII WARNING WENT OFF AND HE MENTIONED TO TWR THAT WE WERE APPROX 200 FT FROM HIS ACFT AND HE HAD TO MAKE A 30 DEG BANK TO AVOID US. NOT SO. WE WERE MORE THAN 200 FT AND MADE SURE HE WAS ABLE TO PASS TO OUR R; CLR OF US. I'M SURE OUR SLOW AIRSPD AND HIS FAST AIRSPD CONTRIBUTED TO HIS BEING UPSET AT OUR PROX TO HIM. WHEN THEY CONTACTED THE TWR; THE TWR MENTIONED THAT THEY DIDN'T SEE US AND EXPECTED US TO BE PASSING FROM THE SE. MY STUDENT APPARENTLY MISRPTED OUR POS FROM 7-9 MI SW TO 7-9 MI SE. WE WERE NEVER SE OF THE FIELD; DIDN'T CROSS THE FINAL APCH COURSE FOR THE ACTIVE RWY 5; AND REMAINED WELL CLR OF THE CLASS D UNTIL RECEIVING A TRANSITION CLRNC BY THE TWR. THE PLTS OF THE BE99 FELT WE WERE TOO CLOSE WHILE I KNOW WE SAW THE ACFT AND TOOK ACTION TO PASS WELL CLR. THE ONLY SUGGESTION IN THIS MATTER I CAN SUGGEST IS TO HAVE RADAR AT CLASS D ARPTS FOR SITS LIKE THIS SINCE TWR COULDN'T SEE US AND FOR ANYONE OUT THERE FLYING; BETTER POS RPTING. CONDITIONS WERE VFR IN CTLED AIRSPACE.