A ROTARY WINGED STUDENT PLT RPT OF AN NMAC WITH A XING CESSNA AT LESS THAN 1500 FT AGL; 22 MI N OF ADS; TX.

Narrative

AT APPROX AB30; 22 KM N OF ADS (002 DEGS TRUE); I WAS FLYING AT 1500 FT ON A HDG OF 178 DEGS TRUE. I WAS ON A RETURN TRIP FROM THE SOUTHWESTERN TIP OF LAKE TEXOMA WITH A FINAL DEST OF ADS. I HAD NOTED A CESSNA MAKING LOW LEVEL PASSES AT WHAT LOOKED TO BE 500 FT AGL; 2 KM W OF MY POS. IT LOOKED AS IF THE ACFT WAS PRACTICING APCHS OVER OPEN FIELDS JUST S OF THE MC MANUS PVT FIELD. I MONITORED THE ACFT UNTIL I COULD NO LONGER VIEW IT BEHIND AND TO MY R. APPROX 5 MINS AFTER THE ACFT WAS OUT OF VIEW; I NOTED WHAT APPEARED TO BE THE SAME ACFT TO MY L AT THE SAME ALT (1500 FT MSL) AS MYSELF ON APPROX THE SAME COURSE (180 DEGS). AT THE TIME I NOTED THE ACFT; IT WAS APPROX 1 MI TO MY L. AS THE ACFT PASSED ABEAM OF ME; IT MADE AN AGGRESSIVE R-HAND TURN HDG APPROX 280 DEGS. AS I SCANNED THE ACFT; I COULD NOT TELL IF THE ACFT WAS AWARE OF MY POS. AS SUCH; I IMMEDIATELY SLOWED FROM 70 KIAS TO 40 KIAS AND LOST 200 FT ALT TO INSURE IT WOULD FLY OVER ME. I THEN NOTED THE ACFT DIVING TO GET UNDER ME. SINCE I WAS NOW UNSURE WHAT THE ACFT'S INTENT WAS; I STAYED AT THE SAME ALT AND DID A QUICK STOP MANEUVER. THE CESSNA PASSED APPROX 500 FT IN FRONT AND 100 FT BELOW. THE ACFT THEN PULLED UP HARD TO AVOID HITTING THE GND AND HEADED N ON A HDG OF APPROX 310 DEGS. DURING THIS ENTIRE PERIOD; I NOTED NO LCL COM ON CTAF ADVISING OF ANY LOW LEVEL MANEUVERS OR TKOF/LNDG IN THE VICINITY. SINCE THE ONLY ARPTS WITHIN 10 KM WERE ALL PVT WITH NO CTAF/UNICOM STATIONS; I DID NOT MAKE ANY ANNOUNCEMENTS.