SMA FLYING LOOSE FORMATION ON A XCOUNTRY STUDENT BLUNDERED INTO R2307. HE THEN ENTERED THE YUMA CLASS D WITHOUT CLRNC.

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I ACCOMPANIED A FLYING STUDENT ON HIS LONG XCOUNTRY FROM CHANDLER TO YUMA. HE WAS AFRAID OF DOING THE FLT ON HIS OWN; SO HE PAID ME THE RENT FOR AN ACFT TO ACCOMPANY HIM. I WAS WARY TO AVOID A MIDAIR COLLISION; SO WE FLEW A HALF MI APART. I WAS NAVING MAINLY IN RELATION TO HIM; KEEPING AN EYE ON THE ROAD FROM CHANDLER TO YUMA TO STAY ON COURSE. HE HAD PROBS WITH HIS VOR NAV; SO HIS RTE WAS NOT QUITE STRAIGHT; NEITHER WAS MINE. 35 MI FROM BARD VOR ON 60 DEG RADIAL FROM; I ENTERED R2307. ABOUT 2 MI INSIDE THE RESTR AIRSPACE I REALIZED I MIGHT BE TOO FAR N AND TURNED BACK S OUT OF R2307. WHEN WE REACHED YUMA ARPT; I CONTACTED APCH ABOUT 9 MI OFF TO THE E OF BARD VOR. THEY TOLD ME TO 'PREPARE TO LAND' OR 'EXPECT TO LAND;' I CANNOT REMEMBER; ON RWY 35. THE XMISSION WAS INTERRUPTED BY OTHER CALLS. I TURNED S AND WAS INSIDE YUMA CLASS D AIRSPACE WHEN I ASKED BACK TO GET A XPONDER CODE AND FURTHER INSTRUCTIONS. LATER; ON THE GND; I WAS ACCUSED OF UNAUTH FLYING INTO YUMA CLASS D AIRSPACE BECAUSE I HAD NOT GOT A XPONDER CODE UPON ENTRY. I WAS ON THEIR APCH FREQ BUT OTHER CALLS PREVENTED ME FROM ASKING BACK EARLIER.