A PERSPECTIVE GRUMMAN AA5 PURCHASER WAS ALLOWED BY THE ACFT OWNER TO FLY; AND THAT PLT LANDED OFF THE PAVED RWY AT DEST.

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I AM THE OWNER OF THE AIRPLANE. THE BUYER; A PVT PLT; WANTED TO FLY THE AIRPLANE TO A MECH FOR PRE-BUY INSPECTION. I ALLOWED HIM TO FLY AS PIC IF I FLEW WITH HIM TO ASSIST. HE HAD LESS THAN 20 HRS TIME IN TYPE AND HAD NOT FLOWN IN THE PAST 30 DAYS. ON INITIAL DEP FROM THE ARPT; THE PLT BECAME DISORIENTED AND BEGAN A TURN TO THE W; ALTHOUGH THE TWR HAD CLRED HIM FOR AN E TURNOUT AND OUR DEST WAS E. I CORRECTED HIM AND HE TURNED E XWIND AND LEFT THE AREA. THE DEST ARPT WAS A SHORT; NARROW FIELD. THE PLT INTENDED TO CROSS OVER THE ARPT AT PATTERN ALT; BUT I ASKED HIM TO STAY AT LEAST 500 FT ABOVE PATTERN UNTIL WE TRANSITIONED ACROSS THE FIELD. THE PLT THEN GOT DISORIENTED; CALLED DOWNWIND FOR THE S RWY ON THE CTAF; BUT ENTERED DOWNWIND FOR THE N RWY. I ASKED WHICH RWY HE INTENDED TO LAND ON; AND HE REALIZED HIS MISTAKE. CONDITIONS WERE NO WINDS AND THERE WERE NO OTHER AIRPLANES IN THE PATTERN OR APCHING THE ARPT; SO HE ATTEMPTED A LNDG ON THE N RWY. HIS AIRSPD WAS 5 KTS TOO FAST AND HE WAS TOO HIGH; SO HE INITIATED A GAR AND MANEUVERED FOR A DOWNWIND TO THE S RWY. I CHKED ATIS FOR AN ARPT 10 MI TO THE E; AND CONDITIONS WERE ALTIMETER 30.14 AND WINDS 150 DEGS AT 5 KTS. ON FINAL APCH; THE PLT'S AIRSPD FLUCTUATED BY AS MUCH AS 15 KTS AND HE CAME WITHIN 5 KTS OF STALL. AS HE DSNDED TOWARDS THE RWY; HE WAS DETERMINED HE WOULD LAND SHORT AND STARTED TO PULL UP ON THE YOKE. I TOLD HIM TO ADD PWR; AND HE DID. HE LANDED SAFELY ON THE NUMBERS AT FULL STALL; THEN BALLOONED. HE LOST CTL OF THE AIRPLANE AND DRIFTED TO THE E SIDE OF THE RWY; WHERE THERE IS AN OPEN GRASS AREA THE LENGTH OF THE RWY AND ABOUT 500 FT WIDE; WITH SHRUBS LINING THE FAR SIDE. I TOLD HIM 'GO AROUND!' BUT HE DID NOT. I ADDED FULL PWR AND GRABBED THE CTLS. HE GRABBED THE CTLS AND HE WAS STRONGER THAN I WAS; AND HE TURNED THE IGNITION SWITCH OFF. THE ENG STOPPED AND THE AIRPLANE SETTLED BACK DOWN ON THE RWY AND SLOWED TO A STOP IN THE SHRUBS. THERE WAS NO SUBSTANTIAL DAMAGE AND NOBODY WAS HURT. WHAT CONTRIBUTED TO THE INCIDENT: 1) AFTER HIS INITIAL MISTAKES; I SHOULD HAVE TAKEN THE CTLS AND LANDED AT THE DEST; BUT MISJUDGED HIS ABILITY TO HANDLE THE AIRPLANE. AFTER HIS UNSTABLE APCH; I AGAIN SHOULD HAVE TAKEN THE CTLS; DONE A GAR; AND LANDED. 2) THE PLT WAS CURRENT; BUT NOT PROFICIENT. HE SHOULD NOT HAVE ATTEMPTED A LNDG IN AN UNFAMILIAR AIRPLANE AT AN UNFAMILIAR FIELD. HE EXPRESSED SOME DISCOMFORT WITH THE SHORT/NARROW FIELD. I WAS NOT UNCOMFORTABLE WITH THE FIELD AND HAD LANDED THERE 5-6 TIMES IN THE PAST 90 DAYS. 3) WE SHOULD HAVE DISCUSSED POSITIVE EXCHANGE OF CTLS AND HOW WE WOULD HANDLE POSSIBLE OUTCOMES BEFORE STARTING THE FLT.