PLT OF PA28 EXPERIENCES NEAR MISS WITH AN E120 DEPARTING INTERSECTING RWY WHEN HE MISTAKES THE SIMILAR CALL SIGN FOR HIS OWN AND TAKES OFF WITHOUT A CLRNC.

Narrative

I TAXIED TO RWY 31 AND DID MY RUN-UP CHKS; THEN HELD SHORT OF RWY 31 ON TXWY H; STILL LISTENING TO THE GND FREQ. MY CALL SIGN WAS XXX AND I HEARD 'XXY CLRED FOR TKOF' ON THE GND FREQ; WHICH I THOUGHT WAS MY CALL SIGN AND I LINED UP ON RWY 31 AND TOOK OFF. SOON AFTER TKOF; I SAW A LARGE ACFT DEPARTING RWY 4. I THEN LEVELED OFF TO AVOID A COLLISION WITH THE ACFT. AFTER I WAS CLR OF THE ACFT; I CONTINUED OUTBOUND ON RWY HDG. AFTER 1 MIN; TWR CALLED ME AND REQUESTED THAT I CALL THEM WHEN I LAND. AFTER THIS; I CONTINUED ON MY HDG FOR ABOUT 10 MI. AT THIS POINT; I TURNED AROUND AND HEADED BACK TO TYLER ARPT; LANDED; AND TAXIED BACK TO PARKING AND CONTACTED THE TWR AS REQUESTED. CONTRIBUTING FACTORS: 1) 2 ACFT WITH SIMILAR CALL SIGNS (XXX AND XXY). 2) TWR WAS XMITTING OVER THE GND FREQ. 3) IT WAS NOT POSSIBLE TO SEE ANOTHER ACFT LINE UP ON RWY 4. CORRECTIVE ACTIONS: 1) SAW THE OTHER ACFT ON MY L AND THEN LEVELED OFF. 2) CONTACTED TWR AND CHIEF FLYING INSTRUCTOR WHEN BACK ON THE GND. 3) HAVING 2 HRS TRAINING AND A DUAL CHKOUT WITH CFI.