Narrative:

I was a student pilot on a solo training flight. I taxied to runway 33 to do my run-up. After my run-up, I contacted addison tower for instructions. The tower instructed me to hold short of the runway 33 at taxiway a. I could not understand ATC, so I called him to repeat the instruction. ATC repeated 'hold short of runway 33.' I repeated the instruction to ATC, but misinterpreted the instruction as meaning to 'taxi onto runway 33 and hold.' so, after repeating the instruction to hold short of runway 33, I proceeded to taxi onto runway 33 and hold. After a few seconds a plane was cleared to land, and the plane that was cleared to land asked ATC if the plane on the runway (which was me) was going to take off. Then, ATC instructed that plane to go around. Then ATC informed me of my mistake, cleared me for takeoff, and asked me to call ATC upon my return to addison. The cause of the problem was my misinterp of the instruction from ATC. I heard clearly what ATC said, just misunderstood because he gave me the instruction in a different 'phraseology' than I am used to. I learned, that if ever there is a doubt to not only what ATC said, but also by what they meant, that I should become crystal clear of ATC's instructions before taxiing onto an active runway or taxiway. This goes for both on the ground, while flying the pattern and anywhere else.

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Original NASA ASRS Text

Title: C172 STUDENT PLT AT ADS MISUNDERSTANDS ATC CLRNC AND ENTERS RWY RESULTING IN GAR.

Narrative: I WAS A STUDENT PLT ON A SOLO TRAINING FLT. I TAXIED TO RWY 33 TO DO MY RUN-UP. AFTER MY RUN-UP, I CONTACTED ADDISON TWR FOR INSTRUCTIONS. THE TWR INSTRUCTED ME TO HOLD SHORT OF THE RWY 33 AT TXWY A. I COULD NOT UNDERSTAND ATC, SO I CALLED HIM TO REPEAT THE INSTRUCTION. ATC REPEATED 'HOLD SHORT OF RWY 33.' I REPEATED THE INSTRUCTION TO ATC, BUT MISINTERPRETED THE INSTRUCTION AS MEANING TO 'TAXI ONTO RWY 33 AND HOLD.' SO, AFTER REPEATING THE INSTRUCTION TO HOLD SHORT OF RWY 33, I PROCEEDED TO TAXI ONTO RWY 33 AND HOLD. AFTER A FEW SECONDS A PLANE WAS CLRED TO LAND, AND THE PLANE THAT WAS CLRED TO LAND ASKED ATC IF THE PLANE ON THE RWY (WHICH WAS ME) WAS GOING TO TAKE OFF. THEN, ATC INSTRUCTED THAT PLANE TO GO AROUND. THEN ATC INFORMED ME OF MY MISTAKE, CLRED ME FOR TKOF, AND ASKED ME TO CALL ATC UPON MY RETURN TO ADDISON. THE CAUSE OF THE PROB WAS MY MISINTERP OF THE INSTRUCTION FROM ATC. I HEARD CLRLY WHAT ATC SAID, JUST MISUNDERSTOOD BECAUSE HE GAVE ME THE INSTRUCTION IN A DIFFERENT 'PHRASEOLOGY' THAN I AM USED TO. I LEARNED, THAT IF EVER THERE IS A DOUBT TO NOT ONLY WHAT ATC SAID, BUT ALSO BY WHAT THEY MEANT, THAT I SHOULD BECOME CRYSTAL CLR OF ATC'S INSTRUCTIONS BEFORE TAXIING ONTO AN ACTIVE RWY OR TXWY. THIS GOES FOR BOTH ON THE GND, WHILE FLYING THE PATTERN AND ANYWHERE ELSE.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.