Narrative:

I arrived at palm beach international (pbi) and blocked in at XA07Z and blocked out at XA11Z. I believed I was cleared to runway 9L. I was instructed to hold short of runway 13/31. I taxied west on taxiway east, and approaching runway 13/31 I was cleared to cross. I visually cleared the runway and final and continued across to taxiway F. Proceeding northwest on taxiway F I asked the ground controller if it would help if I departed at the taxiway F intersection (taxiway F intersects runways 9L and not runway 9R). The controller responded that it would probably not help because of arriving aircraft. I responded that I would continue to the end, referring to runway 9L although unfortunately I did not specify which runway. I taxied west on taxiway right to the west end. Approaching the end I considered querying the controller about my clearance to cross runway 9R but recalling my conversation with ground about taking the runway 9L intersection I was convinced that I was cleared to runway 9L. I stopped and visually cleared the runway and final. I saw no conflicts and proceeded across and held short of runway 9L on taxiway south. I called tower and was told to continue holding short for landing traffic and I complied. After the traffic landed I was cleared for takeoff on runway 9L. I departed and proceeded to ft lauderdale international (fll) where the ground controller instructed me to call palm beach tower. A that time pbi tower informed me that I had been cleared to runway 9R not runway 9L and had crossed runway 9R without clearance to do so. According to them I was issued clearance to runway 9R and read it back. I do not dispute this. I only remember believing I was cleared to runway 9L. Contributing factors: 1) in retrospect I was too focused on making up time as I was behind schedule. Had I taken more time to write down my taxi instructions as I had my departure clearance this would have been avoided. 2) when I had a moment of doubt about my clearance I should have asked instead of convincing myself I was right based on my conversation with ground about the intersection departure and continuing to the end. 3) I should have used more precise language and specified I was continuing to runway 9L. This might have better keyed the controller to realize I was going to the wrong runway. This was not a deliberate defiance of the controller's instructions but an unfortunate mistake. I will certainly be more diligent and cautious in the future.

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Original NASA ASRS Text

Title: PLT OF A CESSNA 210 FAILED TO HOLD SHORT OF THE R PARALLEL RWY WHILE TAXIING TO THE L PARALLEL RWY TO WHICH HE HAD NOT BEEN CLRED.

Narrative: I ARRIVED AT PALM BEACH INTL (PBI) AND BLOCKED IN AT XA07Z AND BLOCKED OUT AT XA11Z. I BELIEVED I WAS CLRED TO RWY 9L. I WAS INSTRUCTED TO HOLD SHORT OF RWY 13/31. I TAXIED W ON TXWY E, AND APCHING RWY 13/31 I WAS CLRED TO CROSS. I VISUALLY CLRED THE RWY AND FINAL AND CONTINUED ACROSS TO TXWY F. PROCEEDING NW ON TXWY F I ASKED THE GND CTLR IF IT WOULD HELP IF I DEPARTED AT THE TXWY F INTXN (TXWY F INTERSECTS RWYS 9L AND NOT RWY 9R). THE CTLR RESPONDED THAT IT WOULD PROBABLY NOT HELP BECAUSE OF ARRIVING ACFT. I RESPONDED THAT I WOULD CONTINUE TO THE END, REFERRING TO RWY 9L ALTHOUGH UNFORTUNATELY I DID NOT SPECIFY WHICH RWY. I TAXIED W ON TXWY R TO THE W END. APCHING THE END I CONSIDERED QUERYING THE CTLR ABOUT MY CLRNC TO CROSS RWY 9R BUT RECALLING MY CONVERSATION WITH GND ABOUT TAKING THE RWY 9L INTXN I WAS CONVINCED THAT I WAS CLRED TO RWY 9L. I STOPPED AND VISUALLY CLRED THE RWY AND FINAL. I SAW NO CONFLICTS AND PROCEEDED ACROSS AND HELD SHORT OF RWY 9L ON TXWY S. I CALLED TWR AND WAS TOLD TO CONTINUE HOLDING SHORT FOR LNDG TFC AND I COMPLIED. AFTER THE TFC LANDED I WAS CLRED FOR TKOF ON RWY 9L. I DEPARTED AND PROCEEDED TO FT LAUDERDALE INTL (FLL) WHERE THE GND CTLR INSTRUCTED ME TO CALL PALM BEACH TWR. A THAT TIME PBI TWR INFORMED ME THAT I HAD BEEN CLRED TO RWY 9R NOT RWY 9L AND HAD CROSSED RWY 9R WITHOUT CLRNC TO DO SO. ACCORDING TO THEM I WAS ISSUED CLRNC TO RWY 9R AND READ IT BACK. I DO NOT DISPUTE THIS. I ONLY REMEMBER BELIEVING I WAS CLRED TO RWY 9L. CONTRIBUTING FACTORS: 1) IN RETROSPECT I WAS TOO FOCUSED ON MAKING UP TIME AS I WAS BEHIND SCHEDULE. HAD I TAKEN MORE TIME TO WRITE DOWN MY TAXI INSTRUCTIONS AS I HAD MY DEP CLRNC THIS WOULD HAVE BEEN AVOIDED. 2) WHEN I HAD A MOMENT OF DOUBT ABOUT MY CLRNC I SHOULD HAVE ASKED INSTEAD OF CONVINCING MYSELF I WAS RIGHT BASED ON MY CONVERSATION WITH GND ABOUT THE INTXN DEP AND CONTINUING TO THE END. 3) I SHOULD HAVE USED MORE PRECISE LANGUAGE AND SPECIFIED I WAS CONTINUING TO RWY 9L. THIS MIGHT HAVE BETTER KEYED THE CTLR TO REALIZE I WAS GOING TO THE WRONG RWY. THIS WAS NOT A DELIBERATE DEFIANCE OF THE CTLR'S INSTRUCTIONS BUT AN UNFORTUNATE MISTAKE. I WILL CERTAINLY BE MORE DILIGENT AND CAUTIOUS IN THE FUTURE.

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.