Narrative:

At approximately XA15 I received my clearance to taxi to runway 29L from fat ground. This is the usual clearance and I proceeded to taxi to runway 29L. 1/2 way down taxiway B, ground called and said to taxi to runway 29R to avoid a longer wake turbulence hold from a departing B757. I read back the new clearance to runway 29R. This is where the problem started. From the numerous times that I've flown out of fat, the few occasions that I have taken off from runway 29R have always been at intersection B2. For some reason, it was in my mind that runway 29R started at taxiway B2. So my understanding of the new clearance was a clearance to taxi across all txwys and runways and hold short runway 29R. I proceeded to taxi on taxiway B, turned left onto taxiway B2, crossed runway 29L and held short of runway 29R. At this time ground called and informed me of my 'possible pilot deviation.' factors: because I thought I was familiar with fat, I did not have my airport chart out. After ground informed me of my deviation, it only took 1 quick look at the airport diagram to see where I went wrong. My home base is ZZZ. They also have parallel runways, but their thresholds start at the same point. You have to cross one runway to take off on the other. This might have put me in the mind set that I had to cross runway 29L to get to runway 29R at fat. At the time fat ground gave me the new clearance to taxi to runway 29R, I was doing my weight and balance and my before takeoff checklist. I didn't put as much thinking into the new clearance as I should have. If ground control had said 'continue on taxiway B to runway 29R,' that might have clicked something in my brain regarding how to get to runway 29R. However, I don't think they could have foreseen what I did from the simple instruction 'taxi to runway 29R.' ironically, I had just read a 3-STEP program to prevent runway incursions the day before this occurrence: 1) have airport diagram out, 2) look at the routing, 3) when in doubt -- ask. This could have been avoided had I done any one of the previous.

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Original NASA ASRS Text

Title: PIPER PA31 CARGO PLT MISTAKENLY FOLLOWED TAXI RTE HE KNEW OF INSTEAD OF FOLLOWING GND CTLR'S CLRNC.

Narrative: AT APPROX XA15 I RECEIVED MY CLRNC TO TAXI TO RWY 29L FROM FAT GND. THIS IS THE USUAL CLRNC AND I PROCEEDED TO TAXI TO RWY 29L. 1/2 WAY DOWN TXWY B, GND CALLED AND SAID TO TAXI TO RWY 29R TO AVOID A LONGER WAKE TURB HOLD FROM A DEPARTING B757. I READ BACK THE NEW CLRNC TO RWY 29R. THIS IS WHERE THE PROB STARTED. FROM THE NUMEROUS TIMES THAT I'VE FLOWN OUT OF FAT, THE FEW OCCASIONS THAT I HAVE TAKEN OFF FROM RWY 29R HAVE ALWAYS BEEN AT INTXN B2. FOR SOME REASON, IT WAS IN MY MIND THAT RWY 29R STARTED AT TXWY B2. SO MY UNDERSTANDING OF THE NEW CLRNC WAS A CLRNC TO TAXI ACROSS ALL TXWYS AND RWYS AND HOLD SHORT RWY 29R. I PROCEEDED TO TAXI ON TXWY B, TURNED L ONTO TXWY B2, CROSSED RWY 29L AND HELD SHORT OF RWY 29R. AT THIS TIME GND CALLED AND INFORMED ME OF MY 'POSSIBLE PLTDEV.' FACTORS: BECAUSE I THOUGHT I WAS FAMILIAR WITH FAT, I DID NOT HAVE MY ARPT CHART OUT. AFTER GND INFORMED ME OF MY DEV, IT ONLY TOOK 1 QUICK LOOK AT THE ARPT DIAGRAM TO SEE WHERE I WENT WRONG. MY HOME BASE IS ZZZ. THEY ALSO HAVE PARALLEL RWYS, BUT THEIR THRESHOLDS START AT THE SAME POINT. YOU HAVE TO CROSS ONE RWY TO TAKE OFF ON THE OTHER. THIS MIGHT HAVE PUT ME IN THE MIND SET THAT I HAD TO CROSS RWY 29L TO GET TO RWY 29R AT FAT. AT THE TIME FAT GND GAVE ME THE NEW CLRNC TO TAXI TO RWY 29R, I WAS DOING MY WT AND BAL AND MY BEFORE TKOF CHKLIST. I DIDN'T PUT AS MUCH THINKING INTO THE NEW CLRNC AS I SHOULD HAVE. IF GND CTL HAD SAID 'CONTINUE ON TXWY B TO RWY 29R,' THAT MIGHT HAVE CLICKED SOMETHING IN MY BRAIN REGARDING HOW TO GET TO RWY 29R. HOWEVER, I DON'T THINK THEY COULD HAVE FORESEEN WHAT I DID FROM THE SIMPLE INSTRUCTION 'TAXI TO RWY 29R.' IRONICALLY, I HAD JUST READ A 3-STEP PROGRAM TO PREVENT RWY INCURSIONS THE DAY BEFORE THIS OCCURRENCE: 1) HAVE ARPT DIAGRAM OUT, 2) LOOK AT THE ROUTING, 3) WHEN IN DOUBT -- ASK. THIS COULD HAVE BEEN AVOIDED HAD I DONE ANY ONE OF THE PREVIOUS.

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.