Narrative:

The single pilot operation was an IFR air ambulance flight. Clearance was obtained from ZZZ tower clearance delivery position including departure procedure and altitude of 5000 ft. Upon contacting ground control, we were cleared to taxi from the FBO to runway intersection departure from intersection east. As we commenced taxi, exiting the FBO ramp at intersection K, ground control issued a revised clearance including a different departure and different initial altitude (3000 ft). During the brief 'heads down' period, while I was locating the new departure chart and inputting the change into the GPS, I inadvertently crossed the taxiway, entered runway, and began taxiing along it under the impression that it was the taxiway, the normal route to intersection east. As soon as I was queried by ground control, I realized the situation and immediately exited the runway via the adjacent taxiway. Total time on the runway was under 30 seconds and there was no actual traffic conflict. The cause of this incursion was distraction from the correct taxi route due to the last-min change in clearance, compounded by the fact that it was a single-pilot operation. We have immediately instituted a change in operating procedures to mandate that at no time will clrncs or amendments be copied when operating as a single pilot while the airplane is moving on the ground. Inputs to the GPS system will similarly be carried out only when the airplane is at a stop. If necessary, the airplane will be stopped to allow these actions. Alternatively, clearance delivery or ground control position will be advised that we cannot copy clrncs until we have reached a position at which we can stop the airplane without impeding other ground traffic, and we will request that the new clearance not be issued until we have stopped and advised ready to copy it.

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Original NASA ASRS Text

Title: RWY INCURSION BY AN AIR AMBULANCE CESSNA TWIN AT ZZZ.

Narrative: THE SINGLE PLT OP WAS AN IFR AIR AMBULANCE FLT. CLRNC WAS OBTAINED FROM ZZZ TWR CLRNC DELIVERY POS INCLUDING DEP PROC AND ALT OF 5000 FT. UPON CONTACTING GND CTL, WE WERE CLRED TO TAXI FROM THE FBO TO RWY INTXN DEP FROM INTXN E. AS WE COMMENCED TAXI, EXITING THE FBO RAMP AT INTXN K, GND CTL ISSUED A REVISED CLRNC INCLUDING A DIFFERENT DEP AND DIFFERENT INITIAL ALT (3000 FT). DURING THE BRIEF 'HEADS DOWN' PERIOD, WHILE I WAS LOCATING THE NEW DEP CHART AND INPUTTING THE CHANGE INTO THE GPS, I INADVERTENTLY CROSSED THE TXWY, ENTERED RWY, AND BEGAN TAXIING ALONG IT UNDER THE IMPRESSION THAT IT WAS THE TXWY, THE NORMAL RTE TO INTXN E. AS SOON AS I WAS QUERIED BY GND CTL, I REALIZED THE SIT AND IMMEDIATELY EXITED THE RWY VIA THE ADJACENT TXWY. TOTAL TIME ON THE RWY WAS UNDER 30 SECONDS AND THERE WAS NO ACTUAL TFC CONFLICT. THE CAUSE OF THIS INCURSION WAS DISTR FROM THE CORRECT TAXI RTE DUE TO THE LAST-MIN CHANGE IN CLRNC, COMPOUNDED BY THE FACT THAT IT WAS A SINGLE-PLT OP. WE HAVE IMMEDIATELY INSTITUTED A CHANGE IN OPERATING PROCS TO MANDATE THAT AT NO TIME WILL CLRNCS OR AMENDMENTS BE COPIED WHEN OPERATING AS A SINGLE PLT WHILE THE AIRPLANE IS MOVING ON THE GND. INPUTS TO THE GPS SYS WILL SIMILARLY BE CARRIED OUT ONLY WHEN THE AIRPLANE IS AT A STOP. IF NECESSARY, THE AIRPLANE WILL BE STOPPED TO ALLOW THESE ACTIONS. ALTERNATIVELY, CLRNC DELIVERY OR GND CTL POS WILL BE ADVISED THAT WE CANNOT COPY CLRNCS UNTIL WE HAVE REACHED A POS AT WHICH WE CAN STOP THE AIRPLANE WITHOUT IMPEDING OTHER GND TFC, AND WE WILL REQUEST THAT THE NEW CLRNC NOT BE ISSUED UNTIL WE HAVE STOPPED AND ADVISED READY TO COPY IT.

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.