Narrative:

We were beginning our last leg of a 7 1/2 hour block day. We were going to stewart international, the company's maintenance base, to drop off the plane. The plane didn't have any passenger because we were going to the maintenance base. The plane was facing north at the base of the control tower. I called for the taxi clearance and was instructed to taxi to runway 35 via taxiway B to taxiway a. Both the captain and I heard the taxi clearance and we were both open to the airport diagram in our manual. As we pulled out, the captain called for the before takeoff checklist. I began through the takeoff checks until ground called us inquiring about our position on runway 35 at taxiway B. Instead of making a right turn on taxiway a, we proceeded to cross runway 35. Fortunately no one was taking off or landing on runway 35. Both of us heard and understood the clearance. As far as my role goes, delaying the before takeoff checklist until we were closer to the end of the runway would have been better. 2 eyes on the taxi route are always better than one. Because it was the last flight of the day, we were empty, and we had been flying together all month led to complacency and a let-down of our watch over each other. Supplemental information from acn 252477: while attempting to complete the before takeoff checklist, I misread the taxi diagram, and inadvertently crossed runway 35 without a clearance. Fortunately, I had visually checked for traffic, and no conflict resulted. I also think that I got complacent because mht is a 'small' airport. At large airports, I always have the taxi diagram clipped to my yoke, and pay close attention to taxiing. I am going to start doing this at all airports now.

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Original NASA ASRS Text

Title: RWY INCURSION. UNAUTH RWY ENTRY OP XING.

Narrative: WE WERE BEGINNING OUR LAST LEG OF A 7 1/2 HR BLOCK DAY. WE WERE GOING TO STEWART INTL, THE COMPANY'S MAINT BASE, TO DROP OFF THE PLANE. THE PLANE DIDN'T HAVE ANY PAX BECAUSE WE WERE GOING TO THE MAINT BASE. THE PLANE WAS FACING N AT THE BASE OF THE CTL TWR. I CALLED FOR THE TAXI CLRNC AND WAS INSTRUCTED TO TAXI TO RWY 35 VIA TXWY B TO TXWY A. BOTH THE CAPT AND I HEARD THE TAXI CLRNC AND WE WERE BOTH OPEN TO THE ARPT DIAGRAM IN OUR MANUAL. AS WE PULLED OUT, THE CAPT CALLED FOR THE BEFORE TKOF CHKLIST. I BEGAN THROUGH THE TKOF CHKS UNTIL GND CALLED US INQUIRING ABOUT OUR POS ON RWY 35 AT TXWY B. INSTEAD OF MAKING A R TURN ON TXWY A, WE PROCEEDED TO CROSS RWY 35. FORTUNATELY NO ONE WAS TAKING OFF OR LNDG ON RWY 35. BOTH OF US HEARD AND UNDERSTOOD THE CLRNC. AS FAR AS MY ROLE GOES, DELAYING THE BEFORE TKOF CHKLIST UNTIL WE WERE CLOSER TO THE END OF THE RWY WOULD HAVE BEEN BETTER. 2 EYES ON THE TAXI RTE ARE ALWAYS BETTER THAN ONE. BECAUSE IT WAS THE LAST FLT OF THE DAY, WE WERE EMPTY, AND WE HAD BEEN FLYING TOGETHER ALL MONTH LED TO COMPLACENCY AND A LET-DOWN OF OUR WATCH OVER EACH OTHER. SUPPLEMENTAL INFO FROM ACN 252477: WHILE ATTEMPTING TO COMPLETE THE BEFORE TKOF CHKLIST, I MISREAD THE TAXI DIAGRAM, AND INADVERTENTLY CROSSED RWY 35 WITHOUT A CLRNC. FORTUNATELY, I HAD VISUALLY CHKED FOR TFC, AND NO CONFLICT RESULTED. I ALSO THINK THAT I GOT COMPLACENT BECAUSE MHT IS A 'SMALL' ARPT. AT LARGE ARPTS, I ALWAYS HAVE THE TAXI DIAGRAM CLIPPED TO MY YOKE, AND PAY CLOSE ATTN TO TAXIING. I AM GOING TO START DOING THIS AT ALL ARPTS NOW.

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.