Narrative:

First officer called for taxi. Ground told us to taxi to runway 23R via taxiway D. (Part of the normal taxiway to runway 23R was under construction, which required us to back taxi down runway 23R for takeoff.) the first officer read back those instructions plus added the phrase 'back taxi into position and hold,' to which there was no response from ground. The first officer had been to this field many times. That had been the normal taxi instructions. The captain and I had not been to this field so we did not question the taxi instructions. Relying on the knowledge of the first officer, we taxied to runway 23R via taxiway D. I was in the middle of my taxi 'flow checklist' when we crossed onto runway 23R and at that time ground told us to contact tower to back taxi to runway 23R. It was then we all realized that we should have held short of runway 23R. We contacted tower who then instructed us to back taxi into position and hold on runway 23R. We all should have been more in tune when the ground controller did not respond to the 'added phrase' by first officer and questioned the clearance for clarification. Never assume no matter how many times you have been to an airport.

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Original NASA ASRS Text

Title: B727 CREW HAD RWY INCURSION AT LCK.

Narrative: FO CALLED FOR TAXI. GND TOLD US TO TAXI TO RWY 23R VIA TXWY D. (PART OF THE NORMAL TXWY TO RWY 23R WAS UNDER CONSTRUCTION, WHICH REQUIRED US TO BACK TAXI DOWN RWY 23R FOR TKOF.) THE FO READ BACK THOSE INSTRUCTIONS PLUS ADDED THE PHRASE 'BACK TAXI INTO POS AND HOLD,' TO WHICH THERE WAS NO RESPONSE FROM GND. THE FO HAD BEEN TO THIS FIELD MANY TIMES. THAT HAD BEEN THE NORMAL TAXI INSTRUCTIONS. THE CAPT AND I HAD NOT BEEN TO THIS FIELD SO WE DID NOT QUESTION THE TAXI INSTRUCTIONS. RELYING ON THE KNOWLEDGE OF THE FO, WE TAXIED TO RWY 23R VIA TXWY D. I WAS IN THE MIDDLE OF MY TAXI 'FLOW CHKLIST' WHEN WE CROSSED ONTO RWY 23R AND AT THAT TIME GND TOLD US TO CONTACT TWR TO BACK TAXI TO RWY 23R. IT WAS THEN WE ALL REALIZED THAT WE SHOULD HAVE HELD SHORT OF RWY 23R. WE CONTACTED TWR WHO THEN INSTRUCTED US TO BACK TAXI INTO POS AND HOLD ON RWY 23R. WE ALL SHOULD HAVE BEEN MORE IN TUNE WHEN THE GND CTLR DID NOT RESPOND TO THE 'ADDED PHRASE' BY FO AND QUESTIONED THE CLRNC FOR CLARIFICATION. NEVER ASSUME NO MATTER HOW MANY TIMES YOU HAVE BEEN TO AN ARPT.

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.