Air carrier crew mistakes call sign and taxies onto runway without clearance.

Attributes
ACN	450168
Time
Date	199909
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : dfw.airport
State Reference	TX
Altitude	agl single value : 0
Environment
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	MD-80 Super 80
Operating Under FAR Part	Part 121
Flight Phase	ground : taxi
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : atp
ASRS Report	450168
Person 2
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : commercial pilot : instrument
ASRS Report	450350
Events
Anomaly	incursion : runway non adherence : clearance
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

We were #1 for takeoff with checklist done. First officer said he might have heard a compressor stall, but we both agreed that it was the elevator in the tailwind. I heard the tower say position and hold and was sure it was for us. First officer read back position and hold with our flight number and it was not challenged by tower. As we went into position, the tower asked who was going onto the runway. They told us the position and hold was for another aircraft. We were then cleared for takeoff. In the future, I will make sure both of us hear any clearance before I accept it. My first officer was ready to question the tower, but I was sure I heard the correct number. The tower heard our call as well as the other aircraft but did not question who else was accepting a clearance.

Original NASA ASRS Text

Title: ACR CREW MISTAKES CALL SIGN AND TAXIES ONTO RWY WITHOUT CLRNC.

Narrative: WE WERE #1 FOR TKOF WITH CHKLIST DONE. FO SAID HE MIGHT HAVE HEARD A COMPRESSOR STALL, BUT WE BOTH AGREED THAT IT WAS THE ELEVATOR IN THE TAILWIND. I HEARD THE TWR SAY POS AND HOLD AND WAS SURE IT WAS FOR US. FO READ BACK POS AND HOLD WITH OUR FLT NUMBER AND IT WAS NOT CHALLENGED BY TWR. AS WE WENT INTO POS, THE TWR ASKED WHO WAS GOING ONTO THE RWY. THEY TOLD US THE POS AND HOLD WAS FOR ANOTHER ACFT. WE WERE THEN CLRED FOR TKOF. IN THE FUTURE, I WILL MAKE SURE BOTH OF US HEAR ANY CLRNC BEFORE I ACCEPT IT. MY FO WAS READY TO QUESTION THE TWR, BUT I WAS SURE I HEARD THE CORRECT NUMBER. THE TWR HEARD OUR CALL AS WELL AS THE OTHER ACFT BUT DID NOT QUESTION WHO ELSE WAS ACCEPTING A CLRNC.

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.