Narrative:

On a scheduled commuter flight from cmh to pit in an small transport, empty, I put the first officer in the left seat to accomplish some PIC training. The WX was multiple broken decks and 2 mi visibility with a 4 degree dew point spread. We switched to speakers so that we could talk more without using interphones. We were cleared into position and hold on runway 10R. While talking with the first officer about the takeoff and initial climb, I and the first officer thought we heard a cleared to takeoff. We took off, first officer flying, and at about 400' AGL, tower yelled at us to turn north immediately and said we weren't cleared for takeoff. After turning north and climbing we were told to call the tower when on the ground. Tower had cleared a small plane onto runway 10 about halfway down the runway and it was that airplane that was cleared to take off, not me. We had taken off well before his position and were climbing over him. I did not see this plane as we rolled (3000' takeoff roll). Looking at if from the tail, no lights, if on, caught my eye. My problem was twofold. The first mistake was going to speakers for radio reception, which are poor at best, thinking cross-cockpit talk would be more effective. The second mistake was old as time, talking too much about what should have been discussed before. A third one would be hearing what I wanted to hear or expected to hear. We have been briefing communication awareness out of FAA's call to action all this year. It's time I listen to my own briefings.

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Original NASA ASRS Text

Title: CLOSE PROX COMMUTER SMT GA-SMA. COMMUTER MADE UNAUTH TKOF FROM SAME RWY SMA HAD JUST USED FOR INTXN TKOF.

Narrative: ON A SCHEDULED COMMUTER FLT FROM CMH TO PIT IN AN SMT, EMPTY, I PUT THE F/O IN THE LEFT SEAT TO ACCOMPLISH SOME PIC TRAINING. THE WX WAS MULTIPLE BROKEN DECKS AND 2 MI VISIBILITY WITH A 4 DEG DEW POINT SPREAD. WE SWITCHED TO SPEAKERS SO THAT WE COULD TALK MORE WITHOUT USING interphones. WE WERE CLRED INTO POSITION AND HOLD ON RWY 10R. WHILE TALKING WITH THE F/O ABOUT THE TKOF AND INITIAL CLIMB, I AND THE F/O THOUGHT WE HEARD A CLRED TO TKOF. WE TOOK OFF, F/O FLYING, AND AT ABOUT 400' AGL, TWR YELLED AT US TO TURN N IMMEDIATELY AND SAID WE WEREN'T CLRED FOR TKOF. AFTER TURNING N AND CLIMBING WE WERE TOLD TO CALL THE TWR WHEN ON THE GND. TWR HAD CLRED A SMALL PLANE ONTO RWY 10 ABOUT HALFWAY DOWN THE RWY AND IT WAS THAT AIRPLANE THAT WAS CLRED TO TAKE OFF, NOT ME. WE HAD TAKEN OFF WELL BEFORE HIS POSITION AND WERE CLIMBING OVER HIM. I DID NOT SEE THIS PLANE AS WE ROLLED (3000' TKOF ROLL). LOOKING AT IF FROM THE TAIL, NO LIGHTS, IF ON, CAUGHT MY EYE. MY PROBLEM WAS TWOFOLD. THE FIRST MISTAKE WAS GOING TO SPEAKERS FOR RADIO RECEPTION, WHICH ARE POOR AT BEST, THINKING CROSS-COCKPIT TALK WOULD BE MORE EFFECTIVE. THE SECOND MISTAKE WAS OLD AS TIME, TALKING TOO MUCH ABOUT WHAT SHOULD HAVE BEEN DISCUSSED BEFORE. A THIRD ONE WOULD BE HEARING WHAT I WANTED TO HEAR OR EXPECTED TO HEAR. WE HAVE BEEN BRIEFING COM AWARENESS OUT OF FAA'S CALL TO ACTION ALL THIS YEAR. IT'S TIME I LISTEN TO MY OWN BRIEFINGS.

Data retrieved from NASA's ASRS site as of August 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.