Narrative:

I was the captain and inputting our course in the RNAV. It was tstming and raining in all quadrants around the airport. I was also analyzing the WX and our best course of action. My copilot, whose sole purpose in the airplane is to work the radios, responded to all calls from the tower. Gregg co tower responded, 'you're cleared to takeoff on 13.' I didn't hear the number of the runway said in the transmission. It was then turned to my copilot and asked, 'we were cleared to takeoff on 17, correct?' he verified by saying, 'this is correct, 17.' (our day began at early am, I could see he was growing tired). I proceeded to taxi on runway 17. No other airplanes were around at the time of our takeoff. We took off on runway 17 and then I heard tower respond, 'no, you took off on 17, not 13, no problem though, contact departure.' my copilot, once again, did not hear this transmission so I relayed to him that we had taken off on the wrong runway, the one he verified was correct. I realize it is my responsibility, the captain, to take the responsibility of my negligent copilot and mistakes. His 'tired' state of awareness should have been more apparent to me and I should have gotten on the radio and asked them myself what runway to takeoff (17 or 13). I counted on and accepted his response to my question without doublechking. From now on, I will take it upon myself, all questions when flying with him (or any tired/unattentive copilot).

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Original NASA ASRS Text

Title: CORP ACFT TKOF ON WRONG RWY.

Narrative: I WAS THE CAPT AND INPUTTING OUR COURSE IN THE RNAV. IT WAS TSTMING AND RAINING IN ALL QUADRANTS AROUND THE ARPT. I WAS ALSO ANALYZING THE WX AND OUR BEST COURSE OF ACTION. MY COPLT, WHOSE SOLE PURPOSE IN THE AIRPLANE IS TO WORK THE RADIOS, RESPONDED TO ALL CALLS FROM THE TWR. GREGG CO TWR RESPONDED, 'YOU'RE CLRED TO TKOF ON 13.' I DIDN'T HEAR THE NUMBER OF THE RWY SAID IN THE XMISSION. IT WAS THEN TURNED TO MY COPLT AND ASKED, 'WE WERE CLRED TO TKOF ON 17, CORRECT?' HE VERIFIED BY SAYING, 'THIS IS CORRECT, 17.' (OUR DAY BEGAN AT EARLY AM, I COULD SEE HE WAS GROWING TIRED). I PROCEEDED TO TAXI ON RWY 17. NO OTHER AIRPLANES WERE AROUND AT THE TIME OF OUR TKOF. WE TOOK OFF ON RWY 17 AND THEN I HEARD TWR RESPOND, 'NO, YOU TOOK OFF ON 17, NOT 13, NO PROBLEM THOUGH, CONTACT DEP.' MY COPLT, ONCE AGAIN, DID NOT HEAR THIS XMISSION SO I RELAYED TO HIM THAT WE HAD TAKEN OFF ON THE WRONG RWY, THE ONE HE VERIFIED WAS CORRECT. I REALIZE IT IS MY RESPONSIBILITY, THE CAPT, TO TAKE THE RESPONSIBILITY OF MY NEGLIGENT COPLT AND MISTAKES. HIS 'TIRED' STATE OF AWARENESS SHOULD HAVE BEEN MORE APPARENT TO ME AND I SHOULD HAVE GOTTEN ON THE RADIO AND ASKED THEM MYSELF WHAT RWY TO TKOF (17 OR 13). I COUNTED ON AND ACCEPTED HIS RESPONSE TO MY QUESTION WITHOUT DOUBLECHKING. FROM NOW ON, I WILL TAKE IT UPON MYSELF, ALL QUESTIONS WHEN FLYING WITH HIM (OR ANY TIRED/UNATTENTIVE COPLT).

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.