Narrative:

We landed at airfield 413; knox county; mount vernon; ohio at approximately xa:30L on runway 28 in aircraft X. 413 is an uncontrolled airport. We listened to previous traffic landing 413 and they were using runway 28. Winds were calm and it was VMC. Our passenger departed the area after landing and we received a new brief to ferry aircraft X to ZZZ. I did the inside preflight; got the current ASOS; and prepared for departure as the other pilot got in and strapped in to the airplane. We had the radios on 123.05 and were now listening to a yellow and white cessna 152 call entry into the left downwind for landing on runway 28. The aircraft taxied clear of the runway and then the FBO attendant called the cessna and told them to park on the east side of the fuel pump to stay out of our way. We completed all checklists and proceeded to start our engines. Upon completion of the engine start checklist we made a radio call that 'knox country area traffic; aircraft X taxi from the FBO to runway 28; anybody in the area please advise.' we then taxied to runway 28; completed all applicable checklist and pulled to the runway approach hold line. We made another call on the same radio frequency that aircraft X is now taking the active runway 28 for departure to the west with a left turnout towards columbus.' completed all checklists and took runway 28. We proceeded with a normal takeoff. We took off VFR and got our ATC clearance while airborne from cmh approach. When we were right about the midpoint of the 5500 ft runway (the runway is crested in the middle) I heard a break in the radio squelch with static as we approached V1. As we came over the crest we noticed another low wing aircraft with his tail towards us. It appeared that the aircraft was attempting to exit the runway at the end. We made a decision to continue rather than do a high speed; close to V1 abort as we knew we were going to be airborne well before coming into the vicinity of the other jet. The takeoff was uneventful. We climbed out and contacted columbus approach. Captain was not very happy with the situation and attempted to contact the other aircraft immediately after departure to discuss what just occurred. The other aircraft never responded. He then tried to contact the FBO with no luck. When we landed at our destination captain called the FBO and again got no answer. The FBO then called back and talked to captain and said that they saw the whole thing. They stated that they too never heard the other aircraft make any kind of radio call either. There were also the two pilots from the 152 that also confirmed that this aircraft never made a position report of where he was at on the airport or on the runway. I believe this aircraft either 1. Didn't have his radio on 2. Had an inop radio 3. Had the wrong frequency tuned in 4. Wasn't paying attention. There is nothing we would have done different in this situation. I believe all pilots need to be extra cautious when operating in uncontrolled field environments and pay extreme attention to radio calls and positions of other aircraft.

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Original NASA ASRS Text

Title: A pilot reports departing CTAF airport 4I3 (Knox County) Runway 28 as an unannounced aircraft was exiting that runway.

Narrative: We landed at airfield 413; Knox County; Mount Vernon; Ohio at approximately XA:30L on Runway 28 in Aircraft X. 413 is an uncontrolled airport. We listened to previous traffic landing 413 and they were using Runway 28. Winds were calm and it was VMC. Our passenger departed the area after landing and we received a new brief to ferry Aircraft X to ZZZ. I did the inside preflight; got the current ASOS; and prepared for departure as the other pilot got in and strapped in to the airplane. We had the radios on 123.05 and were now listening to a yellow and white Cessna 152 call entry into the left downwind for landing on Runway 28. The aircraft taxied clear of the runway and then the FBO Attendant called the Cessna and told them to park on the east side of the fuel pump to stay out of our way. We completed all checklists and proceeded to start our engines. Upon completion of the engine start checklist we made a radio call that 'Knox Country area traffic; Aircraft X taxi from the FBO to Runway 28; anybody in the area please advise.' We then taxied to Runway 28; completed all applicable checklist and pulled to the runway approach hold line. We made another call on the same radio frequency that Aircraft X is now taking the active Runway 28 for departure to the west with a left turnout towards Columbus.' Completed all checklists and took runway 28. We proceeded with a normal takeoff. We took off VFR and got our ATC clearance while airborne from CMH Approach. When we were right about the midpoint of the 5500 FT runway (the runway is crested in the middle) I heard a break in the radio squelch with static as we approached V1. As we came over the crest we noticed another low wing aircraft with his tail towards us. It appeared that the aircraft was attempting to exit the runway at the end. We made a decision to continue rather than do a high speed; close to V1 abort as we knew we were going to be airborne well before coming into the vicinity of the other jet. The takeoff was uneventful. We climbed out and contacted Columbus Approach. Captain was not very happy with the situation and attempted to contact the other aircraft immediately after departure to discuss what just occurred. The other aircraft never responded. He then tried to contact the FBO with no luck. When we landed at our destination Captain called the FBO and again got no answer. The FBO then called back and talked to Captain and said that they saw the whole thing. They stated that they too never heard the other aircraft make any kind of radio call either. There were also the two pilots from the 152 that also confirmed that this aircraft never made a position report of where he was at on the airport or on the runway. I believe this aircraft either 1. Didn't have his radio on 2. Had an inop radio 3. Had the wrong frequency tuned in 4. Wasn't paying attention. There is nothing we would have done different in this situation. I believe all pilots need to be extra cautious when operating in uncontrolled field environments and pay extreme attention to radio calls and positions of other aircraft.

Data retrieved from NASA's ASRS site as of April 2012 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.