Narrative:

I was the pilot of a light aircraft. Practicing a soft-field takeoff from the right seat; in preparation for a CFI checkride. The second aircraft was being taxied for maintenance purposes with the upper cowling removed. This aircraft was not making any transmissions on the CTAF (common traffic advisory frequency). As we approached rotation speed; approx. 45 mph; the second aircraft taxied onto the active runway. Had I not taken immediate evasive action; a collision may have resulted. Upon seeing the aircraft enter the active runway; I immediately closed the throttle and applied maximum braking. No response or transmissions were made from the other aircraft; which cleared the active and continued taxiing. This is not the first type of event at 15G. Last year; a truck entered the active runway and collided with a cessna 150 that was in the flare. Measures have been taken to ensure pedestrians; motor vehicles; etc; remain off of the runway/taxiway environment. Obviously; we must focus our actions on preventing aircraft from creating a hazard to other aircraft. This would have been prevented if: 1.) proper visual lookout was maintained by the person taxiing the other aircraft; 2.) the person taxiing the other aircraft was making and receiving traffic advisories over the CTAF. As pilots; we must always emphasize the see and avoid concept. Whether operating an aircraft with the intention of flight or not; we must continue to keep a lookout for other air traffic and maintain proper situational awareness at all times.

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Original NASA ASRS Text

Title: Light plane pilot on takeoff roll at uncontrolled airport reports runway incursion by another aircraft taxiing for maintenance. Takeoff is aborted and other aircraft continues on across runway without communication.

Narrative: I was the pilot of a light aircraft. Practicing a Soft-Field Takeoff from the Right Seat; in preparation for a CFI Checkride. The second aircraft was being taxied for maintenance purposes with the upper cowling removed. This aircraft was not making any transmissions on the CTAF (Common Traffic Advisory Frequency). As we approached rotation speed; approx. 45 mph; the second aircraft taxied onto the active runway. Had I not taken immediate evasive action; a collision may have resulted. Upon seeing the aircraft enter the active runway; I immediately closed the throttle and applied maximum braking. No response or transmissions were made from the other aircraft; which cleared the active and continued taxiing. This is not the first type of event at 15G. Last year; a truck entered the active runway and collided with a Cessna 150 that was in the flare. Measures have been taken to ensure pedestrians; motor vehicles; etc; remain off of the runway/taxiway environment. Obviously; we must focus our actions on preventing aircraft from creating a hazard to other aircraft. This would have been prevented if: 1.) Proper visual lookout was maintained by the person taxiing the other aircraft; 2.) The person taxiing the other aircraft was making and receiving traffic advisories over the CTAF. As pilots; we must always emphasize the See and Avoid concept. Whether operating an aircraft with the intention of flight or not; we must continue to keep a lookout for other air traffic and maintain proper situational awareness at all times.

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.