PA-28R Cherokee Arrow All Series
Flight Crew Commercial; Flight Crew Instrument
Flight Crew Last 90 Days 25; Flight Crew Total 4600; Flight Crew Type 3500
Workload; Time Pressure
Conflict Ground Conflict; Critical
Flight Crew Took Evasive Action
Human Factors
While departing ZZZ Runway XX; and after making appropriate radio announcements and visually assessing the runway condition; at approximately 50Kts and half way down the runway; an unknown twin engine Cessna aircraft entered the runway at the XY end of the runway without announcement. I was forced to take evasive action and reconfigure the aircraft on the roll from a normal takeoff to a short field takeoff to avoid the other aircraft on the runway. At the time; Runway XX was the active runway and wind conditions favored this runway. I was departing Runway XX directly after another aircraft who departed 60 seconds before me utilizing the same runway. I had landed at ZZZ 20 minutes previously utilizing Runway XX. There was no doubt that Runway XX was being used by all of the landing; departing and pattern aircraft at the time. The offending pilot did not respond to radio calls from me either while on the roll (warning) or after I passed the aircraft; clearing it by 100 feet. I am not sure how to locate the pilot operator; however; he should be counseled or cited for this runway incursion.
PA-28R Cherokee Pilot reported an NMAC event during takeoff roll with a nordo aircraft that initiated an opposite direction takeoff.