GA pilot reported a near midair collision after another aircraft entered the runway and took off as ...

Attributes
ACN	1750230
Time
Date	202007
Local Time Of Day	0601-1200
Place
Locale Reference	AWO.Tower
State Reference	WA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Small Aircraft
Operating Under FAR Part	Part 91
Flight Phase	Final Approach
Route In Use	Direct Visual Approach
Flight Plan	None
Aircraft 2
Make Model Name	Small Aircraft
Operating Under FAR Part	Part 91
Flight Phase	Takeoff
Person 1
Function	Single Pilot Pilot Flying
Qualification	Flight Crew Student
Experience	Flight Crew Last 90 Days 50 Flight Crew Total 66 Flight Crew Type 45
Events
Anomaly	Conflict Ground Conflict Critical
Miss Distance	Horizontal 0 Vertical 300

Narrative:

I entered the pattern on a 45 for right downwind and was flying a normal pattern for landing at arlington on 16. When I was on short final approx 500' from the threshold and 300' AGL [aircraft Y] crossed the hold short line and rolled onto runway 16. As he crossed the hold short line I made a radio call announcing go around; said aircraft on the runway don't take off and applied full power. [Aircraft Y] continued onto the runway and began his takeoff roll. I deviated right of center so I could keep him in sight and he climbed out and turned right crosswind approximately 500' below me without making any radio call. I was talking to other planes in the pattern so my radios were working. I was in full power climb so went well above traffic pattern altitude to make sure I was clear of the other pilot that clearly wasn't looking or listening.this event was entirely human failure on the other pilot. I was short final with my landing lights on and was making appropriate radio calls. I suspect his radio was not working. Additionally he was not adsb out equipped; I got his tail number visually.

Original NASA ASRS Text

Title: GA Pilot reported a NMAC after another aircraft entered the runway and took off as the reporter was landing.

Narrative: I entered the pattern on a 45 for right downwind and was flying a normal pattern for landing at Arlington on 16. When I was on short final approx 500' from the threshold and 300' AGL [Aircraft Y] crossed the hold short line and rolled onto runway 16. As he crossed the hold short line I made a radio call announcing go around; said aircraft on the runway don't take off and applied full power. [Aircraft Y] continued onto the runway and began his takeoff roll. I deviated right of center so I could keep him in sight and he climbed out and turned right crosswind approximately 500' below me without making any radio call. I was talking to other planes in the pattern so my radios were working. I was in full power climb so went well above traffic pattern altitude to make sure I was clear of the other pilot that clearly wasn't looking or listening.This event was entirely human failure on the other pilot. I was short final with my landing lights on and was making appropriate radio calls. I suspect his radio was not working. Additionally he was not ADSB out equipped; I got his tail number visually.

Data retrieved from NASA's ASRS site 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.

GA pilot reported a near midair collision after another aircraft entered the runway and took off as the reporter was landing.