Out Of Control

"Out of control" ( OOC ) or "driven it down out of control" was a special kind of aerial victory, credited to British pilots of RFC and RNAS during First World War. In 1917 British decided that aerial war will be moved over the enemy territory, so RFC and RNAS pilots had to start war patrols over enemy territory, which was much more dangerous than flying over own lines. Because of most actions taking place over German held territory British pilots, had small chance of having claims confirmed because no access to wrecks or bodies. British pilots could only hope that the enemy aeroplane that went spinning down into could could eventually crashed, unseen by them. So such claim, if it was confirmed by some witness ( another pilot ) was scored as aerial victory. The fact that pilots of both sides readily put their aircraft into a spin if they found themselves in a tight spot often seems to have been overlooked.
From modern point of view "out of control" was very similar to "probable victory" which we knows from second war. For rest of sides of Great War - this kind of victory wasn't accepted. French were only noted "probable victories" but they were not counted as really victories. So for example some French ace was credited with 10 victories and 4 probable victories.
The plane on the picture presents PUP no A7327 ( Squadron no 46 ) which was piloted by Capt. Stuart Harvey Pratt ( 1893- ? ) Pratt led C Flight and he claimed all five of his Pup victories in this plane between 25 May and 17 June 1917 and all his victories were "OOC" victories.