I suppose this is the equivalent of what we used to call the tech log. It shows that the aircraft has just had an air test on September 21st following replacement of much of the tailplane. This was due to damage caused by propellor wash from B17s which the P40 had sustained during simulated attacks. On the day of the accident the aircraft was once again tasked to do this but crashed before the exercise started. Note RAF engineers' involvement. Still RAF Bovingdon at the time.