The game loses TIR for some reason on some flights in mid flight and there is no way to recover it. What TIR shows is that it is "Disabled" and the camera refuses to read the lights.
The only way to bring it back is to restart TIR which makes it impossible for the game to pick it up again without restarting the game too.
As a object lesson how to create concentric rings of suckage, in the past it was easy to default back to the view keys programmed on the throttle. However since the AH3 change that makes TIR the priority, the only views that work are on the keyboard itself. That works to land but requires setting up the rig completely for fighting.
Again, the easy method is to make the view keys the priority over TIR. It is a simple priority switch and the majority of the user base is well used to AHII. Unfortunately, still not seeing how the new set up is an improvement in any way.
Alternate method would be an in-game switch to reacquire TIR which might be useful but that seems much more work than the priority switch.
Thanks!