I have a plane that is constantly flying right with gravity using the event tick, but I want the plane to fly right for 3 seconds, then enable gravity. Essentially I want to be able to move right only on begin play, but not trigger the event tick until 3 seconds after begin play.
I think the easiest thing to do would be to create a boolean variable, bIsActive or something like that. Set it as false for a default, then set a timer in BeginPlay. Use the timer to call an event to set bIsActive to true.
In your tick event check the bIsActive value, and only perform the rest of the functionality if it is true.