Well, in this case your 'trigger' is the 'else' condition, which won't run until FLogo.Y < 175.
Just move "Timer < 100" to being a sub-event for the else condition, instead of a sub-event for 'trigger once'. You need that event to run 100 times to fade in. If it's a sub-event under 'trigger once' then...it'll only run once.