Yellow half circle my aileron in FLT page.

[dirmer3]

What does this mean and how did it happen? How do I fix it?

[kecm80]

hi, take a look back, there are 2 other threads talking about the half circle, as far as i know it appears with no reason since in the failure menu ther was no active one, happend to me 2 times

[sunake]

It probably happens because you moved the controls before hydraulic power is applied. 

I haven't experienced it yet but you can get rid of it by powering down the aircraft completely (the fms should save all its data for a little while). 

Or, you can try to pull and reset circuit breaker CB3-C6. I don't know if that will work but try it. 

[kecm80]

hi, in my case no, i tried to move surfaces whith hydraulic system off and wasn't able to replicate since i no longer see this "bug" 

one time it showed up after sps test, and pulling CB out did not resolved, got half corcle on both sides

on time only left but sincerely can't remember when it lit on

[CaptCrash]

The aileron pcu jam can be triggered when you move the flight controls and there is some hyd pressure in the system but no pumps on. The simple fix is a power cycle of the aircraft to reset the jam sensor.