737NG Ground Spoiler control system
I read in my old notes that the spoiler mixer opens the ground spoiler control valve as the speedbrake lever is pulled past 29 or 31 degrees. I seem to have used two different numbers, albeit close, for some reason?? If someone could put me straight I'd appreciate.
More surprised I was to read the flight detent is at 40 degrees speedbrake lever angle. If I pull the speedbrake lever to Flight Detent in flight does it actually open the ground spoiler control valve? I know the ground spoilers won't deploy unless gear strut compression opens the interlock valve, but what if there's a failure of the interlock valve? First, are my numbers correct? Second, if they are what's the point of having the ground spoiler control valve open before the Flight detent?
Thanks in advance,