Suggestion : insert the aircraft type in the subject otherwise You might not get many views on that topic. I believe You are referring to the B737.
Originally Posted by
flyburg
Why is the wheel spin up required? As I read it, weather a wheel spin up is detected or not, the spoilers still deploy under the same conditions! Flight spoilers upon any gear strut compression, ground spoilers on right gear compression!
My shot : if a strut compression is not detected for any reason the wheel spin up logic will trigger the flight spoilers deployment as all other conditions are met thus avoiding a situation of no spoilers deployment at all.