The Shuttle landing gear is spring/gravity deployed with a pyro backup...
... that fired on every single landing ever done by any space shuttle, since not getting the gear down falls in the way-not-good category for crew survival. You're right that they were technically a "backup," but they weren't contingency based, they fired every time.
For starters, they had no business putting the shuttle on the side of the first stage. It should have been on the top from the start. That simple design change would have saved us a shuttle.
Well, it _was_ on the top from the start. Then budgets got cut, structures had to be lightened, and the only way to make the damn thing go up at all was to put it on the side. The amount of smug coming from your post should at least align with the amount of fact contained therein. Reference: Chris C. Kraft.
An authority is a person who can tell you more about something than you really care to know.