Originally Posted by
johnso29
I always thought it was weird that you have to arm the reversers on the CRJ's. On the ERJ you have them when you touch down, same on the DC9 although the DC9 is slightly older technology!
On the crj, we still have them available with weight on wheels at touchdown. They just need to be armed prior in order for them to be activated. In flight, they are disarmed or "off" I guess to avoid an uncommanded deployment. However, they are not armed to auto-deploy like spoilers.