When I use the Instant Replay function in FSX, the spoilers never deploy, and I also can't detect the subtle sound change when the propellors switch to reverse pitch. I have armed the spoilers before take off, and they seem to deploy when I am actually landing the plane (the green light appears, and I can hear the sound of the reverse propellor pitch). Is this normal with the Jetstream 4100?

I think it's to complex for FSX instant replay :) Try turning off engines on ground and watch Your landing again...