Originally Posted by
treetop flyer
Switch in FLIGHT:
On the ground (WOW) with the Power Levers at idle, the spoilers would be UP...this could occur either clearing the runway after landing OR taxiing onto the runway to hold in position. As soon as the power levers are advanced for T/O (and above the Microswitch at approx. 19% TQ) the PSEU sends a signal to retract the spoilers.
The Q200's didn't have the switch but I'm told the Q400 does.
Only a little addition: the switch in flight, power levers near flight idle and weight on wheels causes spoilers to deploy once all wheels are on the ground during landing. They will remain deployed until the switch is taken to taxi.
The 200s and 300s do not have the switch because they do not have ground mode operation of the flight spoilers. No spoilers deploy on landing in those airplanes.