|Quoting 320tech (Reply 3):|
This is correct. On the -100 series, at least, and I think on all others, there is a magnetically locked switch on the glare shield called the "Flight / Taxi" switch. On the ground, the pilot puts the switch into Taxi, locking the spoilers down. Prior to take off, the pilot sets the switch to Flight, and the spoilers extend.
This is true, but it's a feature only for the Dash 8-100 and the Q400 Series.
As per the Q400 AOM, the spoilers extend if:
- The FLIGHT/TAXI switch is in the FLIGHT position
- Both power levers are set to less than FLIGHT IDLE + 12º
- WOW (Weight on Wheels) indicates the airplane is on the ground.
For the -100 it's exactly the same, but I'm not sure about the 12º.
Basically, the switch is set to TAXI after landing to retract the spoilers, and remains in that position until the next takeoff. During the procedures before takeoff, the switch is taken to the FLIGHT position. At this time you will have the spoilers extend momentarily until you advance the power levers for takeoff.
The switch is held by a solenoid in the TAXI position, and it is de-energized if you advance the power levers past the threshold (12º for the Q400). Therefore, if you forget to move the switch to the FLIGHT position, it will snap to the FLIGHT position while applying power. It's a real Tell-On-The-Forgetful-F/O feature
It caught me a couple of times on the -100.