What are the 2 white boxes that can be seen in this photo inside the top of the tail of this CRJ-100 used for? (due aft of the leading edge's top). They look like small actuators that are connected to the larger round disc shaped objects below. Is that what they are... actuators?
Photo © Stephan Kruse
It appears to me from looking at outside photos of CRJ's tails that the horizontal stabilizer's angle of incidence is variable. Are the white boxes/actuators in the photo above what moves this surface?
Photo © Jerry Search
All of the CRJ aircraft versions appear to have a horizontal stabilizer that can move, and an elevator. How do they work regarding pitch changes & trim?
Does the elevator control pitch changes via the cockpit control columns, and the horizontal stab controls fine trim adjustments during cruise flight ....for example?
I'm a little confused about how some airliner's T-Tails work. Especially after reading posts about how the "flying tails" on MD-80 series jets work.