Because the rudder trim controls the rudder and would

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Because the rudder trim controls the rudder and would not provide correction for the out of trim wing.12. Why do control surfaces need to be balanced?An incorrectly balanced surface can develop flutter & rip off the airframe.13. Explain the difference between leading edge flaps, slots and slats?Leading edge flaps increase the maximum lift coefficient that a wing can attain. Slotsincreases the lift coefficient a good deal more than the simple flap. Slats are used on many high-performance airplanes, they are mounted on tracks so it can extend
outward and create a duct to direct high-energy air down over the surface and delay separation to a very high angle of attack.14. Explain the function of a stall strip and a vortex generator.A stall strip alters the wing’sstallcharacteristics and ensures that thewing rootstalls before thewing tips. Vortex generators are most often used to delay flow separation.19. Using figure 15-37(A), analyze the effect on flight of a broken balance cable between the left and right aileron bellcranks.A balance cable connects both aileron bellcranks, if it is broken aileron functions would be compromised. 21. Rank, in order of seriousness, the breaking of each cable in the airplane that is connected to flight controls.

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