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Flaperon Control System
AUTOPILOT ACTUATOR

Aviation Structural Mechanic (H&S) 3&2 - How airplanes are built and how to maintain them
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maintained flush with the wing. When the flaperon pop-up cylinder is actuated, the gearing mechanism transmits pop-up motion to each wing flaperon power actuator. The semiautomatic flaperon pop-up device aids in reducing ground roll during landing. The pop-up system is activated by the pilot placing the flaperon pop-up switch in the ARM position. All flaperons (four) will then automatically pop up approximately 41 degrees when the aircraft weight is on the landing gear and the throttles are retarded. A mechanical interlock device prevents damage to the flaperons during folding of the wings. When the wings are folding, the flaperons cannot be extended. In addition, the folding operation cannot start unless the flaperons are flush with the wings. A wing-fold interlock prevents flaperon pop-up after the wings are folded. A fail-safe spring returns the flaperons to the flush position in case the combined hydraulic system or electrical system should fail. The eddy current damper links mechanically to a bell crank in the flaperon control linkage. See figure 9-11. It dampens any rapid left or right control stick movement by producing an opposing force proportional to the speed at which the stick is moved. The damper contains permanent magnets, a rotating copper disc, a gear train, and a clutch assembly. Control stick motion rotates the clutch and gear train, which, in turn, rotates the copper disc. The copper disc is sandwiched in the air gap between the six permanent magnets and a flux plate. As the copper disc revolves, the magnetic field between the magnets and the flux plate is disturbed, causing an opposing force (eddy currents) that tries to stop the disc. The opposing force is proportional to the speed of the rotating disc and to the speed of stick movement. The clutch will slip at a force of 275 to 325 inch-pounds to prevent control stick binding if the damper jams. Figure 9-11.—Eddy current damper. 9-13







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