ATPL Principles of Flight - Control Exam 100% Solved Correctly

ATPL Principles of Flight - Control Exam 100% Solved Correctly Pitching - Answer- rotation around the lateral axis (and is related to longitudinal stability) Rolling - Answer- rotation around the longitudinal axis Yawing - Answer- rotation around the normal (vertical axis) To pitch up - Answer- back pressure on control column = elevator moves up + negative camber of tailplane/elevator increases (to provide downforce) Trimmable horizontal stabiliser (forward CG) - Answer- requires stabiliser to produce more downforce therefore lower stabiliser AoA needed Trimmable horizontal stabiliser (aft CG) - Answer- less nose down pitching moment from the wing - stabiliser does not need to produce as much down force - so stabiliser leading edge higher In trim - Answer- elevator will have no deflection in relation to the aerofoil Positive Angle of Incidence (Stabiliser) - Answer- stabiliser will give greater nose down pitching moments Internal Balance - Answer- flexible seal - uses pressure differentials within a sealed cavity forward of the hinge line Horn balance - Answer- part of control surface located ahead of the hinge line to protrude in the airflow Balance tab - Answer- deflect in opposite direction to main control Anti-balance tab - Answer- deflect in same direction to main control, for light control forces to increase control forces Trim tab - Answer- Once set a trim tab does not change its position relative to the control surface when that surface moves Servo tab - Answer- pilot's control input goes directly to the tab and control deflection carried out by the aerodynamic forces generated by the tab Spring tab - Answer- spring introduced into the control linkage to change stick forces at high speed. At high speeds, the spring stretches and deflection of the tab begins Adverse Yaw - Answer- aircraft yaws opposite to the intended roll (e.g. roll right → yaw left) Differential Ailerons - Answer- Downgoing aileron deflects less than the upgoing aileron, balances drag, aircraft yaws in correct direction. "Up more, down less." (Aileron deflection is upwards on the downgoing wing)