Airframe 4

Where does the boundary layer form?. On the lower surface of the wing only. Along 1/3 of the upper surface of the wing. Only at the wingtip.

How soon does a stall warning device sound before the aircraft actually stalls?. 2–3 knots above stalling speed. 5–10 knots above stalling speed. 15–20 knots above stalling speed.

What is the name of the width measurements from either right or left of the vertical line through the aircraft?. Butt line (Buttock Line) measurements. Waterline measurements. Centerline measurements.

What is burbling?. Smooth laminar airflow. Turbulent airflow (eddying). Propeller wash effect.

Airfoils that are installed perpendicular to the wing are called?. Spoilers. Vortex generators. Flaperons.

What is the aspect ratio of a non-rectangular airfoil?. Span² / area. Chord × thickness. Wing area / span.

Define load factors. The loads imposed on the wing in flight. Ratio of wing lift to drag. Weight of the aircraft divided by fuel load.

What is a cantilever wing?. A wing with external bracing. A wing with no strut or external bracing. A folding wing.

What is offset?. The difference in airfoil thickness. Angular difference between MACs of biplane wings. Distance between wing root and tip.

10. What is the camber of an airfoil?. The curvature of the airfoil surface. The thickness of the trailing edge. The angle of incidence.

11. How is hedral measured?. On the front spar. On the rear spar. From wingtip to wingtip.

What is meant by forward stagger?. Upper wing leading edge is behind lower wing. Upper wing leading edge is ahead of lower wing. Upper wing and lower wing aligned.

Where are slots located?. At the wing root only. Ahead of the ailerons on the outboard part of the wing. On the horizontal stabilizer.

What is meant by wash out?. Increasing angle of incidence along the wing. Decreasing angle of incidence along the wing. Leveling wing chord.

What is a drag wire?. Wire that strengthens the wing truss diagonally from inboard forward spar to outboard rear spar. Wire to adjust aileron trave. Wire that carries fuel to wing tanks.

What is an anti-drag wire?. Opposite of drag wire. Wire for elevator trim. Wire for rudder linkage.

Can dihedral be adjusted on an aircraft?. No – not normally. Yes – by pilot in flight. Yes – with wing flaps.

Where is wing station zero measured from?. Leading edge of wing. From Butt Line (Buttock Line) Zero. Wingtip.

What does the stall warning indicate?. 5–10 knots above stall speed (in MPH and % of speed before stall). 20 knots below stall speed. Exact stall speed only.

Are integral tanks part of an aircraft structure?. No, they are separate fuel bladders. Yes. Only in small aircraft.

What is the advantage of a Fowler flap when compared to a split flap?. Increases wing area and drag. Decreases stall speed without affecting drag. Reduces wingtip vortices.

Do you want to stop air from flowing over the wing?. Aileron. Wing fence. Spoiler.

What are the normal Center of Pressure travel limits of an aircraft wing?. 10–20% of MAC. 30–40% of MAC (3/10 to 4/10). 50–60% of MAC.

What are integral fuel tanks used for?. Temporary fuel storage. Part of the aircraft structure. Only for auxiliary fuel.

Direct input to a tab from the pilot is called what type of tab?. Trim tab (Flettner Tab). Balance tab. Spring tab.

Which tab helps the pilot to steer?. Trim tab. Balance tab. Servo tab.

What does the spring tab do?. Provides a boost and aids the pilot in moving the control surface. Moves opposite to the control to balance loads. Locks the control surface in place.

What does a Flettner tab do?. Provides additional lift. Moves opposite to the control to aid the pilot. Adjusts flap extension.

What causes the aircraft to turn around the lateral axis?. Rudder. Elevators. Ailerons.