Airframe 6

What is laminar flow?. Airflow with high turbulence. Smooth airflow with little mixing. Airflow separated from the wing surface.

What happens to the boundary layer toward the trailing edge?. It becomes thinner and faster. It separates completely. It becomes thicker and less laminar.

Where is laminar flow most likely on a wing?. Near the trailing edge. Near the leading edge. At the wingtips.

Why does the boundary layer form?. Due to pressure altitude. Due to skin friction. Due to humidity levels.

What is the adiabatic lapse rate?. Rate of pressure change with temperature. Temperature increase with altitude. Temperature decrease with altitude.

What happens to center of pressure as angle of attack increases?. Moves toward trailing edge. Moves forward toward leading edge. Does not change.

How is form drag classified?. Induced drag. Parasite drag. Wave drag.

What do vortex generators do?. Reduce engine power. Promote early stall. Delay boundary layer separation.

What reduces spanwise flow across a wing?. Slats. Wing fence. Aileron trim.

What is washout?. Increase in wing incidence at tip. Decrease in wing incidence at tip. Zero incidence change across wing.

What is dihedral?. Downward wing angle. Forward wing sweep. Upward wing angle.

How is dihedral measured?. From the wing tip. From the rear spar. From the front spar.

What is aspect ratio?. Wing area × wingspan. Wingspan² ÷ wing area. Wing chord ÷ angle of attack.

What are the three aircraft axes?. Trim, yaw, pitch. Horizontal, vertical, angular. Lateral, longitudinal, vertical.

Rotation about the lateral axis is controlled by: Ailerons. Elevator. Rudder.

Rotation about the vertical axis is controlled by: Rudder. Ailerons. Elevator.

Rotation about the longitudinal axis is controlled by: Elevator. Flaps. Ailerons.

What is controllability?. Ability to maintain altitude. Smooth response to control input. Ability to withstand turbulence.

What increases lateral stability?. Downwash. Wing dihedral. Elevator trim.

What provides longitudinal stability?. Rudder. Winglets. Horizontal stabilizer.

What is a trim tab?. Tab that moves with pilot input to reduce stick forces. Tab that prevents flutter. Tab that moves opposite to control surface automatically.

What is a balance tab?. Tab that trims the aircraft automatically. Tab that moves opposite to the control surface to reduce forces. Tab that increases drag.

What is a spring tab?. Tab that assists control forces at high speed. Tab that prevents stall. Tab that replaces a trim system.

What is a servo/Flettner tab?. Decorative panel. Tab that increases aircraft drag. Tab that moves to help move the primary control surface.

What is aileron differential?. Down aileron moves more. Up aileron moves more. Both move the same.

What do torque links do?. Reduce friction. Keep wheel aligned. Assist retraction.

What aligns the nosewheel before retraction?. Shimmy damper. Centering cam. Downlock switch.

When should tire pressure be checked?. Immediately after landing. After 30 minutes. After at least 2 hours.

What happens if a fusible plug melts?. Tire can be reused. Tire must be scrapped. Tire is rebalanced.

How are spongy brakes corrected?. Replace master cylinder. Bleed brake system. Replace caliper.