Skin discoloration can be due to changes in melanin. Melanin is a skin pigment that gives color to the skin. Changes in melanin can also cause skin to be patchy. Treatment for skin discoloration includes using topical treatments.
Winglets increase an aircraft's operating efficiency by reducing what is called induced drag at the tips of the wings. An aircraft's wing is shaped to generate negative pressure on the upper surface and positive pressure on the lower surface as the aircraft moves forward.
A landing gear strut is the portion that holds the wheel assembly to the airplane, and away from the wing or fuselage. Sub-Trim This is a trim function on many computer radios, allowing trim function during set-up, and still allowing the full trim function in flight.