Glossary

Glossary A ADC. See air data computer. 14 CFR. See Title 14 of the Code of Federal Regulations. ADF. See automatic direction finder. 100-hour inspection. An inspection identical in scope to ADI. See attitude director indicator. an annual inspection. Conducted every 100 hours of flight on aircraft of under 12,500 pounds that are used to carry Adiabatic cooling. A process of cooling the air through passengers for hire. expansion. For example, as air moves up slope it expands with the reduction of atmospheric pressure and cools as it expands. Absolute accuracy. The ability to determine present position in space independently, and is most often used by pilots. Adiabatic heating. A process of heating dry air through compression. For example, as air moves down a slope it is Absolute altitude. The actual distance between an aircraft compressed, which results in an increase in temperature. and the terrain over which it is flying. Adjustable-pitch propeller. A propeller with blades whose Absolute pressure. Pressure measured from the reference pitch can be adjusted on the ground with the engine not of zero pressure, or a vacuum. running, but which cannot be adjusted in flight. Also referred to as a ground adjustable propeller. Sometimes also used to A.C. Alternating current. refer to constant-speed propellers that are adjustable in flight. Acceleration. Force involved in overcoming inertia, and Adjustable stabilizer. A stabilizer that can be adjusted in which may be defined as a change in velocity per unit of time. flight to trim the airplane, thereby allowing the airplane to fly hands-off at any given airspeed. Acceleration error. A magnetic compass error apparent when the aircraft accelerates while flying on an easterly or westerly ADM. See aeronautical decision-making. heading, causing the compass card to rotate toward North. ADS-B. See automatic dependent surveillance-broadcast. Accelerate-go distance. The distance required to accelerate to V with all engines at takeoff power, experience an engine 1 Advection fog. Fog resulting from the movement of warm, failure at V , and continue the takeoff on the remaining 1 humid air over a cold surface. engine(s). The runway required includes the distance required to climb to 35 feet by which time V speed must be attained. 2 Adverse yaw. A condition of flight in which the nose of an airplane tends to yaw toward the outside of the turn. This is Accelerate-stop distance. The distance required to accelerate caused by the higher induced drag on the outside wing, which to V with all engines at takeoff power, experience an engine 1 is also producing more lift. Induced drag is a by-product of failure at V , and abort the takeoff and bring the airplane to 1 the lift associated with the outside wing. a stop using braking action only (use of thrust reversing is not considered). Aerodynamics. The science of the action of air on an object, and with the motion of air on other gases. Aerodynamics Accelerometer. A part of an inertial navigation system deals with the production of lift by the aircraft, the relative (INS) that accurately measures the force of acceleration in wind, and the atmosphere. one direction. G-1