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Aviation Dictionary

Reference:

1 Airplane Flying Handbook
2 Pilot's Handbook of Aeronautical Knowledge
3 Instrument Procedures Handbook
4 Risk Management Handbook
5 Aviation Instructor Handbook
6 Seaplane Handbook
7 Balloon Handbook
8 Aeronautical Information Manual
9 Airplane Flying Handbook
10 Pilot Controller Glossary
11 Glider Handbook

B

Back course (BC)

1 The reciprocal of the localizer course for an ILS. When flying a back-course approach, an aircraft approaches the instrument runway from the end at which the localizer antennas are installed.

5 The reciprocal of the localizer course for an ILS. When flying a back-course approach, an aircraft approaches the instrument runway from the end at which the localizer antennas are installed.

Back side of the power curve

1 Flight regime in which flight at a higher airspeed requires a lower power setting and a lower airspeed requires a higher power setting in order to maintain altitude.

Bailout bottle

12 Small oxygen cylinder connected to the oxygen mask supplying several minutes of oxygen. It can be used in case of primary oxygen system failure or if an emergency bailout at high altitude became necessary.

Balance tab

2 An auxiliary control mounted on a primary control surface, which automatically moves in the direction opposite the primary control to provide an aerodynamic assist in the movement of the control.

Balked landing

1 A go-around.

Ballast

1 Removable or permanently installed weight in an aircraft used to bring the center of gravity into the allowable range.

12 Term used to describe any system that adds weight to the glider. Performance ballast employed in some gliders increases wing loading using releasable water in the wings (via integral tanks or water bags). This allows faster average cross-country speeds. Trim ballast is used to adjust the flying CG, often necessary for light-weight pilots. Some gliders also have a small water ballast tank in the tail for optimizing flying CG.

Balloon

1 The result of a too aggressive flare during landing causing the aircraft to climb.

Baro-aiding

2 A method of augmenting the GPS integrity solution by using a nonsatellite input source. To ensure that baro-aiding is available, the current altimeter setting must be entered as described in the operating manual.

5 A method of augmenting the GPS integrity solution by using a non-satellite input source. To ensure that baro-aiding is available, the current altimeter setting must be entered as described in the operating manual.

Barograph

12 Instrument for recording pressure as a function of time. Used by glider pilots to verify flight performance for badge or record flights.

Barometric scale

2 A scale on the dial of an altimeter to which the pilot sets the barometric pressure level from which the altitude shown by the pointers is measured.

5 A scale on the dial of an altimeter to which the pilot sets the barometric pressure level from which the altitude shown by the pointers is measured.

Basic empty weight (GAMA)

1 Basic empty weight includes the standard empty weight plus optional and special equipment that has been installed.

2 Basic empty weight includes the standard empty weight plus optional and special equipment that has been installed.

Basic need

7 A perception factor that describes a person’s ability to maintain and enhance the organized self.

BC

2 See back course.

5 See back course.

Behaviorism

7 Theory of learning that stresses the importance of having a particular form of behavior reinforced by someone other than the learner to shape or control what is learned.

Bernoulli’s Principle

2 A principle that explains how the pressure of a moving fluid varies with its speed of motion. An increase in the speed of movement causes a decrease in the fluid’s pressure.

Best angle of climb (VX)

1 The speed at which the aircraft will produce the most gain in altitude in a given distance.

Best glide

1 The airspeed in which the aircraft glides the furthest for the least altitude lost when in non-powered flight.

Best glide speed (best L/D speed)

12 The airspeed that results in the least amount of altitude loss over a given distance. This speed is determined from the performance polar. The manufacturer publishes the best glide (L/D) airspeed for specified weights and the resulting glide ratio. For example, a glide ratio of 36:1 means that the glider will lose 1 foot of altitude for every 36 feet of forward movement in still air at this airspeed.

Best rate of climb (VY)

1 The speed at which the aircraft will produce the most gain in altitude in the least amount of time.

Biplanes

2 Airplanes with two sets of wings.

Blade face

1 The flat portion of a propeller blade, resembling the bottom portion of an airfoil.

Bleed air

1 Compressed air tapped from the compressor stages of a turbine engine by use of ducts and tubing. Bleed air can be used for deice, anti-ice, cabin pressurization, heating, and cooling systems.

Bleed valve

1 In a turbine engine, a flapper valve, a pop off valve, or a bleed band designed to bleed off a portion of the compressor air to the atmosphere. Used to maintain blade angle of attack and provide stall-free engine acceleration and deceleration.

Block altitude

2 A block of altitudes assigned by ATC to allow altitude deviations; for example, “Maintain block altitude 9 to 11 thousand.”

5 A block of altitudes assigned by ATC to allow altitude deviations; for example, “Maintain block altitude 9 to 11 thousand.”

Bookmark

7 A means of saving addresses on the World Wide Web (WWW) for easy future access. Usually done by selecting a button on the web browser screen, it saves the current web address so it does not have to be input again in a lengthy series of characters.

Boost pump

1 An electrically driven fuel pump, usually of the centrifugal type, located in one of the fuel tanks. It is used to provide fuel to the engine for starting and providing fuel pressure in the event of failure of the engine driven pump. It also pressuri

Branching

7 A programming technique which allows users of interactive video, multimedia courseware, or online training to choose from several courses of action in moving from one sequence to another.

Briefing

7 An oral presentation where the speaker presents a concise array of facts without inclusion of extensive supporting material.

Buffeting

1 The beating of an aerodynamic structure or surface by unsteady flow, gusts, etc.; the irregular shaking or oscillation of a vehicle component owing to turbulent air or separated flow.

Building block concept

7 Concept of learning that new knowledge and skills are best based on a solid foundation of previous experience and/or old learning. As knowledge and skills increase, the base expands, supporting further learning.

Bus bar

1 An electrical power distribution point to which several circuits may be connected. It is often a solid metal strip having a number of terminals installed on it.

Bus tie

1 A switch that connects two or more bus bars. It is usually used when one generator fails and power is lost to its bus. By closing the switch, the operating generator powers both buses.

Bypass air

1 The part of a turbofan’s induction air that bypasses the engine core.

Bypass ratio

1 The ratio of the mass airflow in pounds per second through the fan section of a turbofan engine to the mass airflow that passes through the gas generator portion of the engine. Or, the ratio between fan mass airflow (lb/sec.) and core engine mass air

2 The ratio of the mass airflow in pounds per second through the fan section of a turbofan engine to the mass airflow that passes through the gas generator portion of the engine.