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Welcome to the Dauntless Aviation Glossary!
At Dauntless, our editorial staff maintains the web's largest unified glossary of aviation terms. This glossary is built from a combination of official, quasi-official,
and proprietary sources (including original material that we develop oursselves). Uniquely, we often provide multiple definitions of a given term so that you can find that which best applies
to you. In order to maximize your learning efficiency, this glossary (and similar ones for our international users) is incresingly fully integrated into our aviation learning apps, including
our FAA written test prep and FAA practical test prep software and apps. If you like this glossary,
you'll love them with their polished learning environments and world's best and clearest content (please do give them a try.).
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Arm
| Arm | | | a measurement of distance, in inches, feet, etc., used in weight and balance calculations. Normally only the longitudinal arm is of practical importance. The three axial arms are longitudinal arm, lateral arm, and vertical arm. | | source: FAA Acceptable Methods - Aircraft Inspection and Repair (AC 43.13-1B) |
| | | In aircraft weight and balance, as well as load distribution, it is the distance from the CENTER OF GRAVITY (c/g) to some point. For computations, arms measured forward from the c/g are positive (+n) and those measured aft of the c/g are negtive (-n). | | source: FAA Aerosense Glossary |
| | | The horizontal distance that a part of the aircraft or a piece of equipment is located from the datum. | | source: FAA Aviation Maintenance Technician General Handbook (FAA-H-8083-30) |
| | | (GAMA) The horizontal distance from the reference datum to the center of gravity (CG) of an item. The algebraic sign is plus (+) if measured aft of the datum or to the right side of the center line when considering a lateral calculation. The algebraic sign is minus (-) if measured forward of the datum or the left side of the center line when considering a lateral calculation. | | source: FAA Weight and Balance Handbook (FAA-H-8083-1A) |
| | | The horizontal distance in inches from the reference datum line to the center of gravity of an item. Used in weight and loading calculations. | | source: FAA Weight Shift Control Handbook (FAA-H-8083-5) |
| | | (as a verb) to place a device in an active mode so that it is ready to operate: arm the Vertical Speed mode on the FCU / MCP; the cabin attendant armed the escape slide | | source: ICAO English Pro Aviation Glossary |
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Disclaimer: While this glossary in most cases is likely to be highly accurate and useful, sometimes, for any number of editorial, transcription, technical, and other reasons, it might not be.
Additionally, as somtimes you may have found yourself brought to this page through an automated term matching system, you may find definitions here that do not match the cotext or application in which
you saw the original term. Please use your good judgement when using this resource.
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