AMTStandards.orgAviation maintenance

Arm

The horizontal distance that a part of the aircraft or a piece of equipment is located from the datum.

Aviation Maintenance Technician Handbook — General, p. G-2

Also defined in 2 more sources

(GAMA) The horizontal distance from the reference datum to the 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.

Aircraft Weight and Balance Handbook, p. G-1

See moment arm.

Pilot's Handbook of Aeronautical Knowledge, p. G-4

Taught in GEN-C Procedures, GEN-C Concepts, GEN-C Quick reference, GEN-H Concepts, GEN-J Procedures, AF-J Concepts and 5 more.