Today’s Aeronautical Maintenance Terms

The range of operation of a turboprop powerplant used for in-flight approach and ground handling of the engine and aircraft. Typically, the Beta mode includes operations from 65% to 95% of the engine’s rated rpm.
[Source FAA-H-8083-30B AMT Powerplant Handbook]

A value used in a mathematical computation that is the same every time it is used. For example, the relationship between the length of the circumference of a circle and the length of its diameter is a constant, 3.1416. This constant is called by the Greek name of Pi (π).
[Source FAA-H-8083-30B AMT Airframe Handbook]

A vector quantity that expresses both the speed an object is moving and the direction in which it is moving.
[Source FAA-H-8083-30B AMT Powerplant Handbook]

The system of measurement of wire size used in aircraft electrical systems.
[Source FAA-H-8083-30B AMT Airframe Handbook]

Structural Repair Manual.
[Source FAA-H-8083-30B AMT Airframe Handbook]

ATC Transponder
[Source Acceptable Methods Techniques, and Practices—Aircraft Inspection and Repair]