Definition
The rear assembly of an airplane, also called the empennage, that provides stability and control. It typically consists of a horizontal stabilizer with an elevator (for pitch control) and a vertical stabilizer with a rudder (for yaw control).
Plain English
The back end of the airplane, made up of the small fixed and moving surfaces that keep the airplane pointed steadily and let the pilot control its up-and-down and side-to-side movement.
Context Anchor
Seen during preflight inspections and in descriptions of airplane lights, especially the rear white light.
Derivation
From Old English 'tægel,' meaning the rear appendage of an animal. Borrowed into aviation because the rear surfaces of an aircraft sit behind the main body in the same way an animal's tail does, and they help steady the airplane the way a tail helps an animal balance.
Why Pilots Care
The tail surfaces are what keep the airplane flying straight and level on their own and what let the pilot control pitch and yaw. Damage, ice, or improper loading affecting the tail directly affects controllability.
Intuition Check
Tail does not mean an animal-like appendage or only the very tip of the airplane. In aviation, it means the rear section of the airplane; in a lighting context, it often points to the location of the rear white light.
Example Sentence 1
During preflight, the pilot walked to the tail and checked that the elevator and rudder moved freely.
Example Sentence 2
The white position light on the tail helps other pilots see the airplane from behind at night.