Definition
A horizontal tail surface built as a single, continuous moving panel that pivots as a whole to provide pitch control, rather than being split into a fixed stabilizer with a separate hinged elevator attached to its trailing edge. On airplanes equipped this way, the entire surface rotates about a lateral pivot point in response to control wheel or stick inputs. This configuration is the defining feature of a stabilator.
Plain English
The horizontal tail is one solid piece that tilts up and down as a unit to make the airplane's nose pitch up or down. There is no separate small flap on the back of it -- the whole thing moves.
Context Anchor
Seen in flight control system descriptions, especially when explaining a stabilator on the tail of an airplane.
Why Pilots Care
It combines the jobs of stabilizer and elevator into one moving surface, reducing parts while giving direct pitch response on many light aircraft.
Intuition Check
Do not assume this means a normal fixed horizontal stabilizer with an elevator attached. In this context, one-piece means the whole horizontal tail surface moves together.
Example Sentence 1
Because the Cherokee uses a one-piece horizontal stabilizer, the instructor warned the student to make smaller pitch inputs during the flare.
Example Sentence 2
In turbulence the pilot felt the one-piece horizontal stabilizer respond immediately to small control inputs.