Plain English Meaning

Trim systems take the steady pressure off the controls so the pilot doesn't have to keep pushing or pulling to hold the aircraft where they want it. Once trimmed, the aircraft will fly in that condition on its own.

Full Definition

Aircraft control systems that relieve the pilot of the need to maintain constant pressure on the flight controls by adjusting small auxiliary surfaces (such as trim tabs) or by repositioning the control surface itself, allowing the aircraft to maintain a desired attitude or flight condition hands-off. Trim is typically for on most aircraft, and for and on more . In -equipped aircraft, trim systems in conjunction with the autopilot to keep the aircraft properly trimmed throughout flight.