Plain English Meaning

The one instrument the pilot looks at to see if the airplane is flying straight through the air rather than skidding sideways. In a glass cockpit, that's the small indicator just below the bank pointer that shows whether the airplane is in coordinated flight.

Full Definition

On an electronic flight display, the instrument that gives the most direct, immediate, and accurate indication of the airplane's yaw condition during a specific maneuver. For coordinated flight, the slip/skid indicator (the trapezoid or ball beneath the bank pointer on the attitude indicator) is the primary yaw instrument, showing whether the airplane's nose is aligned with its .