Definition
A condition of flight in which all forces acting on the aircraft are in balance, so the aircraft maintains a constant airspeed, altitude, and direction without acceleration in any axis.
Plain English
Flight where nothing is changing — the aircraft is holding its speed, height, and heading steady because all the forces pushing and pulling on it cancel each other out.
Context Anchor
Seen in flight training, aircraft performance discussions, and explanations of climb, cruise, descent, and power settings.
Derivation
From 'steady' (unchanging, constant) and 'state' (a condition of being). Together, 'steady-state' means a condition that is not changing over time. Engineers use the phrase across many fields to describe any system in equilibrium.
Why Pilots Care
Recognizing this condition helps pilots maintain efficient, balanced flight and quickly detect when forces become unbalanced.
Grounding Statement
When the airplane has stopped transitioning and is holding the same condition, it is in steady-state flight.
Intuition Check
Steady does not just mean smooth or comfortable here. It means the aircraft’s flight condition is no longer changing.
Example Sentence 1
Once established in cruise at 6,500 feet, the aircraft was in steady-state flight with thrust matching drag and lift matching weight.
Example Sentence 2
In steady-state flight the four forces remain balanced with no change in speed or direction.