Definition
The highest indicated airspeed at which an aircraft may be operated when flying through turbulent air. It is set below the structural cruising speed to ensure that a sudden gust load will not exceed the aircraft's structural limits. This speed is commonly published in the Pilot's Operating Handbook as Vₐ (maneuvering speed) or Vₙ₀ (maximum structural cruising speed in rough air), depending on the aircraft.
Plain English
The fastest you should fly when the air is bumpy. Going faster than this in turbulence risks damaging the airframe because a strong gust hitting the wings at high speed creates loads the structure isn't designed to handle.
Context Anchor
Seen on airspeed indicator color-code diagrams, especially at the top of the green arc before the yellow caution range begins.
Why Pilots Care
Flying faster than this limit in rough air can cause excessive loads that bend or damage the wings and structure.
Analogy
It is like slowing a car down on a rough road. The car may be able to go faster, but the bumps hit much harder at higher speed.
Intuition Check
Do not read “maximum” as the airplane’s absolute top speed. Here it means the highest speed appropriate for rough air; higher speeds may be allowed only in smooth air and with caution.
Example Sentence 1
When we hit moderate turbulence over the mountains, I reduced power and slowed to the maximum airspeed for rough air before continuing on course.
Example Sentence 2
The aircraft handbook lists the maximum airspeed for rough air as 112 knots indicated.