What is the Tire Limit Speed (ground speed) for the aircraft?

• A. 182 Knots Ground Speed
• B. 180 Knots Ground Speed
• C. 185 Knots Ground Speed
• D. 182 Knots Indicated Airspeed

Answer: (A)

Tire Limit Speed on the ground is the maximum safe speed at which the aircraft’s tires can rotate while the plane is on the surface. This limit is given in knots ground speed because it’s about wheel rotation relative to the ground, not the air around the aircraft. The tire’s rating depends on wheel RPM, which translates to a specific ground speed when the aircraft is moving on the ground.

For the CRJ-550, the tire limit on the ground is 182 knots. This means you should never exceed 182 knots as the aircraft’s ground speed to avoid over-stressing the tires, especially during braking or high-load taxi. Note that this limit is expressed in ground speed, not indicated airspeed, so a value like 182 knots indicated airspeed would not be applicable.