MAC262 – ACFT Limits And Speeds Practice Test

What is Vapp and how is it chosen relative to Vref?

Vapp is the target approach airspeed selected to maintain stabilized approach with margins relative to Vref. Vapp is chosen to maximize glide ratio. Vapp equals Vref. Vapp is the minimum landing speed.

Correct Answer:

Vapp is chosen to maximize glide ratio.

Explanation:

Vapp is the approach airspeed you fly during the approach that is chosen to optimize glide performance. In practice, the speed is selected to give the best lift-to-drag ratio, which means the greatest glide distance for the aircraft in an engine-out scenario. This makes Vapp the speed you’d use to maximize how far you can glide from a given altitude while still being able to manage the approach safely. Relating it to Vref, Vref is the reference landing speed used to set the target on final approach in the landing configuration. Vapp is chosen with that reference in mind but is not the same as Vref; it is typically set to a value that provides the best glide efficiency (and thus energy management) while still allowing a stabilized approach and a safe margin above stall.

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