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For the approach chart,the approach speed category have cat A B C D ,and I know that speed is base on 1.3 Vs0 at the ,maximum certificated landing weight,but why is 1.3 Vs0 not 1.4 or 1.5?

1 Answers

  1. Kris Kortokrax on Feb 23, 2015

    It was an arbitrary choice, giving some margin above stalling speed without using too high a number. Vref is the reference landing speed and in the absence of a published number from the manufacturer is calculated at 1.3 Vso. 14 CFR 23.73 states that Vref cannot be less than 1.3 Vs0.

    Note that if you fly the approach at a higher speed, you must use the minima for the appropriate category.

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