Reference Speed (Vref)
Reference Speed (Vref)
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24.Jun.2022
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SKYbrary Aviation Safety. (June 24, 2022). Reference Speed (Vref).
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Definition
1.3 times the stalling speed in the stated landing configuration and at the prevailing aircraft weight. This is the speed required as the landing runway threshold is crossed at a height of 50 feet in landing configuration if the calculated aircraft performance is to be achieved.
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- Accelerate Stop Distance Available (ASDA)
- Aircraft Performance
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- Lift-off Speed (VLOF)
- Normal Operating Speed (maximum) (Vno)
- Rotation Speed (Vr)
- Stall Speed (Vs)
- Take Off Distance Available (TODA)
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- Minimum Control Speed (air) (Vmca)
- Never Exceed Speed (Vne)
- Minimum Control Speed (ground) (Vmcg)
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