PPRuNe Forums - View Single Post - Airbus Approch Speed: VLS versus 'S' Speed
Old 9th Feb 2017, 05:50
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vilas
 
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In airbus we don't think of stall but triggering protection. Quoted below is from airbus presentation on the subject:


Manoeuvring capability
  • At V2, one engine out: stabilised turn at 30 degrees bank before alpha max.
  • At V2+10 all engines operative: Stabilised turn at 40 degrees before alpha floor.
  • At green dot: Stabilised turn at 45 degrees bank before alpha prot.
  • At Vls (final take off up to landing):Stabilised turn at 40 degrees before alpha floor.
General rule: fly approach manoeuvres at the manoeuvre speed minimum.
However if ATC speed constraint:
  • Selected speed
  • Possible to fly below manoeuvring speed down to Vls. It enables standard manoeuvres.
Margin versus alpha prot is reduced.
Margin could become small in turbulent conditions, or with high bank angles.
If such conditions are anticipated consider CONF change.
  • Resume to managed speed when out of ATC constraint.

Last edited by vilas; 10th Feb 2017 at 06:07.
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