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Old 16th December 2009 | 17:46
  #23 (permalink)  
safetypee
 
Joined: Dec 2002
Posts: 2,776
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From: UK
rudderrudderrat,
It may be more usual for V1 to be greater than Vmcg because Vmcg is defined by Vef. Thence V1min is Vef plus any speed increase during the engine failure recognition period. ref CS 25.107.
In the example given an A319 might be accelerating relatively quickly, thus the 110 kts V1 quoted might equate to a Vmcg less than 108 kts, the Vmca comparison.

For the approach case, is it possible that the ‘Vmca’ quoted is in fact Vmcl - CS 25.149.
If so then in determining this speed a configuration different from takeoff might be relevant (Vmcl given for each landing config or the critical config), and a lower weight (MLW) would be used, hence a different, lower speed.
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