So in summary, your check of take-off speed and config relies on calculating an APPROACH speed for a different flap setting?? Is that a manufacturer approved process? It certainly isn't for any type I've operated. Allowing for your not especially polite manner, I'm pleased if this works for your type but even if some clever person were to work out similar rules-of-thumb for other types (in my case, A320/1/330) it would offer no protection against, for instance, even a fatally inappropriate flex.
Last edited by ShotOne; 19th Jun 2015 at 08:13.