Mutt;
thank you for your reply.
as to your either FAA or CAA question, i just quoted the Boeing QRH that has been issued to me in BRU.
i have heard the wedge statement before, but have never seen any "official" statement to that effect. only word of mouth. whereas if it were a genuine article, it should be printed somewhere with some endorsement on it either FAA, CAA or Boeing or Stella Artois.
whatever gain in stopping ability the slush adds, must have an effect on the time and distance it takes to get to V1 at which point one begins to stop OR go.
and since i have had one bite on the line, i will stretch my welcome and bring up another question:
why the limitation for flaps below 20,000?
is it more CL/CG and airflow and pitch control/maybe stabilizer airflow disturbance at that altitude when slow enough to use flaps, or simply an aerodynamic load stress on the flaps themselves?
thanks again!