What a pity! I thought CS 707 simulation is vastly improved over their older 727 product. This is very important here because old airliners must be flown exactly according to performance charts due to lack of FMS. Now I must say goodbye to Capitan Sim because it looks like their products still need extensive tweaking made by clients alone even after many patches released so far. It is certainly not a good idea in my view...  :'(

Anyway thanks to Michael2 for explanations and this "warning thread".