1. Method for disabling a turbine blade position lock for permitting a change in position of the turbine blade, comprising the steps of: fuzzifying (10a) a first plurality of engine command and condition signals (16, 18, 20, 22, 24) and outputting a first plurality of engine command and condition fuzzy set signals (16a, 18a, 20a, 22a, 24a); applying a first plurality of fuzzy rules (10b) to the first plurality of command and condition fuzzy set signals, and outputting a position lock disable request fuzzy set signal (26); defuzzifying (28) the position lock disable request fuzzy set signal (26) and outputting a defuzzified position lock disable request signal (30); fuzzifying (12a) a second plurality of engine condition signals (40, 46, 52, 54) and outputting a second plurality of engine condition fuzzy set signals (40a, 46a, 52a, 54a); applying a second plurality of fuzzy rules (12b) to the second plurality of engine condition fuzzy set signals and, in response to the position lock disable request fuzzy set signal (26), outputting a position lock disable fuzzy set signal (60); and defuzzifying (62) the position lock disable fuzzy set signal (60) and outputting a defuzzified position lock disable signal (64) for said disabling said turbine blade position lock for permitting a change in position of said turbine blade.