PURPOSE: To obtain high reliability by making dual systems as velocity/load controlling system and temperature controlling system, by facilitating to make consecutive controls even when there is something wrong in one system, and by providing functions of monitoring and managing said dual systems in a start controlling system.

CONSTITUTION: Signals by a detector 2 to detect temperature, velocity, pressure and various contact conditions set on a gas turbine body 1 makes signal transformation by input devices 3aW3c in a controller, input is given to microcomputers 4W6 in AWC systems. Control signals from microcomputers 4, 5 in A and B systems are transmitted through a bus 7 to an output device 8, where they are made signal transformation to drive an actuator 9 in a fuel controller. Information transfer is made between microcomputers through a bus 10a, each information performs communication between man and machine with use of an operation console 11, a display device 12, a typewriter 13 and a host computer 14 by the microcomputer 6 in C system.