PURPOSE: To make highly accurate fuel control attainable, by inspecting a fuel controller with judgement of propriety based on inlet temperature of a turbine, judgment based an inlet flow detection value and judgment based on turbine revolving speed in the midway all added.

CONSTITUTION: When a starting command of a turbine is emitted, first a primary starting air valve 107 is opened and, after the elapse of a set time T1 of a timer, a starting air valve 106 is opened. Next, a detection value TIT of a turbine inlet temperature detector 116 is compared with the setting value YMAX, and when TIT>TMAX is the case, it is set down as normality, and the case other than that, it is set down as an inspection failure output element. When the said normality is the case, after the elapse of a set time T2,a detection value Wf of a fuelnozzle inlet flow detector 114 is compared with the setting value Wfm, and when Wf>Wfm is the case, it is set down as abnormality, that is, regarded as an inspection failure output element. And, in time of normality, after the elapse of a set time T3, if turbine revolving speed is more than the specified value, it is regarded as normality, but when it is less than the specified value, it is set down as the inspection failure output element.