A method of controlling a gas turbine engine , the gas turbine engine having in axial flow series a compressor , a combustor , a compressor-turbine and an exhaust , the compressor comprises variable guide vanes , the gas turbine capable of operating in at least - a high output power range , - a medium-high output power range , - a medium output power range , - a medium-low output power range and - a low output power range , the method comprising the steps - during the medium-high output power range varying the angle of the variable guide vanes so that a third predetermined temperature (T3) of the combustor is maintained, - during the medium output power range the variable guide vanes are at their most closed position and bleeding a gas from a downstream part of the compressor to an upstream part of the compressor so that a first predetermined temperature (T1) of the combustor is maintained, - during the medium-low output power range the variable guide vanes are at their most closed position and bleeding a gas from a downstream part of the compressor to an upstream part of the compressor is a maximum and bleeding a gas from the downstream part of the compressor to the exhaust so that a second predetermined temperature (T2) of the combustor is maintained. the gas turbine engine having in axial flow series a compressor , a combustor , a compressor-turbine and an exhaust , the compressor comprises variable guide vanes , the gas turbine capable of operating in at least - a high output power range , - a medium-high output power range , - a medium output power range , - a medium-low output power range and - a low output power range , - a high output power range , - a medium-high output power range , - a medium output power range , - a medium-low output power range and - a low output power range , the method comprising the steps - during the medium-high output power range varying the angle of the variable guide vanes so that a third predetermined temperature (T3) of the combustor is maintained, - during the medium output power range the variable guide vanes are at their most closed position and bleeding a gas from a downstream part of the compressor to an upstream part of the compressor so that a first predetermined temperature (T1) of the combustor is maintained, - during the medium-low output power range the variable guide vanes are at their most closed position and bleeding a gas from a downstream part of the compressor to an upstream part of the compressor is a maximum and bleeding a gas from the downstream part of the compressor to the exhaust so that a second predetermined temperature (T2) of the combustor is maintained. - during the medium-high output power range varying the angle of the variable guide vanes so that a third predetermined temperature (T3) of the combustor is maintained, - during the medium output power range the variable guide vanes are at their most closed position and bleeding a gas from a downstream part of the compressor to an upstream part of the compressor so that a first predetermined temperature (T1) of the combustor is maintained, - during the medium-low output power range the variable guide vanes are at their most closed position and bleeding a gas from a downstream part of the compressor to an upstream part of the compressor is a maximum and bleeding a gas from the downstream part of the compressor to the exhaust so that a second predetermined temperature (T2) of the combustor is maintained. <EOS>