Patent ID: 8800918

Claim:
A method for generating accessory power from a gas turbine engine comprising the steps of: providing a gas turbine engine having a high pressure compressor and a rotor shaft connected to said engine; using power from said rotor shaft to generate power for driving at least one accessory; monitoring at least one parameter which provides information about an incipient change in power demand; bleeding air from said engine during a transient state in response to said at least one monitored parameter; reducing demand for mechanical shaft power from said rotor shaft so as to reduce an operating line of said compressor and thereby improving a stall margin of said engine; and said demand reducing step comprising supplying said bleed air to a pneumatically operated means for generating power to operate said at least one accessory, wherein said monitoring step comprises inputting a signal representative of a torque change on a drive shaft indicating a power demand change to a full authority digital engine control device.