turbine engine power extraction and acceleration capabilities are enhanced by the sensing of the amount of air that is bled off from a compressor , and biasing the acceleration schedule in relation thereto . in this way the engine shaft power extraction and / or rotor acceleration capability can be maximized by enriching the acceleration fuel schedule when compressor bleed air is extracted . the selected degree of enrichment may be applied so as to consume the entire stall margin gain , whereby the engine is made to follow the same acceleration trajectory on a compressor map notwithstanding the degree of compressor bleed , or the degree of enrichment may be applied so as to obtain the desired performance level while retaining a portion of the gained stall margin .