Abstract: A method for integrating airplane operation related services provided by ground-based systems is described. The method includes receiving information from a plurality of airplane service functions, the airplane service functions including airlines, airplanes, regulatory authorities, maintenance repair organizations, and aircraft manufacturers, the received information relating to airplane operation. The method further includes determining which of the received airplane operation information is applicable to each of the airplane service functions, and distributing the applicable airplane operation information to each of the airplane service functions.

Abstract: A method for integrating airplane operation related services provided by ground-based systems is described. The method includes receiving information from a plurality of airplane service functions, the airplane service functions including airlines, airplanes, regulatory authorities, maintenance repair organizations, and aircraft manufacturers, the received information relating to airplane operation. The method further includes determining which of the received airplane operation information is applicable to each of the airplane service functions, and distributing the applicable airplane operation information to each of the airplane service functions.

Abstract: A feed-forward amplification circuit, for producing compensated output signals, comprises an amplifier arranged to receive a plurality of input signals including a control signal, within a predetermined frequency range, and to produce a plurality of amplified signals including said control signal, within said predetermined frequency range, wherein said predetermined frequency range lies within the operational range of the amplifier. Phase shift means are arranged to receive said input signals and said amplified signals and to introduce a relative phase shift between said input signals and said amplified signals to produce an error signal. Combination means for combining said error signal with said amplified signals to produce said compensated output signal; and control means for controlling said phase shift means in dependence on the relative phase difference between the control signal in said input signals and the control signal in said amplified signals.

Abstract: A feed-forward amplification circuit, for producing compensated output signals, comprises an amplifier arranged to receive a plurality of input signals including a control signal, within a predetermined frequency range, and to produce a plurality of amplified signals including said control signal, within said predetermined frequency range, wherein said predetermined frequency range lies within the operational range of the amplifier. Phase shift means are arranged to receive said input signals and said amplified signals and to introduce a relative phase shift between said input signals and said amplified signals to produce an error signal. Combination means for combining said error signal with said amplified signals to produce said compensated output signal; and control means for controlling said phase shift means in dependence on the relative phase difference between the control signal in said input signals and the control signal in said amplified signals.