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An electrical power system for an aircraft includes an ac generator bus, an air conditioning system ("ACS") generator and a main engine generator. The ACS generator supplies primary ac power to the bus while the frequency of the ac power is within a frequency range. If the frequency of the ac power

An electrical power system for an aircraft includes an ac generator bus, an air conditioning system ("ACS") generator and a main engine generator. The ACS generator supplies primary ac power to the bus while the frequency of the ac power is within a frequency range. If the frequency of the ac power goes outside the frequency range, the main engine generator supplies backup ac power to the bus. The frequency of the ac power generated the ACS generator is maintained between upper and lower limits. Such ac power can be used directly by certain ac loads onboard the aircraft. Other ac loads onboard the aircraft are supplied with fixed frequency ac power by reduced-size inverters.

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[ We claim:] [1.] An electrical power system for an aircraft, the electrical power system comprising:an ac generator bus;an ACS generator operable to provide primary ac power at variable frequencies;first means for connecting an output of the ACS generator to the ac generator bus while the ac genera

[ We claim:] [1.] An electrical power system for an aircraft, the electrical power system comprising:an ac generator bus;an ACS generator operable to provide primary ac power at variable frequencies;first means for connecting an output of the ACS generator to the ac generator bus while the ac generator power is within a frequency range;a main engine generator operable to provide backup ac power at variable frequencies; andsecond means for connecting an output of the main engine generator to the ac generator bus to provide backup power for the ACS generator.