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A starter/generator electrical system for gas turbine powered aircraft with mixed power architecture to combine advantages of each. The mixed power architecture may be selected from constant frequency (CF), adjustable variable frequency (AVF) and narrow range variable frequency (NRVF) alternating cu

A starter/generator electrical system for gas turbine powered aircraft with mixed power architecture to combine advantages of each. The mixed power architecture may be selected from constant frequency (CF), adjustable variable frequency (AVF) and narrow range variable frequency (NRVF) alternating current (AC) systems to suit aircraft requirements for on-board electric components and redundancy, with at least two separate power generation systems provided for each gas turbine engine on the aircraft.

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What is claimed is: 1. A starting and generating system for gas turbine engine powered aircraft comprising: a first electrical power generation system that provides adjustable variable frequency (AVF) alternating current (AC) coupled to each engine comprising a dynamoelectric machine for starting t

What is claimed is: 1. A starting and generating system for gas turbine engine powered aircraft comprising: a first electrical power generation system that provides adjustable variable frequency (AVF) alternating current (AC) coupled to each engine comprising a dynamoelectric machine for starting the engine and generating electrical power for a first group of on-board electrical components that require AVF AC power; a first electrical power bus coupled to each first electrical power generation system for distributing power from its respective first electrical power generation system to the first group of on-board electrical components; and a second electrical power generation system coupled to each engine for generating narrow range variable frequency (NRVF) AC electrical power for a second group of on-board electrical components that require NRVF AC power. 2. The system of claim 1, wherein each second power generation system comprises another AVF AC power generation system. 3. The system of claim 2, wherein the second group of on-board electrical components comprise electrical components that require AVF power generation system. 4. The system of claim 1, further comprising an auxiliary power unit (APU) with a first power generation system for supplying AVF AC power for starting each engine with the dynamoelectric machine of its coupled first power generation system and powering the first group of on-board electrical components through the first electrical power bus; and a second power generation system for supplying power to the second group of on-board electrical components through each second electrical power bus; wherein the second power generation system comprises a NRVF AC power generation system and the second group of on-board electrical components require NRVF AC power. 5. A starting and generating system for gas turbine engine powered aircraft comprising: a first electrical power generation system coupled to each engine that provides adjustable variable frequency (AVF) alternating current (AC) comprising a dynamoelectric machine for starting the engine and generating electrical power for a first group of on-board electrical components that require AVF AC power; a first electrical power bus coupled to each first electrical power generation system for distributing power from its respective first electrical power generation system to the first group of on-board electrical components; a second electrical power generation system coupled to each engine for generating narrow range variable frequency (NRVF) AC electrical power for a second group of on-board electrical components that require NRVF AC power. 6. The system of claim 5, further comprising an auxiliary power unit (APU) with a first power generation system for supplying AVF AC power for starting each engine with the dynamoelectric machine of its coupled first power generation system and powering the first group of on-board electrical components through the first electrical power bus. 7. The system of claim 6, wherein the APU further comprises a second power generation system for supplying NRVF AC power to the second group of on-board electrical components through each second electrical power bus.