飞行中，发动机是主要的气源。空气由发动机高压压气机第7级或第10级引出。
The aircraft engines are the primary source of compressed air in flight. The air is bled from the 7th or 10th stage of the engine High Pressure (HP) compressor.
因此，在核心机及基本发动机研制中，既要有燃气温度和转速的储备，又要有高压压气机性能的储备。
Therefore, the margin of the maximum gas temperature, rotor speed and capability of HP compressor are required during the development of core engine and baseline aero-engine.
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