当液压系统B的发动机驱动泵压力低于正常时，液压动力转换组件系统为前缘襟翼和缝翼提供备用液压。
AWhen hydraulic system B engine drive pump pressure is under normal conditions,the hydraulic power transfer unit system supplies standby hydraulic pressure to the leading edge flaps and slats.
BThe hydraulic power transfer unit system is provide spare hydraulic pressure to the leading edge flaps and slats when hydraulic system B engine-driven pump pressure is abnormal.
CThe hydraulic power transfer unit system supplies alternate hydraulic pressure to the leading edge flaps and slats when hydraulic system B engine-driven pump pressure is below normal.