燃油箱中的燃油通过燃油活门被送到燃油控制组件。燃油控制组件对进入燃烧室的燃油进行调节。调节燃油量可对 APU发动机起动时的加速进行控制。当一个负载被加到 APU上时，燃油控制组件测量燃油量以保持一个相近的恒定速度及组件的安全温度。

(5) The APU ignition and starting system provides the means of rotating the APU engine to starting speed and for igniting the fuel-air mixture in the combustion chamber. This system consists of a start switch, starter, start relay, ignition exciter, igniter plug, and control circuit. The starter provides initial power for rotatin the APU engine compressor, tubine, and engine –driven accessories to a speed high enough to obtain good airflow for combustion. The ignition exciter provides the high voltage required to produce the spark at the ignitor plug, the ignition exciter electrical components are enclosed in a hermetically sealed metal container. The igniter plug is installed on the forward side of the combustion chamber, it

is used to provide the high energy spark for igniting the fuel/air mixture. APU点火及起动系统提供 APU发动机起动速度时的转动及点燃燃烧室中的油气混合物。这系统包括一个起动开关、起动器、起动继电器、点火励磁器、点火器插头及控制电路。起动器为 APU发动机压气机、涡轮及发动机驱动附件到足够高的速度以得到燃烧所需的气流转动提供初始动力。点火励磁器为在点火器插头上产生火花提供高压电能，点火励磁器电子组件被封入一个密封地金属容器内。点火插头被安装在燃烧室的前面，被用来提供点燃油气混合物的高能花火。