燃油箱中的燃油通過燃油活門被送到燃油控制組件。燃油控制組件對進入燃燒室的燃油進行調節(jié)。調節(jié)燃油量可對 APU發(fā)動機起動時的加速進行控制。當一個負載被加到 APU上時，燃油控制組件測量燃油量以保持一個相近的恒定速度及組件的安全溫度。

(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點火及起動系統(tǒng)提供 APU發(fā)動機起動速度時的轉動及點燃燃燒室中的油氣混合物。這系統(tǒng)包括一個起動開關、起動器、起動繼電器、點火勵磁器、點火器插頭及控制電路。起動器為 APU發(fā)動機壓氣機、渦輪及發(fā)動機驅動附件到足夠高的速度以得到燃燒所需的氣流轉動提供初始動力。點火勵磁器為在點火器插頭上產生火花提供高壓電能，點火勵磁器電子組件被封入一個密封地金屬容器內。點火插頭被安裝在燃燒室的前面，被用來提供點燃油氣混合物的高能花火。