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Civil Aviation Flight University of China Auto Throttle 自动油门 Auto Throttle (A/T) Civil Aviation Flight University of China A typical A/T system provides automatic thrust control from the start of take-off through climb, cruise descent, approach and go-around or landing. The A/T system also ensures that the engines operate within the permitted engine limits. The A/T system has a number of operating modes that can be used from brakes release through to landing. Auto Throttle (A/T) Civil Aviation Flight University of China A/T Mode Control Panel Figure 3.15 Civil Aviation Flight University of China A/T Mode Control Panel A/T ARM switch arms autothrottle for engagement. Autothrottle engages when EPR or SPD switch is pushed, and when V NAV, FL CH or GA modes are active. EPR switch engages autothrottle to hold reference EPR displayed on EICAS, subject to maximum speed limits. SPD switch engages autothrottle to hold speed or Mach indicated in IAS/MACH indicator. It cannot be engaged while in the TO thrust mode. Civil Aviation Flight University of China A/T Mode Control Panel Figure 3.15 A/T DISC light indicates autothrottle is disengaged, either due to malfunction, pushing autothrottle disengage switch, or raising reverse levers to the interlock. Autothrottle disengage switches disengage the autothrottle. Second push turns off A/T DISC light. Civil Aviation Flight University of China Figure 3.16 Thrust Mode Control Panel Required EPR (or N1) for the A/T EPR mode would be selected on a separate thrust mode control panel . The available thrust modes are: ? take-off/go-around (TO/GA) — full power; ? climb power (CLB), plus two values of derated climb power; ? maximum continuous power (CON); and ? cruise power (CRZ). Thrust Mode Control Panel Civil Aviation Flight University of China Thrust mode select switches select the thrust mode to be use