![]() If this is to be a Category III Instrument Landing System (ILS) approach with Autoland, the autopilot controls the aircraft flight path so that it follows the ILS glide path and localiser, adjusting the power to maintain the appropriate speed and commencing the flare as required to achieve a safe landing without the runway being visible until the final stage of the approach. On commencing the descent, the power is adjusted and the aircraft descends at the appropriate speed and on the required routing, leveling as required in accordance with the flight clearance until the approach is commenced. If an autothrottle is not installed, the pilot must make all power adjustments appropriate to the autopilot mode and phase of flight. ![]() At the same time, the aircraft follows the flight plan route. The aircraft then levels at the required altitude or flight level while the power is adjusted to achieve and maintain the programmed speed. If an autothrottle/autothrust system is installed, the appropriate thrust may be automatically set during take-off, and is then adjusted automatically as the climb progresses, while the aircraft climbs at the appropriate speed for its mass and ambient conditions. Modern autopilots are normally integrated with the flight management system (FMS) and, when fitted, the autothrottle system.Īutopilot software, which is integrated with the navigation systems, is capable of providing control of the aircraft throughout each phase of flight. Early autopilots were only able to maintain a constant heading and altitude, but modern autopilots are capable of controlling every part of the flight envelope from just after take-off to landing. An autopilot is a device used to guide an aircraft without direct assistance from the pilot.
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