What happens if autopilot fails?

In any case, if the autopilot actually fails, you are no longer RVSM compliant and are required to notify ATC of the failure, and you will likely be told to descend below RVSM airspace, to finish your trip (which can impose a significant fuel burn penalty on a turbofan or turbojet).



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You need a working autopilot to fly above 29000 ft in RVSM airspace (where crossing traffic is only 1000ft above or below), but you don't necessarily have to have it engaged, and ATC doesn't know whether you have it engaged or not.

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As for actually using the autopilot, more often than not most pilots use it after a few thousand feet at most. Hand flying to altitude is very rare and only a few guys even regularly fly it up to 10k. Pilots new to airliners tend to turn on the autopilot early and keep it on until about 1000' before landing.

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All large commercial jets can land automatically, but still with plenty of pilot involvement. So-called autoland systems are a part of aircraft autopilots. All large modern jets are equipped with such systems, which can automatically land the aircraft, albeit under careful supervision from the pilots themselves.

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Moreover, there's one autopilot accident every 4.8 million miles driven, as per Tesla. However, until Tesla releases the data it possesses, it would be impossible to verify its claims. For now, the NHTSA data signals that the vast majority of 807 autopilot-related accidents since 2021 involved Tesla cars.

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On any given flight, the autopilot is engaged for around 98% of the time that the aircraft is airborne. However, the systems in modern aircraft have come a long way from simply keeping the wings level and the nose on the horizon.

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