Many pilots disconnect the autopilot as high as 1000 feet above touchdown if the weather is good and the runway is in sight. This so they can keep their hand flying skills sharpened.
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In cases of significant turbulence, a pilot may disengage the autopilot to help ease the vertical loads on the airplane by reducing the corrective control inputs. All takeoffs and most landing are done manually.
During inclement weather, the autopilot is normally used. In cases of significant turbulence, a pilot may disengage the autopilot to help ease the vertical loads on the airplane by reducing the corrective control inputs. All takeoffs and most landing are done manually.
A takeoff may be rejected for a variety of reasons, including engine failure, activation of the takeoff warning horn, direction from air traffic control (ATC), blown tires, or system warnings.
So it boils down to when the autopilot MUST be disengaged. Most of us disengage it at around 1,000 feet on approach, and won't engage it until around 10,000 in the climb. If it's a visual approach with a hard turn to final we'll disengage earlier because the autopilot can't make hard turns.
Most transport category aircraft and many others are equipped with a radar altimeter and other avionics required to make a 'Category III' approach. Most of them are able to fly an instrument approach and land themselves while the flight crew monitors the approach. Autopilots aren't used for takeoff.
If turbulence is unavoidable then FCOM procedures and recommended techniques must be applied to limit risks of injury to passengers or cabin crew and damage to the cabin: Keep autopilot ON.
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).
Answer: Usually the autopilot is engaged soon after takeoff and remains engaged until just before landing. I would estimate that over 90% of most flights are flown with the autopilot engaged.
They discovered that the average person spends about 47% of their day on “autopilot,” following automated behaviors while their thoughts wander from the task at hand.
On average in those incidents, NHTSA said: “Autopilot aborted vehicle control less than one second prior to the first impact.” Regulators also released data on crashes reported by automated-driving systems, which are commonly called self-driving cars.