How do planes know when to take off?

All aircrafts have to reach a Rotation speed or Vr speed, after which the aircraft can safely takeoff. This speed is calculated before every takeoff.



The decision for a plane to take off is a highly coordinated process between the flight crew and Air Traffic Control (ATC). It begins with the pilot receiving "Clearance Delivery," followed by "Ground Control" providing instructions to taxi to the runway. Once the aircraft reaches the "hold short" line of the runway, the pilot switches to the Tower Frequency. The Tower Controller, who has a visual of the runway and radar data of all nearby traffic, provides the formal "Cleared for Takeoff" instruction. In 2026, this process is increasingly supported by Surface Awareness Initiative (SAI) technology, which provides controllers with real-time GPS positions of all vehicles on the airfield to prevent "runway incursions." While the controller gives the legal clearance, the Final Authority always rests with the Pilot-in-Command (PIC). If the pilot observes a safety hazard, such as a bird flock or a mechanical warning, they can decline the clearance and remain on the ground.

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Turbulence is a sudden and sometimes violent shift in airflow. Those irregular motions in the atmosphere create air currents that can cause passengers on an airplane to experience annoying bumps during a flight, or it can be severe enough to throw an airplane out of control. (The pilots) aren't scared at all.

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Whether flying at night or during the day, pilots need to see some kind of horizon. They use this to determine the airplane's attitude. At night pilots will turn their gaze from outside to inside and use the artificial horizon. The artificial horizon is normally a simply globe split into two hemispheres.

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In the event of an engine malfunction, the recognition of a significant abnormality, or an ATC instruction to stop the aircraft during the take off roll, transport aircraft in Performance Category 'A' should be able to safely reject the take off if the decision to do so is made at a speed not greater than the correctly ...

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For light aircraft, usually full power is used during takeoff. Large transport category (airliner) aircraft may use a reduced power for takeoff, where less than full power is applied in order to prolong engine life, reduce maintenance costs and reduce noise emissions.

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On average, commercial planes cruise at about 575-600 mph (925-965 km/h, 500 to 521 knots, 0.78 to 0.81 Mach). Private jets typically cruise at around 500-600 mph (805-965 km/h, 435 to 521 knots, 0.68 to 0.81 Mach). Military aircraft can exceed 1,500 mph (2,400 km/h, 1,297 knots, 2.08 Mach).

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Reasons to perform a rejected takeoff vary, but are usually related to a suspected or actual problem with the aircraft, such as an engine failure; fire; incorrect configuration; aircraft control issue; unusually slow acceleration; automated warning signal(s) indicating a critical system failure; environmental ...

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What happens if you need to get on the ground right away? In almost every case, any commercial plane flying is technically able to land even at close to its maximum takeoff weight.

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On many aircraft types, pilots can open the side windows in the cockpit. The main reason for this is not for ventilation or vision; it is related to aircraft safety law.

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Use of visual entertainment such as movies, television programs, video games, etc., is not allowed for a flight crew as they are required to maintain visual scanning outside the aircraft, if able, for situational awareness and collision avoidance.

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When an aircraft experiences turbulence, the plane can drop or change altitude suddenly. This is why pilots always caution passengers to buckle up and stay seated when they are experiencing flight turbulence. The sudden movements put passengers at risk.

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Sure, it happens all the time to incautious pilots. 1966, a Boeing 707 was brought down by turbulence (BBC ON THIS DAY | 5 | 1966: Passenger jet crashes into Mount Fuji ) when the pilot had diverted from his planned flight path out of Tokyo to show his passengers Mount Fuji.

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While turbulence can feel scary, airplanes are designed to withstand massive amounts of it. A plane cannot be flipped upside-down, thrown into a tailspin, or otherwise flung from the sky by even the mightiest gust or air pocket, wrote pilot Patrick Smith on his site, AskThePilot.com.

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Whether flying at night or during the day, pilots need to see some kind of horizon. They use this to determine the airplane's attitude. At night pilots will turn their gaze from outside to inside and use the artificial horizon. The artificial horizon is normally a simply globe split into two hemispheres.

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All pilots have to do is follow the beams down to 200 feet above the ground, at which point they must be able to see the runway and its approach lights. If not, by federal law, they must climb back up into the soup and decide whether they want to try another approach or go to an alternate airport.

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Accident statistics suggest that flying by night accounts for about 10% of the general aviation accidents, but 30% of the fatalities. That suggests night flying must be inherently more dangerous than aviating when the sun is up.

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Yes many have run off the ends of runways. sometimes to major damage and injury to pots and passengers some times there is no damage and after inspection the aircraft goes back k into service.

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It's for your own safety. If anything happens during take-off and landing - the most risky stages of every flight - then your eyes will already be used to the dark or the light outside, and you'll be able to react more quickly. That's also the reason why the lights in the cabin are dimmed for take-off and landing.

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Slowest aircraft The Ruppert Archaeopteryx has a certified stall speed of 30–39 kilometres per hour (19–24 mph). The Vought XF5U can fly as slow as 32 kilometres per hour (20 mph).

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The higher you fly, the more efficient it is The reason planes cruise at high altitudes is that they burn less fuel and can fly faster, as the air is less dense. At 30,000 feet and higher, it is also possible for aircraft to avoid weather systems, making it more comfortable onboard.

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