Why do pilots say flight level?

Flight levels are used to ensure safe vertical separation between aircraft, despite natural local variations in atmospheric air pressure. Historically, altitude has been measured using a pressure altimeter, which is essentially a calibrated barometer.



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The maximum height that a commercial airplane is allowed to reach when they fly is 42,000 feet, as this is the universally approved maximum altitude. This max altitude for airplanes is known as the “service ceiling.” Most commercial air jets fly at such a high altitude because it is known to optimize efficiency.

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Flight levels are then assigned a number which is the apparent altitude (pressure altitude) to the nearest thousand feet, divided by one hundred. Therefore an apparent altitude of 18,000 feet is referred to as Flight Level 180.

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The minimum safe altitude of a route is 19,000 feet MSL and the altimeter setting is reported between 29.92 and 29.43 “Hg, the lowest usable flight level will be 195, which is the flight level equivalent of 19,500 feet MSL (minimum altitude (TBL ENR 1.7-1) plus 500 feet).

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SQUAWK: A Basic Definition In short, SQUAWK refers to the communication that comes from an aircraft's transponder — or the radio equipment that a plane has that allows it to communicate with the radar system of air traffic control on the ground.

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: to utter a harsh abrupt scream. 2. : to complain or protest loudly or vehemently. opponents of the bill squawked.

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Aircraft are much more efficient when flying at higher altitudes. Have you ever wondered why passenger airplanes always cruise at altitudes of 30,000 and higher above mean sea level? The reason is twofold: firstly, the plane can fly faster and, secondly, it is much more efficient money-wise.

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Fly below 120m (400ft) Flying below the legal height limit of 120m (400ft) will reduce the risk of coming across other aircraft, which normally fly higher than this.

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The United Kingdom Low Flying System (UKLFS) is the airspace across the United Kingdom in which low flying training is permitted. The system was established in 1979 and extends from ground level to 2000ft AGL. Flying is carried out from 0800 to 2300 during weekdays only.

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Why Mount Everest is a no-fly zone - The Hindu BusinessLine.

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A private jet can fly at a height of up to 45 000 ft, though most cruise at 41 000 ft. This is generally higher than an airline flight and allows for a more direct route – out of the most congested area of the sky. A private jet pilot will choose the optimum cruising altitude depending on the distance of the journey.

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Specifically, the cruising speed of commercial airliners is typically around 550-600 mph, or Mach 0.85. Takeoff and landing speeds are much slower, typically between 130-180 mph, depending on the aircraft and weather conditions.

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