Why do pilots ask for altimeter?

“What is the purpose of the altimeter reading given to pilots by ATC?” That is the local barometric reading, so the pilots can adjust their altimeter to the same reading to show the correct and accurate altitude for the area at that time. That's very important for landing.



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Can you take off without a functioning altimeter? No. As answered elsewhere, FAR part 91 defines the minimum equipment required for flight (airspeed, altitude, compass, power). it is currently a legal requirement to have an altimeter in your airplane.

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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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Answer: The flight operator files a requested altitude, usually done by the flight dispatcher, based on performance and economics. Air traffic control reviews the flight plan, checking for conflicts. They issue the cruising altitude based on the requested flight plan and other traffic.

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A Flight Level (FL) is the vertical distance of an aircraft above the ISOBARIC SURFACE of 1013.25hPa (hecto Pascal) or 29.92 in Hg (inches of Mercury).

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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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