What is an alternate airport not authorized?

Airports with alternate minimums that are not authorized are denoted on the approach chart with the “ ” designation and are not listed in this section. NA - means alternate minimums are not authorized due to unmonitored facility, absence of weather reporting service, or lack of adequate navigation coverage.



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Not more than one hour from the departure airport at normal cruising speed in still air with one engine inoperative. (2) Aircraft having three or more engines. Not more than two hours from the departure airport at normal cruising speed in still air with one engine inoperative.

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This is the ol' 1-2-3 rule. There are a couple of gotchas. If your destination has no approach, an alternate is always required. Curiously, though, the alternate need not have an instrument approach if the weather allows a descent from MEA under basic VFR, assuming the airport isn't otherwise disqualified.

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ATC receives only your filed destination, not the alternate. This is why ATC has to ask where a pilot wants to divert. To give ATC a heads up on where you want to go, you can write it in the remarks section, which is transmitted to ATC.

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Conclusion. While air traffic controllers play a vital role in managing air traffic, they do not have direct access to an aircraft's airspeed. Instead, they rely on radar systems, flight plans, and communication with pilots to ensure safe and efficient aircraft separation.

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If the airport of departure and arrival, and the route flown, are all in uncontrolled airspace, no ATC contact is needed. Your location will determine whether or not you need to contact Air Traffic Control. If you are within an airport traffic area that has a control tower, you'll need to contact atc.

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Consequences. Taking off without ATC clearance may lead to: Runway Incursion - The aircraft may have been cleared only to the runway holding point. Also, at relatively complex aerodromes, taking off may mean crossing other runways.

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It is essential, therefore, that pilots acknowledge each radio communication with ATC by using the appropriate aircraft call sign. Brevity is important, and contacts should be kept as brief as possible, but controllers must know what you want to do before they can properly carry out their control duties.

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(a) The pilot in command of an aircraft is directly responsible for, and is the final authority as to, the operation of that aircraft. (b) In an in-flight emergency requiring immediate action, the pilot in command may deviate from any rule of this part to the extent required to meet that emergency.

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As long as both parties coordinate and agree, the aircraft can land based on the ATC's chosen direction or the pilot's chosen direction. ATC will usually make sure approaching aircraft are kept aware of the wind conditions so that agreement can be made. Either party can decline/deny the approach and/or landing.

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When communicating between a ground-based station like Air Traffic Control and an aircraft, the distance is somewhere in the middle. So, with an aircraft at 36,000 feet and the ATC radio tower at 100 feet, communication will be possible up to 250 nautical miles away.

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