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ATC Tutorial

3 bytes added, 19:38, 12 July 2014
Getting the departure clearance: Minor spelling fixes
We start on the airport apron at terminal T1, stand 220.
The first thing we need to do is to check the current air pressure and which runway is being used; as a general rule, planes should be heading into the wind for takeoff and landing. To accomplish this, we need to listen to the ''ATIS'' (Automatic Terminal Information Service), a prerecorded message describing weather information, the runways in use and other important information for pilots and ; it's transmitted continuously on a dedicated radio channel. The frequency to use is written in the Airport information chart and can also be found by clicking on ''AI -> ATC Services in Range -> LEBL'': in our case, it's 121.970 MHz.
We open the Radio panel, set the COM1 frequency to 121.97 and listen to the ATIS message:
# We're going to depart from runway 25L.
# We need to set the altimeter to 1018 hPa<ref>European airports generally use hPa (hectopascals) for the QNH while American ones use inHg (inches of mercury). Some airplanes allow you to enter QNH values using both units; if that is not the case, you will need to use a converter.</ref> and set it back to standard pressure (STD) at the transition level (FL050, or 5000 feet).
# Every ATIS broadcast is identified by a progressive letter of the [http://en.wikipedia.org/wiki/NATO_phonetic_alphabet NATO phonetic alphabet]; we'll need to tell the delivery controller that we have information "Alpha" so that (s)he can checkwhether check whether we have the latest information or not.
Note also that numbers are spelled out for clarity - this will be done in all further communication.

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