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ATC tutorial: Difference between revisions
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Adjust wind heading under lesson 3. Erroneously described Wind reading as direction wind is going to. Fixed to say it describes where winds are coming from.
m (typo) |
Fusionstream (talk | contribs) (Adjust wind heading under lesson 3. Erroneously described Wind reading as direction wind is going to. Fixed to say it describes where winds are coming from.) |
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''ground control (_GND) and the tower (_TWR).'' | ''ground control (_GND) and the tower (_TWR).'' | ||
First, we have to know which runway is being used so that ground can get the plane to the right place. The rule is 'planes always like to be heading into the wind for takeoff or landing'. The winds are given in the METAR like 'xxxyy'. The | First, we have to know which runway is being used so that ground can get the plane to the right place. The rule is 'planes always like to be heading into the wind for takeoff or landing'. The winds are given in the METAR like 'xxxyy'. The wind heading is given first in 3 digits, and the speed after that in 2 digits; so 11007 indicates winds of 7kts that are coming from 110 degrees (magnetic heading). Winds under 5 kts can be considered 'calm' and can be ignored. Thus, the basic idea is to match the heading of the wind, and the runway heading (add a '0' to the runway number - 17L is 170) as closely as possible. Runways are numbered by knocking the '0' off the heading, and appending 'L' for left or 'R' for right if there are parallel runways. | ||
At Heathrow, there are runways 9L and 9R, and the same runways (used in opposite directions) 27R and 27L. If the wind is 110º @ 15 kts then runways 9L and 9R are most suitable, as 90 and 110 are only 20 degrees away, but 270 and 110 are 160º away! At Heathrow, where there are parallel runways, one runway can be used for landing and the other for taking off - so a plane can be leaving on 9L while another is almost landing on 9R. Where there is only one runway, the same runway can be used to landing and taking off. It is important to notice that if an aircraft is taking off on runway 7, and another lands shortly after on runway 7, they are travelling in the same direction, so they are not approaching each other, and a collision is impossible. | At Heathrow, there are runways 9L and 9R, and the same runways (used in opposite directions) 27R and 27L. If the wind is 110º @ 15 kts then runways 9L and 9R are most suitable, as 90 and 110 are only 20 degrees away, but 270 and 110 are 160º away! At Heathrow, where there are parallel runways, one runway can be used for landing and the other for taking off - so a plane can be leaving on 9L while another is almost landing on 9R. Where there is only one runway, the same runway can be used to landing and taking off. It is important to notice that if an aircraft is taking off on runway 7, and another lands shortly after on runway 7, they are travelling in the same direction, so they are not approaching each other, and a collision is impossible. | ||