Hi,
Firstly to say that this is one of my favourite ever website finds! Top notch stuff and my two yound boys are thrilled with this site. Well done!
I live about 20km SW of Schiphol airport, Amsterdam and I have noticed that many of the aircraft report that they are up to -25m altitude when they have landed. Now I admit, Schiphol is a very low altitude airport at 3 metres below sea level. There is also a lot of variation, from around +40m down to -25m. I thought that this might be related to the local air pressure, but then I have also noticed that some planes land perfectly on the runway and other appear to land several 10s of metres to either side.
What causes these innacuracies? Surely the aircraft instruments are pretty damn accurate, otherwise we'd have a lot more crashes on our hands. Where exactly does the transponder get it's data from? I assume that it must transmit the same data that the flight crew see in the cockpit.
On a separate note, I assume that the strangely quiet skies over France and Spain tonight are due to volcanic ash once more. Really weird to see!
Firstly to say that this is one of my favourite ever website finds! Top notch stuff and my two yound boys are thrilled with this site. Well done!
I live about 20km SW of Schiphol airport, Amsterdam and I have noticed that many of the aircraft report that they are up to -25m altitude when they have landed. Now I admit, Schiphol is a very low altitude airport at 3 metres below sea level. There is also a lot of variation, from around +40m down to -25m. I thought that this might be related to the local air pressure, but then I have also noticed that some planes land perfectly on the runway and other appear to land several 10s of metres to either side.
What causes these innacuracies? Surely the aircraft instruments are pretty damn accurate, otherwise we'd have a lot more crashes on our hands. Where exactly does the transponder get it's data from? I assume that it must transmit the same data that the flight crew see in the cockpit.
On a separate note, I assume that the strangely quiet skies over France and Spain tonight are due to volcanic ash once more. Really weird to see!
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