On Tuesday, 19 December 2017 16:59:47 UTC, Rod Speed wrote:
"whisky-dave" wrote in message
...
On Monday, 18 December 2017 16:58:36 UTC, Rod Speed wrote:
whisky-dave wrote
Rod Speed wrote
whisky-dave wrote
Vir Campestris wrote
whisky-dave wrote

The economical cruise altitude rises as the plane gets lighter,
so they want to climb gently all the way across the ocean.

But they don't do that.

True, but thats for other reasons.

Yes because they donl;t like losing radar contact with planes,

Thats a lie with the long haul flights
over the ocean. There is no alternative.

they are in the minority presently.

Irrelevant.

Very relavant.

And when the system handles those fine,

whe it does, I donlt think the seefax technology of teh 70s will be kept for much longer.

no point in having full radar coverage over the long
haul routes over land when its nowhere near any
major airports.

True but the problem is it can't be done cheaply.


Didnlt find Malaysia Airlines Flight 370 did it.

Because they chose to turn theirs off to save on the cost.

So how comes they couldn't use radar to find where the plane was ?

Because its not possible to have full radar coverage over oceans
as big as that.

Well done at last, only about 10% of the world is covered by radar so that's a lot of space not covered by radar and a lot of space where planes could be.


And planes arent forced to fly where there is full radar
coverage either, most obviously between the RSA and Australia. The
alternative works fine and has done for well over half a century now.
In spades with the Pacific and southern Atlantic.

No it doesn't capacity is being lost and planes are taking longer routes because of it.




It will be replaced as ACARS isn;t in real time

Thats is a bare faced pig ignorant lie.

No it isn't.

http://www.bbc.co.uk/news/world-asia-pacific-26544554


While GPS (Global Positioning System) is a staple of modern life, the world's air traffic control network is still almost entirely radar-based.

Aircraft use GPS to show pilots their position on a map, but this data is not usually shared with air traffic control.

Some of the most modern aircraft are able to "uplink" GPS data to satellite tracking services, but handling large volumes of flight data is expensive and such systems are usually only used in remote areas with no radar coverage.

The satellite data which suggests flight MH370 flew on for several hours are basic 'pings' sent by the plane, and so far only help to identify two very approximate flight corridors north and south.

Over the next decade, a new system called ADS-B (Automatic Dependent Surveillance Broadcast) is expected to replace radar as the primary surveillance method for air traffic control

ADS-B will see aircraft work out their position using GPS and then relay data to the ground and other planes.


and can be turned off.

So can transponders.

Yes they can, but not by accident or error.