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Landing Separations ... Really?

Thu Oct 06, 2011 6:21 am

I heard this on the radio last night ... and had to query the accuracy of either the person being quoted or the reporting. Now that I've found a second source, I'm wondering if the person being quoted is really in the right position.

From The China Post of 6 Oct 2011:

With the new system, the distance between landing flights could be reduced from 30-50 nautical miles to less than 15 nautical miles, according to the Civil Aeronautics Administration (CAA).

The article is talking about a new ATC system that has been introduced at TPE. Quick pillow calculations last night, based on very rough numbers and based on my observed landing speeds of various L/H aircraft (thanks to the IFE system) told me that these separations would give roughly two to four movements per hour per runway.

I recall that the recommended separation for the A380 is 5 or 6 nm.

Have I missed something?

Link to article:
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RE: Landing Separations ... Really?

Thu Oct 06, 2011 6:34 am

  I'm slightly confused as well. Maybe we're both just missing the point lol

Quoting Brenintw (Thread starter):
I recall that the recommended separation for the A380 is 5 or 6 nm.

If my memory serves me correctly, separation for an A380 is anywhere from 4 NM for a following super, to 10 NM for a light a/c.

Edit: Double-checked my facts, it is 10NM, not 8.

[Edited 2011-10-05 23:40:12]
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RE: Landing Separations ... Really?

Thu Oct 06, 2011 8:45 am

Well take LHR for example, where the aircraft call the tower on an 8 mile final. At any one time you can have 3-4 aircraft within that 8 miles, so I would think the clearance is lot lower than 15-20 miles.
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RE: Landing Separations ... Really?

Fri Oct 07, 2011 5:13 pm

The words "distance between landing flights" in the article is a bit confusing. They probably didn't mean the separation on final, but rather the separation in use by the controllers thoughout the control center, probably over the ocean, where radar converage is not appropriate (roughly 200nm and more off the coast of Taiwan).

That being said, i dont know if Taipei FIR's airspace extends that far out over the ocean.


[Edited 2011-10-07 10:17:40]
us Air Traffic Controllers have a good record, we haven't left one up there yet !!

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