flyboyseven
Topic Author
Posts: 803
Joined: Sun Feb 04, 2007 12:24 pm

### Terminal/Runway Seperation

How close could you put the end of a runway to a terminal so that the final is over the terminal? Is 3000' with another 2500' displaced threshold good?

Or, what is the minimum altitude for going over a terminal on final? Is 900' enough?

I really have no idea.

Thanks
Graham
As long as the number of take-offs equals the number of landings...you're doing fine.

vikkyvik
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Joined: Thu Jul 31, 2003 1:58 pm

### RE: Terminal/Runway Seperation

 Quoting Flyboyseven (Thread starter):How close could you put the end of a runway to a terminal so that the final is over the terminal? Is 3000' with another 2500' displaced threshold good? Or, what is the minimum altitude for going over a terminal on final? Is 900' enough?

I suppose that it would depend, among other things, on the max height above the runway of the terminal (or the max vertical stab height of airplanes parked at the terminal).

Believe the FAA mandates a 1000' x 500' minimum clear area at runway ends. Then there's all the confusion of displaced thresholds, stopways, clearways, blast pads, etc. I've never quite been able to get my head around all of it.

But to give you a general idea, assuming a standard 3 degree glideslope and a 50 foot threshold clearance height, an airplane will be descending at about 50 feet vertical per 1000 feet horizontal (a 5% gradient).

So, at 1000 feet from threshold, an airplane would be at about 100 feet. At 2000 feet from threshold, it'd be at 150 feet. At a half nm from threshold, it'd be at just over 200 feet.

Obviously, obstacle clearance gradients will be more restrictive than a standard 3 degree gildeslope.
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AAH732UAL
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Joined: Sun Mar 30, 2008 9:41 pm

### RE: Terminal/Runway Seperation

27R at DTW is very close to Mac as well as Smith. I think that is why they only use it for taxi now, b/c it is too close to MacNamera.
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