"BCA03"
External Forum User
pica550@hotmail.com
Posted on:
Apr 15, 2003, 6:46 PM
Post #1 of 1
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Re: What is ILS and how is it used?
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"Tom Orle" <orle@postoffice.worldnet.att.net> wrote in message
news:2oto9vsvnjfu0tgemve9tqo70qm4072k39@4ax.com...
> "Handsome" <martin@fspaints.com> wrote:
>
> >As far as I'm aware the "APR" button will only hold you on course for the
> >runway.
> >Speed and altitude you have to control yourself.
> >
> >
> >Martin
>
> Speed yes - altitude no, if the approach has a glideslope. But up to
> the intercept you can have the AP hold the altitude. Just like the
> heading - upon glideslope capture the altitude light will turn off.
>
> I usually turn on the approach about 30 nm out at anywhere from 4000
> to 6000 feet agl and a speed of less than 250knots (remember, in the
> US you need to be at 250 knots or less under 10,000 feet!!). The
> localizer usually captures the heading around 28 nm out and the
> glideslope a bit less than 20.
>
> -=tom=-
Couple of points that may be of interest Tom.
That 250 Kts below 10 000 feet ( FL100 ) is a Worldwide thing, not just in
the States, although it is broken on a regular basis. The classic case is a
heavy 747. IRL the Pilot will often request and expect to get cleared to
climb at 280 or so.
The Glidelsope usually goes out at an Angle of 3 degrees, ( not withstanding
local obstacles or mountains etc. ) This approximates to around 300 feet per
Nm. So if an airfield is 500 feet above Sea level, the Glideslope will be at
3500 feet when 10 Nm from the runway, or thereabouts. There is also
something referred to as the " ILS platform ". This is the height at which
you should be hitting the Glideslope, and is often between 2000 and 3000
feet.(QNH not QFE)
Aint nothing wrong with looking to capture it when still nigh on 20 Nm from
the runway of course.
HTH
Chris J
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