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Forgive me if this has been asked before (Read 1163 times)
Aug 9th, 2012 at 5:17am

bifo   Offline
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I land airbus's (A321 wilcopub) regularly first time at Dusseldorf but my CRJ 700(wilopub) gives me grief. I have a suspicion my Glide Slope height is questionable EDDL is about 145 feet above Sea Level do I add this to my FL290 (2900ft). When I try a second time it's ok because I make sure of a long straight final approach. Obviosly ILS I am talking. Perhaps a final of 15NM straight is required. CRS 053 Freq 111.50 and final height of 2900ft RNWY 05R. Any indications and help would save me tearing my hair out  Smiley
 
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Reply #1 - Aug 9th, 2012 at 3:08pm

DaveSims   Offline
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Dusseldorf is indeed about 147 feet above sea level.  However I am not sure where you are getting your altitude of 2900 ft (by the way, it is not flight level FL290, which would be 29,000 feet).  Are you referring to the height which you intercept the glideslope?  In that case you would not add the 147 feet, although it wouldn't make much of a difference if you had.  At 2900 feet, you should intercept the glideslope around 5-6 miles out I believe.
 
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Reply #2 - Aug 9th, 2012 at 4:35pm

bifo   Offline
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Thanks for replying. Yes your quite right trying to be too clever FL290 is flight level 29000 feet. Meant the glide slope capture height, Which you have clarified. so you add sea  level to the chart height given ~ which general rule of thumb is :- 2900 feet for many SIM airports. Plus airfield above Sea Level ~ Thanks Dave Smiley
 
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Reply #3 - Aug 9th, 2012 at 4:40pm

bifo   Offline
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Just a quick addendum to that :- if an airport or airfielld is at 3000 feet (< i know thats unusual LOL) I now add 2900 for the 'normal' glidslope capture height  ?? right
 
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Reply #4 - Aug 9th, 2012 at 7:16pm

DaveSims   Offline
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bifo wrote on Aug 9th, 2012 at 4:35pm:
Thanks for replying. Yes your quite right trying to be too clever FL290 is flight level 29000 feet. Meant the glide slope capture height, Which you have clarified. so you add sea  level to the chart height given ~ which general rule of thumb is :- 2900 feet for many SIM airports. Plus airfield above Sea Level ~ Thanks Dave Smiley



Ok, now I'm understanding better.  If you are using an approach plate or chart for your approaches, the altitudes given on the chart are above sea level, you do not add the elevation of the airport.  The elevation above sea level is already factored in on the chart.  Otherwise, if you are just using 2900 feet above the ground as your normal height for intercepting all ILS, then you do need to factor in the elevation of the airport. 

And typical approaches usually have you intercept the glideslope at 2000 feet above the ground, at the outer marker.  For instance, at my home airport of KMCW, field elevation is 1213', so the approach plate indicates an intercept altitude of 3200'.
 
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Reply #5 - Aug 10th, 2012 at 7:07am

bifo   Offline
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Thanks for that Dave Wink
 
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