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stesma54

ILS Landing question

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Hi everyone,i know this is a silly question but i'd like to know :wich is the correct procedure to intercept the localizer?. I tried almost anythig but nothing. once the glideslope green dot appears but the plane keeps floating above the runway,another time the green dot goes from up to down and the plane keeps floating. I got the Bert's GTN 750 mod. Help please!!!

thanks in advance

kind regards

stefano smania

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Basically, your problem is related to proper throttle and airspeed management.  On this and other small sim jets, you will need to shoot the approach at approximately 140 knots.  This should give you an appropriate rate of decent and a smoother glideslope.  This is a little unrealistic, because the landing speed is approximately 120 knots or less.  So at the Initial Approach Fix (IAF) make sure you are at 140 knots while maintaining assigned altitude until the glide slope is intercepted.  Then you will need to adjust the throttles as needed for flaps and gear.  I normally put the gear down at the outer marker, or final approach fix.  I also have approach flaps set by this time.  Once I get to minimums and the landing is assured, I select final flaps, forget about the glideslope and reduce speed to landing speed.  Also note that ILS systems are more sensitive the closer you get to touchdown.  The glideslope will also flare or level out approximately 50' or so above the runway.

 

If you are shooting a full approach with a procedure turn or holding pattern prior to final approach, use your holding airspeed.  Use an airspeed of about 160-180 knots, then slow to 140 and apply initial approach flaps on the inbound leg of the approach.  Then follow the guidance above.  Essentially, you don't want the airplane too dirty (with gear and flaps).  If you are in foul weather, especially with icing conditions, you don't want to pick up additional ice on the landing gear.  Minimum holding pattern speed would also be a good idea as well so you don't take up more airspace than needed when in a procedure turn or holding pattern.

 

One last note:  The throttle does more than control airspeed.  It also controls rate of decent and climb, and the pitch of the aircraft controls the airspeed.  This is a skill learned in basic flight instruction.

 

Hope this helps...

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Ok thanks Gary, I'll try as you suggested. Anyway it's a little more complicate than doing the same thing in a C182 where you only need to set the ILS frequency and press APP on the Auto Pilot. Is there any other tip? i mean...i watched a video and the guy set the AP in Heading mode first, then the Course indicator?

thanks again

cheers

stefano smania

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