how to do an ILS landing????

[Mehdi Debbabi 970089]

hi all,

 

I have been trying to learn how to do an ILS landing in x-plane, and never seam to work for me and not sure what I'm doing wrong.

here's an example.

 

trying to land in YSSY rwy16R, I do know the ILS freq is 109.50 so I push that into my NAV1 and activate it.

then I have the GS (glide scope) actived in my A/P. and nothing seams to happen when I'm looking right down the rwy.

 

Can someone please help me out.

 

Thank you[/i]

[Peter Nolin 954217]

You might wanna read the autopilot guide found at x-plane.org http://forums.x-plane.org/index.php?showtopic=10894

[Mehdi El Baoui 964257]

i think the mistake that you did is that you click on the gs button instead of the app button or the vor loc, but it's not only sufficient to do a complete approach for landing, because your speed should be taken in consideration as well as the flaps and the course also should be set in your MCP...you should know that each plane has its own procedure for landing and there are some that lands with both ap engaged and others with one...so i think you should read well the instructions in the airplane manual of the plane that u fly and if you need more help try to find a site on the net (i don't remember it now) which descibes landing approach on fs with screenshots.

[Mehdi Debbabi 970089]

Thanks all.

 

I just needed some basic help.

I'm reading up now.

it's hard to find any manuals for x-plane that's all.

 

cheers

Mehdi

[Joe Chou 980766]

The buttons GS and APP, I think, are generally the same and are not both present in any given autopilot.

 

One thing I've noticed is that the glidescope autopilot tends not to activate unless intercepted from below, which is how it's supposed to be intercepted anyhow. In X-Plane, from the drop down menus, if you select ILS final to a particular airport / runway, often it starts you ABOVE the glide scope, so it's difficult to get the glidescope to activate. (I.e., you have to dive down, under the glide scope, level off, and then re-intercept it from below. It's a pain.)

 

Another tip that helped me is to have both the horizontal and vertical ILS landing buttons "armed", while using the ILS autopilot functions "armed."

 

For example, say you are trying to land on ILS Rwy 4. Here's how I might try setting it up. BEFORE you've intercepted the ILS:

 

- tune your NAV1 radio to the correct frequency

- make sure your autopilot will be getting input from NAV1, and not from a GPS / FMC, or you'll be in for a rude surprise. (Yes, I do this repeatedly.)

 

- use your autopilot "ALT" button to hold you at an altitude of, say, 2000 feet, BELOW the glidescope (it helps if you download the ILS approach plate, and start off at the proper waypoint, altitude, and heading)

- click the APP or GS button, which should glow amber, as it is "armed"

 

- use you autipilot "HDG" button to hold you at a course that's around a 5 or 10 degree intercept to the localizer

- for example if the runway is on a bearing of 40 degrees, and you are to the left of it, have your heading bug set at 45 to 50 degrees

- click the NAV button, which shoud glow amber, indicating it is "armed"

 

So, now you've set yourself up to hold an altitude of 2000 feet, and a set heading. As you fly along, you should intercept the horizontal localizer first, the HDG button will turn OFF, the NAV button will change color from AMBER to GREEN, and the autopilot will now handle keeping you on the correct heading.

 

Continue on, and when you intercept the vertical glidescope from below, then your ALT hold button will turn OFF, and the GS/APP button will change from AMBER to GREEN, and the autopilot will keep you descending at the right angle. When you've intercepted it, to prevent yourself from gaining speed, you should decrease throttle, extend flaps, and/or lower your gear, to keep you at an appropriate approach speed.

 

Adjust throttle all the way down, as needed. Flare when appropriate (I still can't do this reliably to stall just above the runway.)

 

Hope that helps. Caveat -- I'm pretty new at this, but it seems to work for me.

[Mehdi Debbabi 970089]

Joe,

 

thank you for your time and input to this subject.

now I have a very good idea on how to do an ILS landing.

 

Cheers

Mehdi

 

[Nick Comber 959257]

I love your name!

[Joe Chou 980766]

Joe,

 

thank you for your time and input to this subject.

now I have a very good idea on how to do an ILS landing.

 

Cheers

Mehdi

 

 

Yeah, well, fat lot of good it did me 20 minutes ago, when I crashed and burned on a short final into Boston Logan, ILS to Rwy 22L... On VATSIM... With many witnesses, I'm sure...

 

[ Note to self -- an extreme drop in throttle on short final, to slow down, to give more time to think, while trying to TYPE to ATC, does NOT work if you slow below stall speed, the autopilot is still set to hold an altitude and keeps trying to pull up, so adding throttle back doesn't get you out of the stall because you need to nose down a bit, and the autopilot doesn't let you... I need to try VATSIM with a microphone... dang dang dang dang... so much for flight #4 on VATSIM. ]