I just finally got most of ILS and landed thanks to Paul2k10... anyway,

After doing his tutorial on his website, I tried to land at LAX. Well, I found the nav1 number (runway freq), but the nav2 number (ATIS number) is way too big to enter into the airplane. I'm flying a 737, and LAX says it is 133.800, but the numbers only go up to 115 or so.

What am I doing wrong? Also there are 2 ATIS numbers listed, but both are bigger than I can enter, I'm just wondering with airports that have 2 numbers each, which one do I use??

This looks like a continuation of the prior post so I have a question for Paul.

I read your tute and you say to plug the NDB frequency into the ADF.  But you never mention the NDB again.

So what does an NDB do?  Measure distance?  I never understood those things so I don't use them.  If it just measures distance can't I just use a VOR instead?

Why would you want to enter the same frequency into both radios?  Kind of defeats the purpose of having 2 radios.

You must have your autopilot (VOR or ILS) frequency in NAV1 because that's the only radio that can control the autopilot.

ILS is a very short range signal - 10-20 miles - but directional. You have to be within about 30 degrees of it to find it.  It has the glideslope information that's going to land you.  VOR is longer range 100+ miles and Omnidirectional.  There may not be a VOR beacon right on the runway but there will be one pretty close.

Assume you're 100 miles from your airport and within VOR range.  Now you can fly on autopilot relative to it.  This frequency needs to be in NAV1 so autopilot can respond to it.

You want to fly towards the VOR at a certain heading (it's called a radial but that's too technical).  If your runway is 90 degrees you want to fly towards it on a COURSE of 90 degrees.  So set your COURSE HEADING (in jets it's NAV HEADING) to 90 degrees and set your autopilot to NAV or NAV HOLD.  NAV HOLD will fly you towards whatever radio is tuned to NAV1 at whatever heading is set in COURSE HEADING (or NAV HEADING).

Once you have a stable course (90 degrees) to the VOR you can turn your heading selector to that heading and switch to Heading Hold (HDG).  Autopilot will ignore the NAV1 radio signal and fly on that heading.

But you want to know how far away you are so you put the VOR frequency in NAV2.  DME2 will now tell you how far away you are.

Since NAV1 and COURSE (NAV in jets) are now unused you can set NAV1 to the ILS frequency and COURSE (NAV in jets) to the runway heading.  Autopilot is still on HEADING HOLD but when you see the glideslope and localizer become active you can switch autopilot to APR (Approach hold) at your discretion.

Hope that clears up a few questions.

Now if someone could explain the NDB thing.

I hope I got it right.  Can somone PLEASE explain that NDB thing, cuz I just flew & tried to work it and I have no idea what it does.

Can you give me the unabridged version.  Like, what's the difference between a NDB and a VOR.  Can't tell from your explanation.

I tuned in a NDB on my ADF and it didn't do anything.  It just sat there with the frequency showing, which, incidentally, was a total pain to tune.

This is getting a little off topic so I'll just start a new topic.

because I'm a newbie! I used Pauls ILS tutorial but mistakenly thought the nav2 number was the ATIS number...

anyway, I got it all figured out now and can sucessfully use ILS landings

I'm not a newbie anymore! (I think)

Quote:


When you dial in the NDB frequency into your radio the yellow needle in the ADF indicator instrument will swing to point in the direction of the Non Directional Beacon...

Very useful as a quick quide as to the direction you need to fly, just swing the plane so that the arrow is vertical.... ...!

Cheers all...
Paul.
(England).

Quote:


LOL...!
I know Sean... ...!
NDB's...it's all to do with 360 degree radials.... ...!
But...
...the only radials I get really excited about are the 9 cylinder, 360 degree, chuff-chuff type, up at the pointy end of the plane...
LOL...LOL...LOL...!
...anyway...
Here is Fozzers Radio Pic to illustrate the point again...
..always nice and handy... ...!



Cheers mate... ...!
Paul.
(England).