Simviation Forums

hi,

I fly in heavy metal planes(777,737,747)
And when I set the nav1 to the runway ILS\DME frequency
The autopilot lines the plane up with the runway as it should, but it dosnt control the glide slope, am i doing something wrong or do I have to control that manually???
The way I do it now is when the lights(i dont kno wot there called, lol) that are white or red are 2red and 2white i got down at around 700fpm. And is there a way to make the AP
control the Glideslope???

doodoo -

1.  Are you approaching from below the glidepath, at a fairly shallow angle (say no more than 40 degrees off the runway line)?

2.  Have you set the 'NAV/GPS' button to 'NAV'?

3.  Are you pressing 'APR', but leaving the 'HDG' and 'ALT' settings on until the autopilot turns them off?

4.  Are you reducing to say 180 knots, putting down 5% of flap, and dropping the gear as you get close to the glidepath?

If you're doing all those things, it should work fine  :)

doodoo -

1.  Are you approaching from below the glidepath, at a fairly shallow angle (say no more than 40 degrees off the runway line)?

2.  Have you set the 'NAV/GPS' button to 'NAV'?

3.  Are you pressing 'APR', but leaving the 'HDG' and 'ALT' settings on until the autopilot turns them off?

4.  Are you reducing to say 180 knots, putting down 5% of flap, and dropping the gear as you get close to the glidepath?

If you're doing all those things, it should work fine  :)

hey

can you please elaborate a bit more cause I am a bit of a
newb?

Nav's #2, 3, and 4 are pretty much self explaining.

As for #1: fly your pattern so that when you make 'your' final turn toward the runway/ils beacon you will intercept the beacon at a 30-40* angle, at a proper distance from the runway. (Ex: If the runway heading is 360 your heading to intercept would be 330 or 030 depending on the pattern).

Also you should have reduced altitude so that you are flying level and will intercept the glide slope from underneath. This will be indicated buy the g/s indicator on the HSI or VOR1 gauge.

A good way to experience the proceedure is to fly an IFR flight plan and take note of how ATC directs you to intercept the ILS.

This topic is also discussed a few notches down:
http://www.simviation.com/cgi-bin/yabb/YaBB.cgi?board=COF;action=display;num=1110603141

Cheers,
Dave

Sorry, doodoo - thought from the fact that you'd already got the ILS to line you up with the runway meant that you had most of it taped!  

Putting a bit more 'flesh on the bones'  :):-

The ILS gets confused if you come in at an wide angle to the runway.  It can sometimes pick up the 'back course' by mistake, which will leave you heading the wrong way.  So it's your responsibility to come in roughly in line with the runway.

The ILS can only intercept the glidepath from below.   If you come in above it, what happens is that the ILS 'captures' the line, but doesn't pick up the glideslope.  Which I think is what is happening to you.

The same thing happens if you leave the system on 'GPS' mode, which is what most of us use on long flights.  There's a button somewhere on the panel (different place in each aeroplane) that lets you switch, you need 'Nav' mode.

Once you've pressed 'APR', the system turns off the heading hold and altitude hold at the right times - you don't have to do it yourself (which also confuses the system).

The autopilot tends to work 'slow and steady' - think of it as a pipe-smoker who takes half an hour to read the newspaper!  So get the speed, gear, and flaps down in good time - rushing things can fool him too.

Apart from all that, dave's advice is good - fly a couple of full IFR approaches, and watch the way Air Traffic Control lines you up and the autopilot captures the line and glidepath; then reproduce that, and you'll be fine.

If you're still in trouble, call back - but I hope it will be OK now.  

cool, I havnt tested what you said but it is probably this

The same thing happens if you leave the system on 'GPS' mode, which is what most of us use on long flights.  There's a button somewhere on the panel (different place in each aeroplane) that lets you switch, you need 'Nav' mode.

THANKYOU!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
It now works, except the auto land landing me to hard and the nose wheel collapsing, LOL

thanKs

THANKYOU!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
It now works, except the auto land landing me to hard and the nose wheel collapsing, LOL

thanKs

...mmm....Yes you should have hit Z to cancel the AP when you were certain of hitting the spot...Then flare for the landing...well done....commoner

...mmm....Yes you should have hit Z to cancel the AP when you were certain of hitting the spot...Then flare for the landing...well done....commoner

ok will do!

[quote]
Once you've pressed 'APR', the system turns off the heading hold and altitude hold at the right times - you don't have to do it yourself (which also confuses the system).

Apart from all that, dave's advice is good - fly a couple of full IFR approaches, and watch the way Air Traffic Control lines you up and the autopilot captures the line and glidepath; then reproduce that, and you'll be fine.

Heya Mafia Tiger,

Exactly.  Follow the instructions above to intercept the ILS.  Depending on visibility, I will disengage the autopilot anywhere from 400 to 1000 ft. above the runway and then manually flare and land the aircraft.  As far as airspeed is concerned you have to do that yourself on an ILS approach.

"I fly in heavy metal planes(777,737,747)

Question for the day: which of the above is NOT a heavy?

Bill
Read more . . .

The 737, which is puny compared to the other 2 mentioned  :)

Where's my prize at!  ;D

Hi guys just wondering
how the hell do you get the plane to work with autopilot, and you know when you go down a glidslope.
it seems strange.. because i have been manually flying all my aircraft.
on VFR. are you using IFR or somthing?
How do i know when to tune my radio to the NAV or whatever it is i have to tune it to?
i think this would improve my landing if the plane lines it's self up with the runway

if anyone could help
i'd be truly greatfull

Daveuk

Hi guys just wondering
how the hell do you get the plane to work with autopilot, and you know when you go down a glidslope.
it seems strange.. because i have been manually flying all my aircraft.
on VFR. are you using IFR or somthing?
How do i know when to tune my radio to the NAV or whatever it is i have to tune it to?
i think this would improve my landing if the plane lines it's self up with the runway

if anyone could help
i'd be truly greatfull

Daveuk

..Hi Dave there is a post on this page which will help you get the idea.......commoner

http://www.simviation.com/cgi-bin/yabb/ ... 1110603141