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Home > Archive > Flight simulator > July 2005 > Autopilot and ILS crashes 747
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Autopilot and ILS crashes 747
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| Sammy Yousef 2005-07-05, 8:35 pm |
| Hi,
I'm relatively new to FS2004, and I'm just trying to learn to land the
747 using ILS and autopilot.
I've set up a flight where I'm just about to capture the glide path at
2000ft at Sydney airport. I have no problem capturing the glide path.
Alt switches off on the autopilot when I intercept. However the
autopilot was crashing the 747 on landing. It was bobbing the aircraft
up and down slightly, which I believe was causing the problem. I started
speeds from 140 knots to 200 in increments of 10. 140 falls out of the
sky. 170 crashes, 150 is perfect (no crash).
Is this a bug or am I missing something vital? Does a real ILS behave
this way? Is there an easier way to determine the correct speed?
Forgive my ignorance if I'm missing something obvious
Thanks,
Sammy
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| R.V. Gronoff 2005-07-18, 3:32 am |
| Sammy Yousef a écrit :
quote:
> Hi,
>
> I'm relatively new to FS2004, and I'm just trying to learn to land the
> 747 using ILS and autopilot.
>
> I've set up a flight where I'm just about to capture the glide path at
> 2000ft at Sydney airport. I have no problem capturing the glide path.
> Alt switches off on the autopilot when I intercept. However the
> autopilot was crashing the 747 on landing. It was bobbing the aircraft
> up and down slightly, which I believe was causing the problem. I started
> speeds from 140 knots to 200 in increments of 10. 140 falls out of the
> sky. 170 crashes, 150 is perfect (no crash).
>
> Is this a bug or am I missing something vital? Does a real ILS behave
> this way? Is there an easier way to determine the correct speed?
>
Nope, jumbos land at 150kt. In case you're a bit too high on the slope,
add 10-20kt then slow back to 150 when you're at the right alt.
Just for your knowledge: normal twin jets commercial planes (b737,
a320...) land at 135kt and private jets at 125-130.
--
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