runway level

[rashers]

hi lads can anyone sort out this problem for me when a aircraft coming in to land it never goes down to ground fully is there a setting i go in to thanks

[RodBearden]

You need to set the QNH for that airfield. Go to the SmartView tab and enter the correct airfield at the top, then make sure the Auto Set QNH box is ticked.

That should help.

Rod

[DaveReid]

Although bear in mind that, with the QNH set, the height shown just before touchdown will be the airfield elevation, which probably won't be 0ft.

[rashers]

i will try that thanks lads for ter help

[rashers]

i hav tried this lads still no joy any other suggestions when the planes is landing it shows the plane is still up in the air

[DaveReid]

i hav tried this lads still no joy any other suggestions when the planes is landing it shows the plane is still up in the air

What airfield are you talking about ?

[rashers]

shannon ireland

[tarbat]

To confirm, you put EINN on the SmartView tab, and ticked the auto-QNH box.

Can you actually receive aircraft all the way down to the ground?  And remember, they will stop at 46ft AMSL.

[rashers]

i cant receive them all the way down to the ground that answers tat stops at 46ft another one how do u take sreenshots im not that great at computers just i have a busy day over ireland with us traffic i want to post them tarbat thanks for ur help shannon ireland

[DaveReid]

It occurs to me that I don't know how RB QNH adjustment actually works (I don't use it), can someone enlighten me ?

Given that aircraft report height/altitude to the nearest 25 or 100ft, relative to 1013.2mb, is the QNH-adjusted height still shown to the same precision ?

[tarbat]

http://www.airnavsystems.com/forum/index.php?topic=1048.msg7942#msg7942 probably doesn't fully explain it :(

[AirNav Support]

It is still to the nearest 25ft after the adjustment.

[DaveReid]

http://www.airnavsystems.com/forum/index.php?topic=1048.msg7942#msg7942 probably doesn't fully explain it :(

You're not wrong there - I'd forgotten about that thread, but that seems to be all about pilots twiddling things in the cockpit and affecting the altitude transmitted, which I don't think is the case.

Though come to think of it, twiddling the throttle and stick might have an effect :-)

[tarbat]

You're not wrong there - I'd forgotten about that thread, but that seems to be all about pilots twiddling things in the cockpit and affecting the altitude transmitted, which I don't think is the case.

I'd assumed it was the case, but might well be wrong.  Doesn't what the pilot set as the pressure on the aircraft's altimeter affect what altitude gets transmitted?

[DaveReid]

Doesn't what the pilot set as the pressure on the aircraft's altimeter affect what altitude gets transmitted?

Not as far as I'm aware - after all, if the transmitted altitude reflected the QNH set by the pilot, then there wouldn't be any need for RadarBox to make any further adjustment.

If you have access to raw data, one of the ELS DAPs (register BDS4,0) includes the actual QNH (in mb) set by the pilot, at least in the case of Airbuses, although many Boeings send a fixed value of 1013.2 even below the transition altitude.