Bar on the first floor
 

Cirronimbus

Did they happen to mention the bar is actually connected to the outside world and the electronics has an offset to correct the height anomally?
They should have. QNH, QFE & QFF from there is all correct, only the bar display is slightly out of reality.

Hi Pharcarnell.

The bar in that office is NOT connected to the outside atmosphere. That is why I thought the way they measure the pressure was dodgy. The QFE reading is also wrong as they use the pressure inside the office on the first floor WITHOUT any correction to runway threshold level. I guess that since no one has pranged a plane on landing, that the QNH value is reasonably correct. However, the method of measuring pressure in Darwin is definitely dodgy. Perhaps it is only a matter luck no one has crashed (yet)? Makes me wonder if they measure the pressure the same way in other met offices?

I learned with QFE. The problem is you have to use QNH as well. There you are trying to work out when you should be on QFE or QNH, tying to work out the difference when you get to the airfied, setting and resetting QNH and QFE, 'err err errr, now what was that, QFE or QNH?...' the potential for errors is enormous. One of the silly things about flying in the UK. QNH:ok:

Cirronimbus I am not familiar with RAAF procedures but Airservices Towers use their own pressure and temperature instruments. They used to be inside a Stevenson Shield a few metres away from the TWR but things may have changed. The civil controllers are also met observers and do not rely on BoM for anything other than METARS and TAFs.