Originally Posted by
Speedwinner
X-Check with GPS Altitude plus radar readout. so static ports were not involved. So keep it on?
The problem with this is that all you know is that at that particular moment in time you have an altimeter that agrees with GPS altitude. Air data problems can be quite insidious in that a faulty system can provide seemingly accurate data at one moment in time, at a specific speed and altitude. This is why Airbus recommends that you switch off all three and rely on the BUSS if fitted.