Originally Posted by
lurkio
Get below 10,000', bleeds off, packs off, open the outflow valve and use cabin alt as an altimeter. Even get a VSI thrown in for nothing. Probably closer to reality than GPS alt.
Airbus should know better. They display GPS altitude on the BUSS. So can't be that bad. Better than depressurize and freeze passengers. Unreliable speed is bad as it is managing a descent to preserve passenger's eardrums, well! Possible in the sim may be.