[Solved] cabin alt shown has a negative.

[LordNC]

How do I fix this, my cabin alt is showing -500.

[LordNC]

[flamesies]

Hey,

 

What airport are you at, and what's the current weather?

[LordNC]

KOPF, its at -300 right now KOPF 082353Z 07011KT 10SM FEW025 SCT032 BKN043 24/19 A3030 RMK AO2 SLP261 60000 T02390194 10267 20233 53013

[oldflyguy]

Yes, I'm looking at the same display.  It varies but always in the -100's of feet.  I've tried it with both persistent and career modes, and with default XP RW and Active Sky.  I'm going to try a re-install of the model and will report back.

[oldflyguy]

Well, tried the re-install but the issue/bug remains.  I'm sure someone else will bring it up (can't be just the two of us) and we will get an answer/fix soon.

 

[Graeme_77]

Thanks for the reports. This is not a bug. The cabin altitude on the EICAS is reported as a pressure altitude (i.e. what you would see with the baro set to 29.92/1013). It's odd Bombardier chose to do this, but that's how they did it.

When you set the pressurisation panel on the overhead panel, you're telling the pressurisation controller where the ground level is to make sure the cabin depressurises, so for that reason the check on the ground is the deltaP value being zero, not the cabin altitude.