Hi Brent,

Thanks for your reply on the IV-P pressurization.  I found it quite helpful and informative as I figure out the pressurization system. 

From my limited testing so far (flying at 10-12k), I've noticed that the pressurization isn't linear.  At 10k my cabin altitude (according to the indicator) is 5k and the PSI is perhaps 2 or 2.5 differential...  since the POH suggests a 8000' cabin at FL220... I am surprised that I can climb an additional 12k and have the cabin altitude only rise an additional 3k.  I was flying at 31" / 2500.

How do you check for leaks on the ground?

thanks,

Dico