Hi all you fellow 727 lovers,

Right now this airplane is my favorite and I can't seem to stop flying it!  I've always had an affection for the 727 and this CS version is about the best there is.

I've spent quite a bit of time patching and fixing the various bugs and issues and everything is working okay (at least, no more buggy than the real thing was, to read the stories from actual 727 drivers here.)
Many thanks to all those that figured out the fixes and workarounds.

My only major issue now is the pressurization system total fail.  I fly with FSCaptain and it monitors the FSX pressurization variables to determine the comfort level of the PAX...and there are some very weird things going on with those numbers behind the scenes!!
My FO keeps telling me about excessive rates of climb and sometimes the cabin is over 10,000 feet!  The PAX aren't happy either, gasping for breath and with ears popping like crazy and headaches.

I could go on and on about all that's wrong with the system, but to cut it short I've written some code that replaces the broken stuff in both the CS gauges and in FSX itself so we almost have a working 727 pressurization system where the needles and knobs behave reasonably.   But I want to implement it accurately.

My question is:

How exactly is this old-style manual pressurization system supposed to work?  The CS documentation is of little help, and I haven't been able to find anything much on the internet.  I have a couple of 727 FCOMs but they describe the newer system that's automatic.

I see where you can set a cabin pressure goal of between 0 and 10,000 feet, and a rate knob where you can control the rate of climb.  Obviously you set your goal and rate and when the system pressurizes the cabin altitude climbs or descends towards the goal at the rate you set.  

The pressure gauge and rate of climb gauges seem pretty standard -- although the way CS has implemented the pressure differential/cabin altitude gauge isn't even close to right.

Anyway I have those working now.  But there is no FLT/GRD or pressure dump switch.  I have assumed that the system will pressurize when off the ground, and dump pressure when on ground.  Is this the way the original system worked?  Or did CS leave off a switch somewhere?  Or am I missing something obvious?

I also am not sure how to accurately implement the manual pressure control.   I guess that if you have the needle in the "auto" range the system will work as described above but if you get it out of that auto range you will force a climb (or descent) at a rate you set with the manual pressure control and the usual rate knob and cabin altitude setting will be ignored.

If my assumptions are correct (and please let me know if you know how this worked or can point me to some docs) I'll post a link to the code and installation instructions so you too can have a working pressurization system until CS fixes it if you're willing to install a simple gauge and replace one of the CAB files with a fixed one.

Also, in figuring this out and tracking the internal FSX pressure variables I have a detailed knowledge of what's wrong with the way CS implemented this.  But that's another loooong post, if anyone is interested.

Thanks for a great product though!  I've totally enjoyed it so far.  There's no way I'd go to all this effort if it wasn't worth it.

Dutch