On-ground Pressurization Test

[Stratus337]

Thanks James. I have an inverter pack and fog machine (kids' haunted house). What I'm trying to figure out is the best way to use the leaf blower to get air into the cabin to provide some pressure. Can I simply "connect it" to the air inlet near the cabin on the leading edge of either wing?

I assume the master switch will need to be on to allow the outflow valve to close? I'm at 1,000 feet here so I assume I dial it to the lowest position before trying to pressurize.

I should be able to fill the cabin with the fog and shut the door before blowing in air. Making sure the outflow valve closes and actually getting the air into the cabin are really the only two things that I need to figure out.

I'm likely going to end up at a shop, but would like to do a basic test to see if anything obvious jumps out before committing to spend that time and money.

[JeffAxel]

The outflow valve is closed with the power off. When you put the pressurization switch to "on", it takes power off that valve and the valve is closed, allowing pressurization. When you switch to "off", it sends power to the valve opening it and preventing pressurization. The P337 pressurization system is completely pneumatic, doesn't need any electricity to pressurize the cabin.

[JamesC]

System is passive so battery switch can be off unless you have an electric door seal. That is why power failures at altitude in unpressurized mode can cause the cabin to pressurize suddenly, when the dump solenoid loses power.
I haven't done it but if I was doing it I would connect the blower via some kind of adaptor hose to the hose (after the inline venturi) entering the cabin through the firewall. eg. see attached for what the front engine part looks like. Note you would likely have to pull the rear engine dump valve as this also closes the connection from the cabin to the non-running engine.
Good luck - let us know how it goes.