Air Blower in 680FP

[ghancock]

I've got conflicting stories about my blower unit in my 680FP and wondering if anyone knows anything about it or how I might test it to see if its working.  It blows cool air out for the first 3 or 4 minutes and then turns warm after that.  So I suspect its sorta working and I'd like to get it 100% before spending money on an air conditioner if I don't need it.

Thanks,

Glenn

[donv]

Can you explain how the system works? Is this an air cycle machine, where it cools the air by expanding it?

[ghancock]

I'm not really sure about the exact process the air goes through.  Still trying to learn all of that.

[Willis]

Have a look at the Unit.  Is it a Sundstrand?

[donv]

You might give Geoff Pence at Twin Commander a call. I'm sure he could explain it, and if he doesn't know off the top of his head he has all the documentation he needs to find out.

[ghancock]

Thanks,  will give that a try.  I don't have the plane or the service manuals atm so no idea what it is. Morris said he had some manuals he'd send me but he's so busy and I don't like bothering him if I don't have to.

Glenn