CEET Duct

[westcoastoz]

I am just in the process of getting all the required parts together for the 912ULS 5 year Rotax rubber replacement and am wondering if anyone knows what FD have used for the induction manifold ducting?

It sure looks like 3" CEET duct (#05-30512) however my A&P has questioned it's suitability for negative pressure situations such as induction to a carby.

 

I have attached the duct manufacturers information sheet:-

[Roger Lee]

Hi Dave,

 

It is indeed 3" CEET ducting and it works very well under negative pressure. It has a wire winding inside for stiffness.

The heating duct on top of the muffler that feeds the cabin heater is 1 3/4" CEET duct. You need to buy 3 ft. of the 3" and and 24" of the 1 3/4" duct. tell your A&P it's the right stuff.

 

Here is the Aircraft Spruce link.

 

http://www.aircraftspruce.com/search/search.php

[westcoastoz]

OK thanks Roger. Does the CEET duct have a lining inside or is it rippled? I think there may have been problems in the past with the SCEET (red duct) as the lining has separated under negative pressure and caused obstruction to the airflow.

 

Hopefully I can source some CEET locally as I am running out of time fast.

 

Regards,

 

Dave

[Roger Lee]

Hi Dave,

 

There are two layers to this ducting, but if you put it on correctly over the air intake mounts then it can't separate and I have never seen any of this cause a problem in a CT.

[207WF]

We had to replace the factory original (black) ducting on mine with a better (orange) version. The black was flaking off into the carb. and I made one "interesting" landing with fuel smells in the cockpit and a rough running engine that seems to have been caused by this. WF