Justin Gombos wrote:

On 2007-05-24, Newps wrote:

You got an STC for that biodiesel? Didn't think so.


This was brought up earlier here, and someone said biodiesel doesn't
need to go through any process to get FAA approval. Supposedly the
fuel only needs to meet the standards required by the manufacturer.

I'm not sure what an STC is.

The engine is certified for jet fuel so that fuel is OK. Now you want
to use a different fuel. You have to prove to the FAA that the fuel you
propose to use meets the engine makers requirement. That alone will
take thousands of dollars and years to accomplish. Now you're going to
tell the FAA your going to be homebrewing this concoction in your own
big vat? No way, no how.