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A friend of mine had finished building an E-Racer in which he installed a
supercharged engine.  During test flights, he discovered that he could not
adequately cool the engine.  So... he ripped out the engine, cut the back of
the airplane off, rebuilt the cowling and installed a supercharged I/O 540.
He thought this was a minor change since, after some adjustment, the weight
and balance was "similar" to the original and he was going to fly it under the
original air worthiness certificate.

I finally convinced him to contact the FAA and he agreed after reviewing my
experience with them.

The FAA thought the change was significant enough to re-inspect the engine
installation, which they did, and issue modifications to his certificate.
These modifications were to the limitations section requiring him to fly
additional time (6 hours, I think) and perform something like 6 take-offs and
landings.  The successful completions of these actions will result in an
airworthy experimental aircraft.

Notice that this was an amendment to his certificate, not a re-certification.

Having trouble with the FAA?  Move to the Chicago Region.....


Scott Krueger
N92EX