150flivver wrote:
On Jul 8, 6:41 am, Mike Spera wrote:

They are R-12 systems in most planes...R-134? Many techs will not do a conversion because they can
screw up some systems irreparably. Even though many have converted
Pipers, the local auto tech has no experience and likely will not want
to "experiment" with a very expensive airplane...

Mike

I can't imagine that converting an R-12 system to R-134 wouldn't
require an STC.

I was not heading in that direction. My thought was that some R-12
systems contained some funky oil that turned to glue when R-134 oil hit
it. Hence, some auto guys will not do a "conversion" and risk getting
into a huge beef if the system gets all gummed up.

I would imagine that those same auto wrenches would also balk at going
to the local airport to "try out" converting a Piper from 12 to 134.

I would never suggest that a conversion would require and STC. But, some
FAA critter might.

Good Luck,
Mike