Thanks for the replies, Chris and Jim. For the record, my Schleicher
ASW-19B is Type Certificated. It's disconcerting that the FAA
officially documents it as having an amateur built, experimental
engine, because there is no STC! I once worked for a huge US
bureaucracy that believed their paperwork rather than their victim's
lyin' eyes, so I have visions of undergoing the mother of all ramp
checks someday! Jim, can I have a contact number? grin

Seriously, Jim, is there no way of getting these engine entries
changed? I checked a couple of ASW-19 registrations; it was split 50/50
between NONE in Engine Manufacturer and Engine Model, and AMA/EXPR and
UNKNOWN ENG like I have. Some were registered correctly years before
mine, and others correctly within a few months of mine. It almost seems
like a typo, which should be easily correctable (he said naively). Like
I said, I'm worried about undergoing the mother of all ramp checks...

On the other subject, I did check the status of my registration - it
says "valid". I agree with Jim, this is something that all US owners
should check out. AOPA has been putting out bulletins on this, too, so
it's clearly an area of active concern to the FAA, meaning that people
should take it seriously.

-John