I'm also puzzled as to why he didn't react to my presence. I would
think that his TCAS would have detected me. Nevertheless, there he was
- no course or alititude variation at all, he just flew right over me,
going _real_ fast. The other thing about it was that he wasn't on a
normal arrival path for PHL. I had my biannual VFR transponder check 3
weeks after this experience, and the Trig TT21 passed just fine. I
don't know what happened, but I hope not to be caught in a similar
situation again.

-John

On Sep 9, 5:14 pm, Darryl Ramm wrote:
Something is a little strange here as this seems well within the
altitude difference window that should have generated an RA. Which is a
big deal to the 737 crew both from the immediate required response to
the RA and subsequent reporting/paperwork.

Darryl