wrote in message
oups.com...
The problem I have is, there are aircraft that are mentioned in ADs.

In airworthiness directives? Or advertisements?

I might be very interested in them (we are looking for a reasonable 6
place). But I don't know anything about them. How is one to know if a
plane is a single engine with 6 seats or a twin with 2 seats? Now if
they put a picture with their ad...

I'm not sure how this relates to this thread at all. Are you asking about
advertisements on Usenet?

Meanwhile, how does ATC know what a Caravan is versus a Sky Bus versus
a Tiger? It sure makes a difference to them when doing spacing for
approaches in IMC. It also helps departure control when you have some
idea of climb speed and rate of climb. So this means that this
information is available somewhere.

No, it doesn't. ATC contacts a variety of aircraft, and so a controller is
generally familiar with most of the common ones. But uncommon ones they
won't necessarily know what kind of performance to expect. They can get an
idea simply by observing the aircraft, and of course basic performance
minimums can be expected when more detailed information is lacking. Or they
can simply ask the pilot what performance the airplane is capable of.

I'm still a little bewildered as to how this relates to the thread about
posting to Usenet.

Pete