True, but often they have an AWACS or military ground radar.



"Larry Dighera" wrote in message
...
| On Sun, 30 Jul 2006 08:28:06 -0500, "Jim Macklin"
| wrote in
| Mt2zg.84637$ZW3.19317@dukeread04::
|
| You do clearing turns, shallow turns and you look for
other
| airplanes. Airplanes at your altitude look to be on the
| horizon, airplanes above you are above the horizon and
| airplanes below you are below the horizon and are harder
to
| see because of the ground. But you look for moving
shadows
| on the ground at low altitude. You run all you lights
and
| hope the other guy is also. You look out the windows.
You
| look for small dark spots that don't seem to move because
| things on a collision course have zero relative motion.
|
| But the human eye seems motion better than it does small
| dark spots.
|
| In areas of high traffic, there are often radio
procedures
| used to announce intentions. There are IR detectors that
| can "see" the strobe lights on an airplane and they do
have
| systems that can detect the transponder of other
aircraft.
| And they are developing data-link systems that will put a
| ground based radar display in the cockpit of those
airplanes
| and countries that can afford the cost.
|
| Military flights, though exempt from FAR § 91.117's 250
knot maximum
| speed restriction below 10,000', do not detect Mode C
transponder
| beacons (no TCAS).
|
|
| [rec.aviation.military added]