On Sat, 26 Aug 2006 03:12:20 +0000 (UTC), Alan Gerber
wrote in :

Larry Dighera wrote:
I agree with your reasoning, but regulations only instruct the
controller to provide the VFR traffic advisory; they don't require the
controller to be concerned if you see the traffic or not.

It depends. At the Class D airport where I fly, the controller won't
clear you to land behind somebody until you report them in sight. When I
report "negative contact", they'll give me periodic updates until I spot
the traffic; once I do, I get cleared to land.

Not that they mind "looking" instead of "negative contact". But the
latter is still the *correct* call.

What you say is true, however I was referring to en route VFR radar
traffic advisory service.

The situation you describe on approach is a result of the controller's
necessity to separate IFR traffic which can be either radar separation
or visual separation.