Hi,
I have simmiler question. Today happend to me. One of the pilot was radar vectored for the ILS approach and at minimum radar vectoring altitude requested to descent visualy to join ILS. Some ATCOs allow this, instructing an aircraft to maintain ground contact(terrein clearance) and to report established. I do not do it. I have never been told to do so during my education but I saw some ATCOs in neighbouring countries do it. Who can tell me if it is allowable or not taking into consideration ICAO rules.
Thanks in advance,
Regards