Le Pingouin, you say that aircraft frequently fade from radar. How often does an aircraft fade from radar that requested a clearance at 6,500 feet – probably above the weather and certainly above the mountain range – and is then forced down into bad weather, without anyone being interested?
Capn Bloggs, no there is no ICAO requirement for C to be radar controlled. No doubt it is understood that if it is not radar controlled, pilots of VFR aircraft will be told to “keep out” – what happened this time. As I said, it is a giant “road block” in the sky that has now resulted in people losing their lives.