Twistedenginestarter, Very valid point, but who gets the power to take a licence off some body? An examiner? 2 examiners who have both agreed the flying standard is so low that the licence should be removed or the pilot grounded until futher notice?
Very hard one isn't it. As far as I know the only way to stop someone current flying is to pull their medical.
If I don't feel safe flying with someone I talk it though with them and suggest training. If as some do they think I'm wrong I will NOT sign their log book or licence and will inform the club CFI so they don't fly solo. If they are part of a group i's a bit harder but often there is a chairperson or co-ordinator who can ground them.
A bit messy isn't it!
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AP