Taxying Aircraft
What authority do engineers (who do not hold pilot licenses) taxi aircraft under, in particular on licensed aerodromes? I suppose on private strips it is completely at the discretion of the land-owner.
Student pilots are only permitted to taxi aircraft under the authority of a FI and for this they are operating the aircraft 'SOLO' and must also hold a medical certificate and have passed the Air Law exam.
If a Chief Engineer held a FI rating then he could obviously authorise his LAE's etc. to taxi aircraft but what about those cases where CE's don't hold FI ratings?
Or is there some dispensation for taxying which I've missed?
Cheers for any info.