AMC1 SERA.5005(f) Visual flight rules
CAA ORS9 Decision No. 1
VFR MINIMUM HEIGHTS — PERMISSION FROM THE COMPETENT AUTHORIT
The competent authority should specify the conditions under which the permission is or may be granted, including the minimum heights above the terrain, water or the highest obstacle within a radius of 150 m (500 ft) from an aircraft practising forced landings, a balloon or an aircraft executing ridge or hill soaring.