This doesn't seem to be plain English, could someone explain this with a simple example for me please? I'm not sure what 'Leave clear on it's left' means, and it's not clear whether the subject of the sentence is 'A flying machine [etc.]' or 'An aircraft that has landed' (i.e. who's left are we talking about)
Landing and take-off
(2) If take-offs and landings are not confined to a runway—
(a) when landing, a flying machine or glider must leave clear on its left any aircraft which has landed, is already landing or is about to take off;
(b) a flying machine or glider which is about to turn must turn to the left if the commander of the aircraft is satisfied that such action will not interfere with other traffic movements; and
(c) a flying machine which is about to take off must take up position and manoeuvre in such a way as to leave clear on its left any aircraft which has already taken off or is about to take off.
I've tried searching for the term online but only seem to be able to find excerpts from the legislation.