Indeed, I can't see anything preventing two aircraft being on the runway at the same time.
(The thread viewtopic.php?f=54&t=72650&p=686414&hil ... ng#p686414 explored that latter issue a little.)
A typical example is for light aircraft at some longer runway with no taxiway. A/c 1 lands and starts to backtrack. A/c 2 is on final. It is probably a good idea to call that they have a/c 1 in sight, or also that they are landing "with the option" (?). That rightly keeps #1 from getting scared.
If #1 clears the runway in time, great, #2 can land. Otherwise, #2 would typically go around.
But is there any reason #1 can't land long, past the backtracking aircraft, to improve efficiency of operations?
It doesn't violate rules about risk of collision if one leaves space. I don't know what distance to keep between aircraft, or what rules there are for that. But it would seem to be reasonable to pass by the first aircraft by at leats 200 ft, similar to the distance between a holding point off the runway and the runway centreline.
Landing infront of the other aircraft (unless there are thousands of feet to spare) may scare the other pilot, since it appears hazardous and unexpected. But why not have #2 fly by #1, well off to the side of the runway, and then jink back to the runway and land? (Assuming there is time for a stabilized approach still.)
I think I've seen a pilot get upset about this sort of thing, thinking it is illegal, but I can't find what rules might have been broken. Unorthodox, yes. But not unsafe.
Just trying to understand how to fly more efficiently, while still being legal and conforming with reasonable norms.
I'm also having problems understanding the implications of the part of CAR 602.19 on right of way, which states:
That means you don't pull out onto the runway infront of someone about to touch down.(7) Where an aircraft is in flight or manoeuvring on the surface, the pilot-in-command of the aircraft shall give way to an aircraft that is landing or about to land.
But we normally allow someone to land and backtrack before trying to land on the same runway. If you are in the circuit and following a bit close to let the landed aircraft clear the runway properly, you go around. But that CAR would imply you keep going and force the airplane on the runway to fast taxi to the far end or turn off into the grass -- although you can't create a hazard in any case. What allows a landed aircraft a reasonable opportunity to get clear of the aircraft behind? Before landing, the first aircraft had the right of way, and then suddenly it has lost it.
So I'm missing understanding something between that CAR and standard practice.