Okay, this may have already been answered above, but just to clarify I'm going to present an acutal situation that happened to me. I went for an aircraft checkout at an FBO and the beacon on the tail turned up being burnt out which I found during preflight. I notified the CFI doing my checkout and at first he was a bit hesitant, but then he said the wing strobes were sufficient for anticollision lights, hence the tail beacon was out before the flight began. Was this legal?