91.243 ATC light signals

• Each pilot of an aircraft shall comply with the clearance or instruction specified for ATC light signals in Table 1.

  Table 1. ATC light signals.

  Light Signal	Aircraft in Flight	Aircraft on the Ground
  Steady green	Cleared to land	Cleared for take-off
  Steady red	Give way to other aircraft and continue circling	Stop
  Series of green flashes	Return for landing (clearance to land and to taxi will be given in due course)	Cleared to taxi
  Series of red flashes	Aerodrome unsafe, do not land	Taxi clear of landing area in use
  Flashing white	Land at this aerodrome and proceed to apron	Return to starting point on aerodrome
  Alternating red and green flashes	Danger, be on the alert	Danger, be on the alert