Paragraph 42 Lights and pyrotechnic signals for control of aerodrome traffic

Each signal described in the first column of Table A, when directed from an aerodrome to an aircraft or to a vehicle, or from an aircraft, shall have the meanings respectively appearing in the second, third and fourth columns of that Table opposite the description of the signal.

Table A

Meaning of Lights and Pyrotechnic Signals

	From an aerodrome
Characteristic and colour of light or pyrotechnic	to an aircraft in flight	to an aircraft or vehicle on the aerodrome	From an aircraft in flight to an aerodrome
(a) Continuous red light	Give way to other aircraft and continue circling.	Stop	—
(b) Red pyrotechnic light, or red flare	Do not land; wait for permission.	—	Immediate assistance is requested.
(c) Red flashes	Do not land; aerodrome not available for landing.	Move clear of landing area.	—
(d) Green flashes	Return to aerodrome; wait for permission to land.	To an aircraft: You may move on the manoeuvring area and apron;	—
		To a vehicle: You may move on the manoeuvring area.
(e) Continuous green light	You may land.	You may take off (not applicable to a vehicle).	—
(f) Continuous green light, or green flashes, or green pyrotechnic light	—	—	By night: May I land? By day: May I land in direction different from that indicated by landing T?
(g) White flashes	Land at this aero-drome after receiving continuous green light, and then, after receiving green flashes, proceed to the apron.	Return to starting point on the aerodrome.	I am compelled to land.
(h) White pyrotechnic lights Switching on and off the navigation lights Switching on and off the landing lights	—	—	I am compelled to land.