OBSTRUCTION LIGHTING FOR STACK

These recommendations are based on Chapter 6 of Annex 14 of ICAO (International Civil Aviation Organization latest edition)

The number of lights per level depends on diameter of the stack: As per FAA and ICAO aerodrome design manual, 3 lights may be required per level if the diameter is less than 6 meters, 4 lights if the diameter is between 6 and 30 meters, 6 lights if the diameter is between 30 and 60 meters and 8 lights if it is above 60 meters

Day and night operation (stack without red and white stripes)

45 to 105 meters high

Dual color medium intensity up to 6 meters below the top of the stack (red flashing at night, white flashing during daytime) Low intensity type B or FAA L-810(F) at mid level (red at night, off the day) Power cabinet and photocell

Position		Description	Model
1		Dual color medium intensity OBSTAFLASH120	OFP-120-RW-JB
2		Low intensity type B	NAVILITE-IR-FAA-120-240V
3		Stainless power supply	OFP-CAB-1B-RW-240
4		Photocell	PHOTOCELL DC

Night only operation (stack with red and white stripes)

up to 45 meters high

3 or more low intensity type B or FAA L-810 close to the top

45 to 105 meters high

3 or more red medium intensity up close to the top of the stack 3 or more low intensity type B or FAA L-810(F) at mid level

In case of medium intensity, control cabinet and photocell oriented to the North should be present at bottom

Position	Description	Model
1		Medium intensity type B
2		Low intensity type B
3		Controller
4		Photocell (night only operation)

Stack more than 150 meters high

3 or more high intensity type A obstruction lights every 105 meters maximum