OBSTRUCTION LIGHTING FOR STACK
These recommendations are based on Chapter 6 of Annex 14 of ICAO (International Civil Aviation Organization latest edition)
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 & 4 |
| ICAO dual color medium intensity type A/B and L-865/L-864 kit including 3 lights and cabinets at top and bottom | OFI120-RW-48-240-U |
| 2 |
| Low intensity type B NAVILITE (3 units) | NAVILITE-IR-FAA-120-240V |
| 3 |
| Photocell (day/night switch) | 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 (3 units) |
| 2 |
| Low intensity type B (3 units) |
| 3 |
| Controller |
| 4 |
| Photocell (night only operation) |
Chimney higher than 150 meters high
Below the top and around the perimeter of the chimney, high-intensity type A obstruction lights shall be installed, with levels spaced at a maximum interval of 105m.
The number of lights per level depends on the diameter of the chimney:
- 3 lights if the diameter is less than or equal to 6m
- 4 lights if the diameter is between 6m and 30m
- 6 lights if the diameter is between 30m and 60m
- 8 lights if the diameter is greater than 60m
High intensity obstruction lights are synchronized white flashing lights operating permanently with three luminous intensity levels varying according to: Day: 200,000 candelas Twilight: 20,000 candelas Night: 2,000 candelas
At the base, a controller equipped with a day/twilight/night photocell ensures the automatic switching of luminous intensity and the monitoring of the beacons.
| Description | Part number | ||
|---|---|---|---|
| At each level of the chimney | |||
|
| high intensity type A obstruction lights | OFH-120-RW-240 | |
| At the bottom of the chimney | |||
|
| Controller | OFH-CTR-CAN | |
|
| Photocell for day/twilight/night change | PHOTOCELL DC |
