3-4-7. SEQUENCED FLASHING LIGHTS (SFL)
Operate Sequenced Flashing Lights:
NOTE: SFL are a component of the ALS and cannot be operated when the ALS is off.
- When the visibility is less than 3 miles and instrument approaches are being made to the runway served by the associated ALS.
- As requested by the pilot.
- As you deem necessary, if not contrary to pilot's request.