High-intensity white flashing lights on obstructions other than supports for overhead transmission lines shall flash at __ flashes per minute.

Prepare for the AC2 Advancement Test with comprehensive materials. Review flashcards and multiple-choice questions with explanations and hints. Start your journey to success today!

High-intensity white flashing obstruction lights are used to warn pilots about tall structures at night. For obstructions other than the supports for overhead transmission lines, the standardized flashing rate is forty flashes per minute. This tempo strikes a balance between visibility and practicality—the light catches attention without becoming a confusing strobe. The other rates are not the specified requirement for this scenario, so forty flashes per minute is the correct standard.