U.S. Code of Federal Regulations
Regulations most recently checked for updates: Jan 21, 2026
When more than one obstruction light is required by this part to mark a structure, all such lights shall be operated to flash in unison.
Regulations most recently checked for updates: Jan 21, 2026
When more than one obstruction light is required by this part to mark a structure, all such lights shall be operated to flash in unison.