U.S. Code of Federal Regulations

Regulations most recently checked for updates: Jan 21, 2026

All TitlesTitle 33Chapter IPart 67-AIDSSubpart 67.20 - Subpart 67.20-Class “A” Requirements
§ 67.20-1 - Class “A” structures.
§ 67.20-5 - Obstruction lights.
§ 67.20-10 - Sound signal.
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