R stamp (Repair and Alteration Certification)

The R stamp, or Repair and Alteration Certification, is an official mark used in the aviation industry to verify that repairs or modifications to aircraft structures and components meet regulatory standards. Certified by authorized engineers or organizations, it ensures the work is properly inspected, safe, and compliant with aviation safety regulations. Essentially, the R stamp provides assurance that the repair or alteration has been properly evaluated and approved, maintaining the aircraft's safety and airworthiness.