Re-covering a fabric aircraft is considered what type of maintenance?

Re-covering a fabric aircraft is classified as a major repair or alteration because it involves substantial work that affects the aircraft's structure and performance. This process typically requires removing the existing fabric covering and replacing it with new material, which alters the original condition of the aircraft. Major repairs are defined as those that, if not performed, would affect the overall safety and airworthiness of the aircraft.

Aircraft maintenance is categorized into different levels, and major repairs necessitate specific approvals, adherence to regulatory standards, and possibly the endorsement of qualified personnel or repair stations. This distinguishes it from routine inspections, minor adjustments, or annual maintenance, which do not encompass the significant changes and safety considerations involved in substantial fabric replacement.