What best describes preventive maintenance as described in 14 CFR part 43, appendix A?

• A. Major repairs only by certificated mechanics.
• B. Simple or minor preservative operations and the replacement of small standard parts not involving complex assembly operation.
• C. Any maintenance including disassembly.
• D. Only by air carrier maintenance.

Answer: (B)

Preventive maintenance is defined as simple or minor preservation operations and the replacement of small standard parts not involving complex assembly operations. This means tasks that keep the aircraft in a safe, serviceable condition without requiring major disassembly, overhaul, or complex engineering work. It can include routine, straightforward upkeep and the substitution of small standard parts that don’t involve assembling major components.

That’s why this description is the best fit: it captures the essence of preventive maintenance as light, routine work, not the extensive repairs or disassembly that would fall under more substantial maintenance. The other options describe activities that are broader or more involved (major repairs, disassembly, or restricted to certain operators) and don’t match the defined scope.