The replacement of a damaged vertical stabilizer with a new identical stabilizer purchased from the aircraft manufacturer is considered a minor repair.

The replacement of a damaged vertical stabilizer with a new identical stabilizer purchased from the aircraft manufacturer is considered a minor repair.

• A. Major repair
• B. Cosmetic maintenance
• C. Routine service
• D. Minor repair

Answer: (D)

Understanding how repairs are categorized hinges on whether the work changes the aircraft’s ability to carry loads or its basic design. A minor repair covers work that restores the original configuration by replacing a failed component with a like-for-like unit using approved procedures, without altering load paths or structural capability. Replacing a damaged vertical stabilizer with a new identical stabilizer purchased from the manufacturer fits this, because you’re returning the aircraft to its original configuration using an approved, identical part. The procedure doesn’t involve redesign, reinforcement, or modification of the primary structure, nor does it change geometry or flight characteristics—only the failed part is swapped out and then the surfaces are inspected and tested to ensure airworthiness. If the replacement required a different part, alterations to the structure, or any reinforcement or redesign, it would move into a major repair category.

Understanding how repairs are categorized hinges on whether the work changes the aircraft’s ability to carry loads or its basic design. A minor repair covers work that restores the original configuration by replacing a failed component with a like-for-like unit using approved procedures, without altering load paths or structural capability.

Replacing a damaged vertical stabilizer with a new identical stabilizer purchased from the manufacturer fits this, because you’re returning the aircraft to its original configuration using an approved, identical part. The procedure doesn’t involve redesign, reinforcement, or modification of the primary structure, nor does it change geometry or flight characteristics—only the failed part is swapped out and then the surfaces are inspected and tested to ensure airworthiness.

If the replacement required a different part, alterations to the structure, or any reinforcement or redesign, it would move into a major repair category.