Which statement is true about the required maintenance on CAT 4 items?

• A. No approval is needed for any intervention.
• B. Approval from the FSR/QAR is required before surface prep and touch up.
• C. Surface prep and touch up is optional.
• D. A full teardown is required before any touch-up.

Answer: (B)

A CAT 4 item requires a check and authorization step before any surface restoration work. Specifically, you must obtain approval from the Field Service Representative (FSR) or Quality Assurance Representative (QAR) before doing surface prep and touch-up. This is to ensure the repair is within the approved methods, the corrosion assessment is valid, and the correct materials and procedures are used. It also keeps proper documentation and confirms the work won’t mask a more serious underlying issue.

Other approaches—bypassing approval, making surface prep optional, or requiring a full teardown before touch-up—don’t align with the controlled process for CAT 4 items, where QA oversight and formal authorization govern these corrective actions.