Which timing statement is correct for surface prep and touch up on a CAT 4 item?

• A. It can be performed without approval.
• B. It should be documented after completion.
• C. It does not require any documentation.
• D. It requires approval from FSR/QAR.

Answer: (D)

Surface prep and touch up on a CAT 4 item involve altering a surface coating, which can impact corrosion protection and the item’s reliability. Because of that, this work must be controlled and traceable. The correct approach is to obtain approval from the Field Service Representative (FSR) or the Quality Assurance Representative (QAR) before doing the work. Their sign-off confirms the method, materials, and scope are within approved procedures and ensures the action is properly documented in the maintenance records. Performing the work without this approval or skipping documentation would bypass essential QA oversight and traceability. After completion, documentation is still important, but the key timing requirement is pre-approval from FSR/QAR to authorize the touch-up.