During inspection, turbine engine components exposed to high temperatures may only be marked with such materials as allowed by the manufacturer. These materials may generally include

During inspection, turbine engine components exposed to high temperatures may only be marked with such materials as allowed by the manufacturer. These materials may generally include

• A. Layout Dye
• B. Commercial felt tip pen
• C. Chalk
• D. All of the above

Answer: (D)

Marking parts that are exposed to high temperatures must use materials that the manufacturer has approved, so the marks stay readable, don’t contaminate the part, and are appropriate for the service. In practice, you’ll see a range of approved options, including layout dye, which provides a clear, heat-tolerant line on metal surfaces; a commercially available felt-tip pen, which can be used if rated for high-temperature environments and chemical resistance; and chalk, which offers temporary markings that can be removed when no longer needed. Because manufacturers may authorize more than one type of marking material, all of these can be considered permissible depending on the component and the inspection procedure. So, all of the above reflects the typical range of materials you might encounter as approved for high-temperature markings.

Marking parts that are exposed to high temperatures must use materials that the manufacturer has approved, so the marks stay readable, don’t contaminate the part, and are appropriate for the service. In practice, you’ll see a range of approved options, including layout dye, which provides a clear, heat-tolerant line on metal surfaces; a commercially available felt-tip pen, which can be used if rated for high-temperature environments and chemical resistance; and chalk, which offers temporary markings that can be removed when no longer needed. Because manufacturers may authorize more than one type of marking material, all of these can be considered permissible depending on the component and the inspection procedure. So, all of the above reflects the typical range of materials you might encounter as approved for high-temperature markings.