Which statement correctly describes the relationship between MIL-C-85285 and exterior coatings?

• A. MIL-C-85285 designates the standard exterior protective coating for aircraft surfaces
• B. MIL-C-85285 designates a primer for steel structures
• C. MIL-C-85285 designates a sealant for doors
• D. MIL-C-85285 designates a corrosion inhibitor for avionics

Answer: (A)

The main idea here is that MIL-C-85285 is a standard for the exterior corrosion-protective coating used on aircraft surfaces. This specification defines what the exterior coating should be, including performance criteria and how it should be applied, so that aircraft surfaces have reliable protection against environmental factors like humidity, salt spray, and temperature changes. It is specifically about the exterior coating system, not primers, sealants, or inhibitors used for other areas or components. The other options describe roles that belong to different specifications or uses, not the exterior protective coating standard defined by MIL-C-85285.