Which list contains valid MCC codes?

• A. E, G, H, Q, and X
• B. A, B, C, D
• C. E, F, G, H
• D. Q, R, S, T

Answer: (A)

MCC codes are a defined set of single-letter designators used to categorize maintenance actions, and only letters that are officially recognized as MCC codes are valid. The valid list contains letters that are all recognized MCC codes: E, G, H, Q, and X. That makes it a fully valid set for selecting MCC codes.

The other options include letters that are not defined MCC codes (for example, A, B, C, D in one set and F, and others in the remaining), so those lists aren’t completely valid. When choosing a list, you verify that every letter present is an official MCC code.