When entering information into the CDU, what is the rule regarding box data and dashes?

• A. Box data is mandatory and dashes are not required; if information is known then add data
• B. Dashes are required and box data is optional
• C. Box data is optional and dashes are mandatory
• D. Data is optional and not required

Answer: (A)

When entering information into the CDU, you provide actual values in the data boxes whenever that information exists. Dashes aren’t required as placeholder entries; if the data is known, you enter it. This approach keeps inputs explicit and unambiguous, which is important for how the CDU uses the data for navigation and performance calculations. Using dashes or leaving data optional could lead to ambiguity or reliance on defaults, which is not the intended practice.