To ensure legible copies and ample contrast, what type of writing instrument should be used when filling out the MF1M-10C?

Using a black-ink, fine ball-point pen when filling out the MF1M-10C ensures that the writing is clear and legible. Black ink provides the most contrast on standard white paper, making it easier to read for those reviewing or processing the document. The fine point of the pen also allows for more precise writing, which is particularly important in official documents where clarity is paramount.

In contrast, while blue and red inks can also be visible, they may not provide the same level of contrast as black, especially in certain lighting conditions. Additionally, some forms and institutional standards may specifically require black ink to maintain uniformity and legibility in official documentation. Since clarity and consistency are vital in aviation-related documentation, the choice of a black-ink, fine ball-point pen is the best suited for this task.