ArviLaanemets, thank you for your assistance!

This solution is exactly how I would set this up in MSAccess, a data entry form with each entry specified for Task Card#, MOD, and Aircraft.

Would this work for 9 different sheets (tabs)? Each aircraft has its own unique features and quirks, so not every Task Card is released to every aircraft.

Also, there are numerous groups that reference and/or mine data from this workbook and the 'full sheet by aircraft' is their preferred view.

What do you think?