LARGE with IF Statement?

Hi there!

I need to create a "Top 5" list based on two columns. The example is as attached (the real list is approx 22 000 lines):

I need to find the top 5 largest quantites (column A) for each flag catagory (column D) and include the part number and description. I have tried a pivot table and had some issues. Also tried a LARGE(IF...) type formula and still no luck. Does anyone have any ideas of what is the best way to do this??? I have a very short timeline and am struggling!

Thanks!