AP stands for it's creator, Andre Puyans and utility, All Purpose. A real speed tie - only 3 materials if you don't count hook, thread and underbody (which is optional), I did this one full-figured to represent something like a western green drake; you can adjust the body mass index easily by adding/subtracting peacock herl.
hook - Dai Riki 060 #10
underbody - non-tox wire .025 (optional)
thread - Danville 6/0 dark brown
tail - pheasant tail fibers
rib - x-fine copper
abdomen/thorax - peacock herl
wing pad/legs - pheasant tail
Part 1
mash barb, wrap front of shank with non-tox; start thread, wrap underbody, taper front and back
tie in ribbing and wrap back to point above barb
measure a clump of pheasant tail fibers (hook gap past bend) and tie in; overwrap pheasant up to 60% mark and leave butts untrimmed
tie in peacock herl and wrap forward, untwisted (keeps it a bit slimmer than thorax and ribbing will protect it from fish's teeth) to 60% mark
counterwrap ribbing through abdomen; helicopter end and tie off