thomasdr72
Pre-takeoff checklist
Yes, sometimes the parts are special and made out of unobtanium. Other times, the guy who drew up the original factory drawing didn't do us the favor and list the COTS (Commercial Off-The Shelf) part numbers for the original source of the parts that were used. Ever notice things like the term "automotive" on older type cerificates? Bingo! I suspect it isn't as true for Part23 birds, but for the old CAR3 planes it's obvious...