The FAA's AC43.13 provides a wealth of information pertaining to the inspection and general maintenance of airplanes. In it, you'll find charts and tables, AN identification and marking conventions; and most importantly, maintenance standards. Compliance with the standards set forth in AC43.13 is not optional - it's mandatory. We strongly recommend that you get a copy of this essential book and keep it handy whenever you do maintenance or inspections. 4 lbs (2Kg) shipping weight.