AC-43.13-1A has been cancelled effective September 8, 1998. When completing Major Alternation and Repair forms that make reference to AC 43.13-1A, the references must be made to the new, current advisory circular. The AC-43-13-1B has been extensively rewritten and includes expanded information in most topics including: Non-Destructive Inspection (NDI) techniques, Aircraft Corrosion Control, Repair of fiberglass and plastic laminate structures. The AC-43.13-1B is conveniently bound together with the AC 43.13-2A Acceptable Methods, Techniques and Practices-Aircraft Alterations manual. The textbook features 736 pages.