Here you can download free Aviation Reference books, Manuals PDF files and Aviation Guides. Kindly inform me if there is any broken links here.
Advanced Avionics Handbook (FAA-H-8083-6).pdf (115 pages pdf file, 26.5 MB).
Aircraft Weight and Balance Handbook (FAA-H-8083-1A).pdf (97 pages pdf file, 12.5 MB).
Rotorcraft Flying Handbook 2000.pdf (207 pages pdf file, 16 MB).
Human factors for AMEs