Try writing to the following:
Air Transport Association
Engineering, Maintenance and Materiel Division
1301 Pennsylvania Avenue, NW, Suite 1100
Washington, DC 20004-1707
The entire publication entitled "Manufacturer's Technical Data- ATA Specification 100" is approximateyl 3 1/2 inches thick and runs in the hundreds of dollars.
If all you need is the titles or headings of the chapters and sections, shoot me an e-mail and I'll see about getting one to you.