Books on the topic of Aircraft Maintenance can be found in the TL671 call number range of the library stacks.
Remember you might have to look at other areas depending on your topic (example, if you topic is about education in this subject area then you might look in the education/teaching section).
Find Books using Library Catalog, the catalog under the left menu, and the catalog link on the top of the page. (Login using your TTC login.)
Use the Library's ebook databases to search for available online books.