IMHO you should be able to recall everything you might need to know immediately. eg. Speeds for wipers and gear etc.
Anything that is not urgent (can be thought about in a non dynamic environment - e.g. time between manual engine starts) should at least be able to be located promptly in the manuals. Even the obscure ones should be able to be located promptly. Especially with digital search functions these days.
People should also understand how to properly use the Boolean search functionality in the Flysmart app, and manual selection to narrow down search strings.