Windy,

The 707 & 727 F/D's sadly do not really work.
This is a know problem and we are hoping that some day the problem will be corrected. Don't hold your breath. 

As for the hydraulics, the 707's I flew had all the controls on the lower F/O's panel. The handbook shows switches on the F/E panel which are not modeled in the CS plane.

Pretty simple system since you had a utility system to run the gear, flaps and spoilers and a separate rudder system. Ailerons and elevator were not powered.

Lou

If we dream on a bit, I could imagine some addon which enables all sort of maintenance tasks for the 707. You know, in the way some companies offer it for the small GA planes (Piper Cub!). So you could walk around the plane, open certain departments, check the levels and for foreign object damage, pull the CBs, adjust things.

Should come together with a HUGE book on the system details. 

But it would be cool, say it!  Educational addon, eh?

Windy, when speaking about a separate soft which accesses the FSX ingame failure 'generator' or just fails certain systems, I think there is such a thing. At least partially and perhaps in a setup together with a career mode of some kind.

Now those things access what FSX offers, so it won't go as deep as a light bulb or certain CBs but it'll stay at e.g. engine 1 failure or a non working gear. Now some addons allow a sort of instructor station to access them, so one can really fail a subsystem or cause wonky freqs on the power generation. So this would go in the direction of my or our dream, a fully workable and maintainable 707. 

Now I don't know if there would be a market for something like that to be honest. Well, I never thought that there is a market for flight sim addons, just a few years back.