Hi all.I remember when I've red PMDG 737-600/700 manual that this plane has two usable FMC . One is standard and open with normal commands "F" on the panel or with keybord shift-4. How about second FMC, how can I bring it up and connect to autopilot LNAV/VNAV ? I'm not able to find out the second FMC description on manual.Thanks allDome

From FS Menu: views -> panel -> seconday FMC or something like that.

Yep!Or another possibility is:go into VC mode zoom onto the FMCs and programm them right there. Both 600/700 FMCs are fully clickable in VC mode, even if you have not upgraded to the B800/900 yet.Wolfgang

Thanks to all, I see the story in VC. But a question remains : how the MCP chooses to follow FMC 1 or 2 ? I.e.: if I program a route on FMC 1 when click LNAV it normally follow FMC 1 route. I suppose that I must leave blank from/to airoport of FMC1, to let FMC 2 do the dirty job. I'll try.Thanks Dome

>Thanks to all, I see the story in VC. >But a question remains : how the MCP chooses to follow FMC 1>or 2 ? Just like in the real bird, the 2 FMCs (on bigger airplanes like the 777 and 747 there are even 3) are connected to the same FMS, and are for comfot of the crew only:-eighter one of the crew member can enter data without overreaching with his arms with the risk of moving the throttles, flaps, speedbrakes, fuel cutoff levers, etc-it gives the possibility of contemporarily showing 2 info pagesHope this helps

Claudio, you are mixing up a few things here (again)The FMS is the combination of:FMC andCDU.The FMC is an ugly grey box in the avionics compartment. It doesn't have any buttons (well not any the flight crew uses) or indications. Its only a computer (that only computes stuff).The CDU is the centralized display unit, basically the monitor and keyboard in one piece of hardware.Again, the combination of these two makes up the system called FMS.Now then, the number of FMC's varies from company to company to aircraft. Most, if not all, aircraft have two CDU's.Some are only equipped with one FMC. Should it fail, you are left with VOR nav on the 737.Most larger aircraft are equipped with two FMC's and three CDU's. The third CDU functions as a backup should another CDU fail. It can also be used to access different aircraft systems such as the ACARS but then its called a MCDU (multipurpose CDU)I'm not sure of this (not a real 737 expert), but I assume each FCC (flight control computer) accesses its respective FMC. Thus, with AP B engaged, the right FMC will be master and the other one will check its output. With the left FCC master, its the other way around.Regards,Mark

>Claudio, you are mixing up a few things here (again)Luckily i am not mixing anything :)I am just using the therminology used by the original poster, to let him comprehend easier :)>I'm not sure of this (not a real 737 expert), but I assume>each FCC (flight control computer) accesses its respective>FMC. Thus, with AP B engaged, the right FMC will be master and>the other one will check its output. With the left FCC master,>its the other way around.Correct :)