There is an error or overlooked function of the 767. As soem may know, at least Lou and I do, if a 767 loses all electric power drives and the center hydrualic system, the gear CANNOT be deployed, even by the RAT. I tried this just today, and even with all hydraluics failed and no engines gear still deployed. This disappointed me, and I hope Captain Sim updates this for their next 767 update.