If I remember correctly, you didn't want to take a 727 with #3 generator inop because IF you lost #1 and #2, you wouldn't be able to power the rudder and control would become questionable. Actually, as the sim instructor demo's, impossible. I still can picture looking up from the floor (cranking the mains down, figuring, at least, the mains should be down) as we scooted by the Marriott off of 9L at KMIA. 27 years ago.
GF
411A, The Galaxy was really a wonder also, if only it had decent maintenance support.