That was cringeworthy at best and at worst took up frequency bandwidth when the emergency aircraft might have a need to communicate with ATC. I’m sure lots of people on frequency fly or have flown the 170/190 series. Should they form an ad hoc committee to talk the guys down? There was probably about 10 A320s on freq then too, if one of them had an emergency, should all the other 320 pilots chime in? It’s one of the stupidest things I’ve heard a professional pilot do on the radio—besides all the guard crap.
So all control surfaces except most...
I know that you know, but for the kids following along at home it's a backup for the FBW. The Airbus has the same thing, but it's the rudder and Jack screw that are directly connected to the controls.I mean, just because the method of actuation is a jackscrew doesn’t mean it’s not fly by wire.
I believe the wording in the AOM can be paraphrased as follows: “Potentially unrecoverable.” As I recall it, the jackscrew (@jtrain609 is correct) can move the stabilizer into a position that cannot be overcome by elevator authority alone.Ive got some brain fog on it, but I do remember a pitch trim runaway can be a handful if not caught quickly, which likely wouldnt be when youre flying along on a normal day.
Reminds me of the notes on some approach plates in Alaska: "Go around improbable"