re: nevermind

quote:

---

What are the built in redundant systems in a typical 737?

---

kind of a broad question but basically everything has at least one backup, in the case of the ones with a HUD and Cat III capable, three independent systems, the ones where I work do hand flown cat III approaches and landings, I think Alaskan does too

ETA: in the case of FAA Pt.121 certified two engine airliners the second engine is sort of a backup, as they are required to demonstrate that they can lose an engine on takeoff and complete the climb out profile on the remaining one