Originally Posted by
Pugilistic Animus
No RAT/PTU/HDG? Just curious
No RAT on the 737 (disclaimer, not completely sure about the MAX) - you don't need hydraulics to fly the 737 (although it sure helps). Battery is supposed to supply critical flight instruments for at least 30 minutes after a complete loss of electrical generation. I don't think you can enter an ETOPS sector with a failed engine driven generator (I stand to be corrected here - I'm not that familiar with the 737 limitations).
Note that this arrangement was pretty common on the earlier generation of jet aircraft - even the 747 didn't have a RAT prior to the 747-8 since in an all engine out, the windmilling engines would provide enough hydraulic pressure to control the aircraft (granted it takes more failures on a 747 to get there).