Originally Posted by
spornrad
Finding F3.5-C The JATR team considers that the STS/MCAS and EFS functions could be considered as stall identification systems or stall protection systems, depending on the natural (unaugmented) stall characteristics of the aircraft. From its data review, the JATR team was unable to completely rule out the possibility that these augmentation systems function as a stall protection system.
(my emphasis)
In my words, it seems unclear to this day, whether the MAX is sufficiently aerodynamically stable in pitch or not. Whether the MAX requires a full blown stall envelope protection including all the mandatory redundancy, or not, may decide the fate of her certification.
Yes, this jumped out in the Reuters coverage, even before I saw the actual report. It's possible to imagine the FAA sliding past this question, under other circumstances, but with EASA, CAAC, etc. watching with suspicious eagle eyes?
From the report:
Recommendation R3.4:
The FAA should review the natural (bare airframe) stalling characteristics of the B737 MAX to determine if unsafe characteristics exist. If unsafe characteristics exist, the design of the speed trim system (STS)/MCAS/elevator feel shift (EFS) should be reviewed for acceptability.
Emphasis added.