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Originally Posted by
Lost in Saigon 
The consensus is WRONG. Boeing clearly states that electric trim will STOP and even REVERSE unwanted MCAS operation.
Originally Posted by
wheelsright
Unfortunately, Boeing cannot be relied on as providing full and accurate information. The investigation and further legal actions will have to resolve how the systems actually works. There may be an assumption that electric trim input will override MCAS authority but it is not entirely clear how the system operates with conflicting demands. How the authority is resolved during conflict will have to be resolved fully. There are software, electrical, mechanical and aerodynamic elements to the investigation of the trim system.
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Alll 3 of the FDR traces clearly show MCAS kicking in ~5 seconds after the last manual electric trim. The ET trace also shows MCAS stopped in it's second run by pilot trim at 05:40:27. This is exactly as Boeing describes it.
On a separate note, it is only the manual (wheel) trim that is suspected of being inoperable with high aero loads. (not just at >VMO).
The electric trim will work, and even if the motor stalled the inputs would still show on the FDR, in the same way that the MCAS input in ET at 05:40:15 had no effect on trim due to stab trim cutout.
The pilots electric trim inputs (if any) would not show due to the wiring of the cutout switches that remove 28Vdc to them.