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Besides retraining, it seems that there must be upper-body strength tests that 737 MAX pilots will have to pass to ensure that they will be able to manually trim the stabilizer.

Are such tests part of flight crew physicals?

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Not in Europe at least. Here's the UK's version: https://www.caa.co.uk/Commercial-industry/Pilot-licences/App... (there's a broken link which should point to https://www.caa.co.uk/Aeromedical-Examiners/Medical-standard... )

Poe's law 'n all that -- are you serious? I mean, yes, I've seen the video, but presumably it won't be safe to require pilots to execute the manual trim, yeah? IMO either the design is unsafe and must change or there exists a way to safely fly without ever needing manual trim.

I'm serious. If the final backup system is to revert to mechanical cranks, pulleys, and cables to move the horizontal stabilizer, then the pilots have to be able to exert sufficient torque and power on the control wheels to do so.

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