Originally Posted by
ecto1
Great video, although before you spread it, I think it has some important details wrong:
- He thinks the problem MCAS try to solve is that thrust produces pitch-up moment. It's not, it is a surface (nacelles) which produces no lift at low AOA but some at high AOA. If say surface is not at the center of gravity longitudinally, say it's forward from it, this added lift will create a nose up moment that wasn't there at low AOA, and as long as it's not "compensated" by anything extra in the rear will reduce the pull force at the controls. Additionally, in frontal view, the nacelles drag COP also raises so that reduces the nose down moment induced by it (more than with the previous engines position).
- He said MCAS advances throttles to full.
Yes, I picked up those points immediately (thanks to this forum). YouTube is aimed at a broad audience, and subtle technical details may be hard to convey (not sure he is aware of the difference).
The key points I noted were human factors, the ability of the jump seater to objectively diagnose, and other insights. Many people on this forum still cannot accept that those pilots could not see the 'obvious' solution.
I posted the link in this specific thread, because a search showed a post of one of his previous videos earlier in the thread.