737 MAX MCAS
This was for the Ethiopia crash thread, now closed, so I'm posting it here:
Originally Posted by Gegenbeispiel
Quote:
Originally Posted by SLFstu
Hi
Thanks for noting why avionics logic can look/behave counter-intuitively.
I guess it was because in my previous job type there was the need to PRACTICALLY explain all observed actions.
Mind you, if Boeing ever did add some sort of MCAS ACTIVE annunciation then in the case I pointed out it would be a tad misleading if power to the trim motor is set to CUTOUT.
But in the overall scheme of things with this accident - 6 minutes until death - I was nitpicking about the minutest trivia.
Stay safe.
Stew
You're welcome, and thanks.
IMO, any MCAS activation is a very big deal. Boeing was wrong to try to hide MCAS from the crew.
The proper way, IMO, to annunciate MCAS ACTIVE would be as a master warning or master caution, with its own text on the warning panel. The signal for for that would be something like (((FCC1_SELECTED and FCC1_MCAS_ACTIVE) or (FCC2_SELECTED and FCC2_MCAS_ACTIVE)) and ELECTRIC_STAB_TRIM_ENABLED ) , probably implemented as hardware discrete logic. That would be an expensive modification. All the best. Arthur
PS do you mind if I put this msg exchange on the thread? I think I should.