Originally Posted by
atpcliff
It WAS incorporated from the start, IF you paid EXTRA for the system to be connected to both of the AOAs. The base package only included one AOA to be connected to the MCAS.
Originally Posted by
pangolin
Something doesn’t add up because airlines claim they didn’t know MCAS existed so why would they select 1 or 2 AOA sensors to be connected?
Yeah, not sure about exactly what the "option/s" entail/s...
Edit:
When it was rolled out, MCAS took readings from only one sensor on any given flight, leaving the system vulnerable to a single point of failure. One theory in the Lion Air crash is that MCAS was receiving faulty data from one of the sensors, prompting an unrecoverable nose dive.
In the software update that Boeing says is coming soon, MCAS will be modified to take readings from both sensors. If there is a meaningful disagreement between the readings, MCAS will be disabled.
https://www.seattletimes.com/busines...old-as-extras/
So, if the software wasn't written yet to incorporate reading from both sensors, then I don't see how it would have been an option...