4 ms·
The other part of Boeings fix is to prevent MCAS from being reactivated repeatedly. If I remember correctly they are not allowing it to reactivate until the AoA
by VBprogrammer 7y ago
The other part of Boeings fix is to prevent MCAS from being reactivated repeatedly. If I remember correctly they are not allowing it to reactivate until the AoA returns to normal.
I'm hopeful that they have analysed what happens if the AoA returns more or less random data.
- zepearl 7y ago> ...they are not allowing it to reactivate until the AoA returns to normal. Puah, but what is "normal"? This is probably kind of tricky to define if you cannot potentially rely on the sensor(s). Additionally I understand that the auto-trim of MCAS was created to actually react to "abnormal" situations (nose too high), which brings us here into a conflict :)
- VBprogrammer 7y agoBy normal I mean below its threshold for activation. According to Boeing this depends on speed and attitude. Of course this leaves the problem of what happens if the sensor data was wrong but fluctuating wildly. Which is what I was getting at in the other paragraph. In both the Lion Air and the Ethiopian incident the sensor data went to some very high value and stayed fixed basically until the aircraft hit the ground so perhaps they know that is the only failure mode or maybe they are accounting for other failures but don't feel the need to expand upon that in public.
- rasz 7y agoGood thing its easy to manually trim then https://vimeo.com/329558134 https://vimeo.com/329558134