3 ms·
What's worse is that the upcoming MCAS fix is not a fix. If one sensor is misbehaving (seemingly more common than desirable) then pitch-up will not be automatic
by mzs 7y ago
What's worse is that the upcoming MCAS fix is not a fix. If one sensor is misbehaving (seemingly more common than desirable) then pitch-up will not be automatically corrected:
"Boeing specifically highlighted in presentation documents the new MCAS compares inputs from two angle of attack (AOA) sensors as opposed to a single sensor in the original, flawed, design. MCAS will only activate if data from both sensors agree the AOA is too high. MCAS will activate only once per high AOA event. Pilots will be able to override it and the system will not activate automatically a second time. In the original design, the system reactivated over and over. The presentation reiterates the crew can deactivate MCAS by turning off the automatic trim system and manually turning the trim wheel."
https://imgur.com/a/H5milYP https://imgur.com/a/H5milYP
- rtkwe 7y agoHmm I wonder if that will be accepted. The whole point of MCAS was to avoid getting assigned a new type which would require airlines to pay to have pilots certified on the new type, with MCAS only working and only fixing the maneuvering differences when both AOA sensors agree (and Boeing not making AOA a critical system with redundancy) it will be interesting to see if this still gets the benefit of sharing type rating with the existing 737s. I imagine the FAA is going to be reluctant to just wave them through this time and I wonder if one activation is enough to actually correct the pitch up.
- donmcronald 7y agoYeah. I don’t get it. If MCAS changes the way the plane flies, and MCAS can be switched off, don’t the pilots need to know how to fly the plane without MCAS? Then why even have MCAS?