5 ms·
Yeah. Problem is that it is pretty hard to fix such system problem: - Plane was bad, so they band-aided it in factory, but band-aid keeps falling off sometimes
by jiri 6y ago
Yeah. Problem is that it is pretty hard to fix such system problem:
- Plane was bad, so they band-aided it in factory, but band-aid keeps falling off sometimes. So planes stay grounded.
- Sure, they can make better band-aid but everyone knows planes are bad designed so it won't help much (even if super safe band-aid)
- Correct way is to rebuild the plane to make it good, but this is/was out of the table - it was already way too expensive in the first place.
And here we are.
- frombody 6y agoThe plane was designed with dual AoA sensors from the beginning. Boeing management made a decision to sell dual sensors as an option package, cutting the base model down to one single AoA sensor per MCAS. (there are two MCAS systems to provide redundancy) It was already built adequately, the decision to cut corners on safety to try and leverage a small profit was the problem. Dual AoA sensors as part of the standard option package and providing adequate training to pilots would have prevented all of this.
- FabHK 6y agoSource? My understanding is that all MAX have dual AoA, and all MAX used only one of them for MCAS.
- frombody 6y agoThat's correct. One sensor per MCAS means that only one sensor is used at a time, so if it is installed incorrectly or is faulty. The faulty data is fed into the MCAS. This is what caused the crashes. The more expensive option packages included dual-AoA sensors. Two AoA sensors per MCAS, and then an AoA disagree alarm that would alert the pilot that the AoA sensors are not in agreement.
- labawi 6y agoAFAIU, there are only two AoA sensor total in both cases. But you only get an AoA disagree alert, if purchase an AoA indicator. https://boeing.mediaroom.com/news-releases-statements?item=130431 https://boeing.mediaroom.com/news-releases-statements?item=1...
- frombody 6y agoIf you purchased the option package, it included an additional AoA vane (sensor). The AoA sensors on the standard model were meant to be redundant, not work together. Boeings fixes are making the sensors work together, while sacrificing what they originally designed as redundancy. Boeing is intentionally trying to suggest what you are which frames the problem as a mistake
- jiri 6y agoSo, everything would be solved (technically) if they can retrofit AoA disagree alarm? I am not sure what is the price tag for such operation but it has to be fortune otherwise they should included it in the first place.
- frombody 6y agoThis is what they are working on and what is referred to as the 'software fix' that was done. In reality these systems were meant to be redundant, and not linked together, so they're taking a sensor meant for a failover system and combining it into a single system to create this 'workaround'