- Joined
- Jun 24, 2008
- Posts
- 4,399
- Qantas
- Gold
- Virgin
- Red
& if the software fix is sorted sooner, max 8s could be flying much sooner. It must be costing Boeing billions ?
Not only Boeing, the whole US economy.
& if the software fix is sorted sooner, max 8s could be flying much sooner. It must be costing Boeing billions ?
It seems they (Boeing) barely understood any failure modes. I would have thought it was obvious to test a system (MCAS) for a situation when its key input (AOA vane or sensor) might fail. Maybe they did, and declared the test as passed after a single simple recovery without seeing it through to the bitter end.This event really does show that a failure to understand all possible failure modes and their outcomes is a dangerous situation.
Indeed, with hind-sight it is very obvious now. Unfortunately those involved with the design, development, testing, analyses and certification seemed to have missed the devastating implications of what we now see as an obvious, to-be-expected, and somewhat predictable failure mode. And this leaves me wondering what other situations have not been predicted, anticipated, tested, properly evaluated? But this also highlights the way the aircraft industry improves safety as the causes of accidents and incidents are thoroughly investigated and changes implemented to minimise the risk of future similar events. The fact that this was the second accident with the same causal effects is disappointing. In this Ethiopian case, it appears the holes in the Swiss cheese aligned in a slight different manner, resulting in MCAS events at a much lower altitude, contributing to the outcome as the pilots had much less time/space to remedy the inappropriate control inputs from the automation systems.It seems they (Boeing) barely understood any failure modes. I would have thought it was obvious to test a system (MCAS) for a situation when its key input (AOA vane or sensor) might fail. Maybe they did, and declared the test as passed after a single simple recovery without seeing it through to the bitter end.
AFF Supporters can remove this and all advertisements
Coming from the FAA? "Political pressure", that's what it most likely meansFAA declares MCAS V2 to be “operationally suitable”. I’m not sure what that means.
But this also highlights the way the aircraft industry improves safety as the causes of accidents and incidents are thoroughly investigated and changes implemented to minimise the risk of future similar events.
FAA declares MCAS V2 to be “operationally suitable”. I’m not sure what that means.
I read it means that they have decided the simulator training is not required.
Call me an idiot if you like, but couldn't this all have been solved better by :-
1. Informing pilots of the performance changes and MCAS protections in the new MAX variant
2. Only triggering MCAS when BOTH AoA sensors agree there is a danger of stalling
Of course ideally there would have been updates of and compulsory certification on simulators, but the primary need is to let the pilots have the knowledge needed to let them fly the aircraft.
The upshot, is that this system has almost certainly killed more people than it ever might have saved, if it had actually worked.
Not necessarily. We don't really know how many lives MCAS has saved / will save - that is probably the most interesting/worrying thing. To what extent is it needed to keep the MAX in the air?The upshot, is that this system has almost certainly killed more people than it ever might have saved, if it had actually worked.
I read it means that they have decided the simulator training is not required.
Can the current MAX simulators simulate MCAS V1 or V2?
MCAS or runaway trim?Of course. The NG can even simulate it.
It’s needed for some regulatory requirements regarding the stall behaviour. It may well be that these have more to do with the idea that it’s just the same as all other 737s as a real instability that needs to be protected.Not necessarily. We don't really know how many lives MCAS has saved / will save - that is probably the most interesting/worrying thing. To what extent is it needed to keep the MAX in the air?
You alluded to this earlier in your post:
"I would not be surprised if some of the foreign authorities refuse to certify the aircraft now....not because of MCAS, but because it is needed."