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Well, at least now I suppose the pilots are all very very aware of the quirks and details about this airplane. I suppose that even in a hypothetical case where

Well, at least now I suppose the pilots are all very very aware of the quirks and details about this airplane. I suppose that even in a hypothetical case where the airplanes were not modified at all we would be safer due to all the alertness about the quirky behavior. Does that make sense?

jlmorton 6y ago
We still don't have the exact CVR transcript from the Ethiopia Airways crash, but we have a description of it, and it appears the crew followed the runaway stabilizer checklist. They were certainly aware of the Lion Air crash. However, they could not get manual trim control to work. The manual trim operation requires a large amount of strength to operate when the stabilizer is loaded. It might be true that pilots would now be aware that they need to allow the stabilizer to be in an unloaded position before disabling the automatic trim. But that's a big if when the aircraft is only a few thousand feet off the ground. In other words, without any modifications, if MCAS were to erroneously operate during a takeoff, and the pilots had perfect information on what was happening, it still might be difficult to recover from it. They could probably wait for an MCAS cycle to complete, then disable the automatic trim. But there's only about 60 seconds to complete these actions.
- ApolloFortyNine 6y ago
  The pilots followed the checklist, but then reenabled the system very soon after. They left the engines at full power during the descent, which made it so they couldn't manually adjust the stabilizer (too strong aerodynamic forces). [1] Sorry about the wiki source, Google is only showing articles from the first 2 months after the accident. The lion air flight, the first one, is an example of the checklist working (and a large reason why the frame wasn't grounded after the first crash, there was evidence that it was avoidable from the day before) . [1] https://en.m.wikipedia.org/wiki/Ethiopian_Airlines_Flight_302 https://en.m.wikipedia.org/wiki/Ethiopian_Airlines_Flight_30...
deleted 6y ago
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jlmorton 6y ago

We still don't have the exact CVR transcript from the Ethiopia Airways crash, but we have a description of it, and it appears the crew followed the runaway stabilizer checklist. They were certainly aware of the Lion Air crash. However, they could not get manual trim control to work. The manual trim operation requires a large amount of strength to operate when the stabilizer is loaded. It might be true that pilots would now be aware that they need to allow the stabilizer to be in an unloaded position before disabling the automatic trim. But that's a big if when the aircraft is only a few thousand feet off the ground. In other words, without any modifications, if MCAS were to erroneously operate during a takeoff, and the pilots had perfect information on what was happening, it still might be difficult to recover from it. They could probably wait for an MCAS cycle to complete, then disable the automatic trim. But there's only about 60 seconds to complete these actions.

ApolloFortyNine 6y ago
The pilots followed the checklist, but then reenabled the system very soon after. They left the engines at full power during the descent, which made it so they couldn't manually adjust the stabilizer (too strong aerodynamic forces). [1] Sorry about the wiki source, Google is only showing articles from the first 2 months after the accident. The lion air flight, the first one, is an example of the checklist working (and a large reason why the frame wasn't grounded after the first crash, there was evidence that it was avoidable from the day before) . [1] https://en.m.wikipedia.org/wiki/Ethiopian_Airlines_Flight_302 https://en.m.wikipedia.org/wiki/Ethiopian_Airlines_Flight_30...

deleted 6y ago

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