4 ms·

This crash involves a 737 MAX - a very modern fully fly-by-wire aeroplane. I think the 777 was the last Boeing jet with mechanical backup flight controls. The

This crash involves a 737 MAX - a very modern fully fly-by-wire aeroplane. I think the 777 was the last Boeing jet with mechanical backup flight controls. The difference you're probably thinking of is the Boeing philosophy of ultimate pilot control vs the Airbus one of software restrictions. A pilot can fly a Boeing aircraft outside of its designed envelope, but an Airbus will restrict the inputs.

inferiorhuman 8y ago
> This doesn't sound right. Boeing planes are much less fly-by-wire than Airbus, and this is especially true for the older models such as the 757 in this crash. The plane that crashed was not a 757 it was a 737 MAX. > This crash involves a 737 MAX - a very modern fully fly-by-wire aeroplane. The 737 MAX is NOT a fully FBW airplane. The MAX does have a FBW spoiler which the previous 737s (Jurassic, Classic, NG) lack. > The difference you're probably thinking of is the Boeing philosophy of ultimate pilot control vs the Airbus one of software restrictions. A pilot can fly a Boeing aircraft outside of its designed envelope, but an Airbus will restrict the inputs. That's not entirely true, all 737s will put additional pressure on the yoke when a stall is detected. You can fly a 737 into a stall, but with quite a bit of effort. Similarly you can fly a modern Airbus into a stall provided you're in one of the degraded "laws". Air France pilots did just that with an A330. Where the MAX differs from other 737s is that when a stall is detected it will trim the stabilizer -- even worse when the computer predicts a stall the 737 may end up trimming the stabilizer to the point that you cannot overcome it with the elevator. On a 737 the elevators respond quickly while the trim adjustments are much, much slower. If you're 5,000 ft in the air and Boeing decides to trim the stabilizer full down you may already crash by the time you can re-trim the plane and regain control. Previous 737s did NOT do this. I believe that LOT specifically emphasizes this in their MAX training, unsure if Lion Air did/does.
- FabHK 8y ago
  inferiorhuman appears to know what he is talking about; you can safely ignore the comments preceding his (except the useful alternative link).
Serow225 8y ago
737MAX is not fully FBW. Trim is one example...

inferiorhuman 8y ago

> This doesn't sound right. Boeing planes are much less fly-by-wire than Airbus, and this is especially true for the older models such as the 757 in this crash. The plane that crashed was not a 757 it was a 737 MAX. > This crash involves a 737 MAX - a very modern fully fly-by-wire aeroplane. The 737 MAX is NOT a fully FBW airplane. The MAX does have a FBW spoiler which the previous 737s (Jurassic, Classic, NG) lack. > The difference you're probably thinking of is the Boeing philosophy of ultimate pilot control vs the Airbus one of software restrictions. A pilot can fly a Boeing aircraft outside of its designed envelope, but an Airbus will restrict the inputs. That's not entirely true, all 737s will put additional pressure on the yoke when a stall is detected. You can fly a 737 into a stall, but with quite a bit of effort. Similarly you can fly a modern Airbus into a stall provided you're in one of the degraded "laws". Air France pilots did just that with an A330. Where the MAX differs from other 737s is that when a stall is detected it will trim the stabilizer -- even worse when the computer predicts a stall the 737 may end up trimming the stabilizer to the point that you cannot overcome it with the elevator. On a 737 the elevators respond quickly while the trim adjustments are much, much slower. If you're 5,000 ft in the air and Boeing decides to trim the stabilizer full down you may already crash by the time you can re-trim the plane and regain control. Previous 737s did NOT do this. I believe that LOT specifically emphasizes this in their MAX training, unsure if Lion Air did/does.

FabHK 8y ago
inferiorhuman appears to know what he is talking about; you can safely ignore the comments preceding his (except the useful alternative link).

Serow225 8y ago

737MAX is not fully FBW. Trim is one example...