Boeing's 737 Max is different from the predecessors by the System "MCAS". When Lion-Air-crash in October, it could have played a decisive role. Aviation journalist Spaeth a security system with risks.
by the end of last year was the System with the bulky name "Maneuvering Characteristics Augmentation System" ("MCAS") even many aviation experts, unknown. This changed abruptly after the 29. October, crashed as a two-month-old Boeing 737 Max 8 is only a few minutes after the Start in Jakarta - 189 people died.
Since then, discussions about the security and susceptibility to error of the control system, which was developed for the 737-Max series. A final investigation report on the accident yet, but investigators suspect that the System might have played a crucial role. Boeing has announced for the coming weeks, a Software Update. Whether the crash of the Ethiopian Airlines has to do the machine in accordance with the System, is not known. Aviation journalist Andreas Spaeth speaks in the Interview about the function and risks.
tagesschau.de: Why Boeing has the "MCAS" for the Max series introduced at all?
Andreas Spaeth: you have to go back a little: The Boeing 737 it has been around for 50 years, the Max series came out but it was only two years ago. The background is that the Airlines wanted a more modern, more economical aircraft. A completely new aircraft would have not been worth it for Boeing, because two-digit-billion amounts had to be invested. So you have redesigned the old 737 - and that seems to take revenge now.
tagesschau.de: What was the Problem?
There is now a new Generation of engines, they are more efficient and have a larger diameter than the old ones. And for the earlier 737 was not created, actually, because the wings hang pretty close to the ground. It is thus no longer possible to hang the engines as before, just under the wings. You had to attach for the Max. the engines much further forward, and that requires massive Umkonstruktionen. So, for example, the nose gear had to be 20 inches extended.
In result, has changed the entire aerodynamics of the aircraft. A plane has to be in its aerodynamics and its centre of gravity exactly balanced, and were for the 737 Max Changes necessary. The negative consequences of the changes in the aerodynamics, it was built in the "MCAS".