What is wrong with the Boeing 737 MAX aircraft?
Boeing took a perfectly good plane and turned it into a flying dog box!
May 11, 2019 - by Simon Gunson for quora.com
In short, Boeing took a perfectly good plane and turned it into a flying dog box! 737MAX is an out growth from the Next Generation 737NG series, in which the main feature is the addition of new super fuel efficient LEAP-1B engines.
Problems Began when Boeing fitted a new LEAP engine to an old airframe design.
The latest Pratt&Whitney; PW110G engines -an engine option for the rival A320NEO, features a gearbox to change pitch in the Low Pressure Fan much like changing gear in a car.
LEAP engines on the 737MAX also change fan blade pitch but without a gearbox by exploiting materials technology in twisting fan blades. As blades heat from air friction fan blades on the LEAP engines un-twist. Both the LEAP engines (also used on A320) and the PW1100G series engines deliver about 15% fuel savings over previous engines used by earlier A320 and B737NG aircraft.
Older 737NG aircraft could not compete with fuel economy of the A320NEO and Boeing suddenly woke up to this fact in 2010 which is why the MAX was rushed to production on an old airframe between 2011–2017...