fdr said
What is described is also a design that is not compliant with the requirements of Part 25. There is no justification that can be made that an aircraft needs to be handled in such a manner with the failure of a system that is both possible and part of the design requirement to have no adverse effects on failure... Forget about MCAS, how on earth is the procedure in the FCTM reasonable or acceptable. This is not an acro, it is a transport category aircraft.
Forget about MCAS, how on earth is the procedure in the FCTM reasonable or acceptable.
The design defect of immovable manual trim wheel in the pitch control system under some conditions was obviously acceptable to the FAA 50 years ago to allow certification of the B737 aircraft type.
Grandfather rights on existing certification of the B737 aircraft type has somehow allowed this defect in the flight control system to continue to exist in the modern era.
The high authority automatic MCAS system combined with the low authority manual electric trim system for the pilot to counteract the MCAS, has now shown up this "hidden" design defect in a most dreadful way.
The design defect of the immovable trim at high aerodynamic loads has been festering for 50 years awaiting a system that would reveal it to be a fatal design flaw.