Salute Vess !
No misunderstanding , I really DID misunderstand! and I am very reasonably knowledgeable about all the thermodynamic relations.
My position is simple, and FC eng and others can refute:
The primary activation for the MCAS nose down trim is AoA
- MCAS inhibited with A/p engaged ( maybe)
- MCAS inhibited if flaps are not up ( demonstrated on two or more flights, .one fatal)
- MCAS can be defeated with a manual trim switch on the stick/yoke ( at least two flights in Indonesia, one fatal)
- The amount of trim rate applied by MCAS, and possibly the total amount has a mach function as has been explained by FCeng and other sources. [deleted using CONSO's explanation and review of books, heh heh] But mach is not what triggers MCAS nose down trim, it tailors it
That's my story, and I am sticking to it.
Gums sends...
Last edited by gums; 16th Mar 2019 at 03:05.
Reason: apology and redacted verbiage